2001priuseEWD

MEMO

2001 PRIUS (EWD414U)

TOYOTA HYBRID SYSTEM

H10 C , H11 A , H12 B , H13 E , H14 D

HYBRID VEHICLE CONTROL ECU

ST2 IGSW ST1– STP CCS GND1 GND2
6E 31 D 24 D
7E 2D 1 D 16 D

B–W R–W B–W B–Y G–W W–B W–B
B–W B–W S3 L
R–W STOP LIGHT SW
7 AM2 IG2 6
ST2 8 5 2B
W–R
11 2G 4

2 2C I15 B–W
IGNITION SW
FROM STOP LIGHT
J24 A , J25 B CA CA 3 SW
JUNCTION
1 2G CONNECTOR

W–R B–W BB

9 1J 3 1J B–W

15A 5 1 6 ID1 L
AM2 2 B–W
IG2
2 1B RELAY 5
CCS
3

CRUISE

2 1A 3 1K

RES/ACC

B–W
W–B

B 14 IK1 SET/COAST

1C B–W W3 CANCEL
1D WATER PUMP MOTOR
F12 C , F13 D 2 (INVERTER) ECC
M 4 C14
FUSIBLE
LINK 1 CRUISE CONTROL SW
BLOCK [COMB. SW]
NO. 1

B–G W–B W–B
W–B
W–B

1 W–B AB AB AB
F18 E5 AA
120A MAIN FUSIBLE J18 A , J19 B
LINK BLOCK W–B JUNCTION
NO. 2 CONNECTOR

BATTERY AA

W–B W–B
W–B

A
J17
JUNCTION
CONNECTOR

IG

2001 PRIUS (EWD414U)

* 1 : SHIELDED

H10 C , H11 A , H12 B , H13 E , H14 D

HYBRID VEHICLE CONTROL ECU

VCP1 VPA1 EP1 VCP2 VPA2 EP2 PNDBR VSFT SFT GSFT EOM
12 E 11 E 21 E 5E
13 D 14 D 12 D 23 D 15 D 22 D 15 E 13 E 23 E 22 E 14 E

Y
G
L
B
W
R
L–R
L–W
L–B
LG–R
R–B
W
B
R
W–B

W–BI4 E J21
(* 1) E JUNCTION
CONNECTOR
I2
R–B W–B
Y L–R L–W L–B LG–R (* 1) B R W–B
G
L W
B
W
R

65 342 1 25674 983 J22 A , J23 B
VCP1 VPA1 EP1 VCP2 VPA2 EP2 JUNCTION CONNECTOR
W–B DB
W–B E AE A

A13 1 P1
ACCEL POSITION SENSOR
PARK/NEUTRAL
POSITION SW
W–B

W–B

J24 A , J25 B AB
JUNCTION
CONNECTOR AA
W–B
AA

W–B

W–B 8 2D

8 2K W–B

W–B A W–B
J11
JUNCTION
CONNECTOR

ID

2001 PRIUS (EWD414U)

TOYOTA HYBRID SYSTEM

H10 C , H11 A , H12 B , H13 E , H14 D

HYBRID VEHICLE CONTROL ECU

GSNG GSN GRF GRFG GCS GCSG GMTG GMT MSNG MSN
11 C 8C 1C
4C 10 C 17 C 5C 12 C 20 C 13 C

G
R
(* 1)
B
W
Y
BR
G–W
B–R
G
R

I8

W–B (* 1)

W–B
W–B
(* 1)
G
R
B
W
Y
BR
G–W
B–R
(* 1)
G
R
(* 1)
I8

7A 2A 1A 6A 3A 8A 9A 4A 5B 2B
GSNG GSN GRF GRFG GCS GCSG GMTG GMT MSNG MSN

3 1K M2 A M3 B , M4 C
1 1A
MOTOR GENERATOR MOTOR GENERATOR
NO. 1 NO. 2

W–B
W–B
W–B

BA BA BA
CB
J8 A , J9 B
JUNCTION
CONNECTOR

CB

W–B
W–B

W–B W–B
W–B
W–B
W–B

2001 PRIUS (EWD414U)

* 1 : SHIELDED

H10 C , H11 A , H12 B , H13 E , H14 D

HYBRID VEHICLE CONTROL ECU

MCS MCSG MRF MRFG MMTG MMT ETH+ ETH– HTE+ HTE– ESTP SPDO GO
14 C 18 C 9C 19 D 29 D 8 D 6 D 10 B
21 C 19 C 2C 28 D 27 D

P (* 1)
L PP
(* 1) LL
B (* 1)
W YY
R–W BR BR
GR R–Y R–Y
OO
GG
9 IA2
I8

(* 1) W–B

(* 1) 28 C 27 C 19 C 18 C 16 C 10 C 21 C
ETH+ ETH– HTE+ HTE– ESTP SPHV GO

(* 1) E 9 C , E10 D
I8 ENGINE CONTROL MODULE

P MPX1 MPX2
L 14 D 13 D
B
3B W6B1B4B3C1C GR–L G1
MCS R–WMCSGMRFMRFGMMTGMMT GATEWAY ECU
GR
W–B GR
(* 1)
(* 1)

M3 B , M4 C BB J18 11 16 B8
B MPD2 MPX– BODY ECU
MOTOR GENERATOR JUNCTION
NO. 2 CONNECTOR MPD1 MPX+
4 15
W–B

GR–B A7
A/C AMPLIFIER
4
MP2+ GR–B
MPX+
11GR GR–B
GR
W–B W–BA
W–B J17 W–B
W–B JUNCTION W–B
W–B CONNECTOR

IG

2001 PRIUS (EWD414U)

TOYOTA HYBRID SYSTEM

MSIV MSDN MIT H10 C , H11 A , H12 B , H13 E , H14 D MIWA GIVA GIVB GIWB GIWA
21 A 13 A 11 A HYBRID VEHICLE CONTROL ECU 25 A 19 A 8 A 18 A 28 A
MWU MUU MVU MIVG MIVA MIVB MIWB VB
6 A 4 A 5 A 26 A 16 A 7 A 17 A 20 A

G
(* 1)

Y
L
G
R
W
B
(* 1)
B
W
G
Y
R
(* 1)
B
W
G
R

(* 1)

(* 1)
W–B (* 1)
W–B (* 1)
W–B (* 1)

G
Y
W–B L
G
R
W
B
B
W
G
Y
R
B
W
G
R
7C 4D 5D 3D 1D 2D 6D 1C 3C 4C 5C 2C 1B 3B 4B 2B

M–SINV M–SDOWN M–INVT M–WU M–UU M–VU M–GINV M–IVA M–IVB M–IWB VB M–IWA G–IVA G–IVB G–IWB G–IWA

I 9 D , I10 C , I11 A , I12 B , I13 E , I14 F
INVERTER

GND
6B

AAAA J7
AAA
JUNCTION
CONNECTOR

GR–B GR–B
GR GR

W–B W–B J1
W–B JUNCTION
CONNECTOR
W–B A
A A W–B

IE EC

2001 PRIUS (EWD414U)

H10 C , H11 A , H12 B , H13 E , H14 D

HYBRID VEHICLE CONTROL ECU

GSDN G1T GWU GVU GUU GIVG MFIV GSIV GFIV ILK NODD +B1 +B2
12 A 23 A 3 A 2 A 1 A 27 A 4D 5D
14 A 15 A 24 A 4E 4B

Y
L
G
W
R
B
B
G
B
O
L–O
W–G
W–G
FROM POWER SOURCE SYSTEM
10 IF1 (SEE PAGE 50)

12 IA1 13 IA1

I17 100A DC/DC
INTERLOCK SW F10
FUSIBLE LINK
O BLOCK NO. 1

5A DC/DC–S
F17
FUSIBLE LINK
BLOCK NO. 2

W–G
W–G
1
12
W–G
I9

2

V–R W
B–R
W–G
W–G

(* 1)

4 IH1 2 IH1

Y
L
G
W
R
B
B
G
B
V–R
L–O
B–R

4A 5A 3A 2A 1A 6A 8C 7B 8B 6C 4A 1B 3A 1A
M–FINV G–SINV G–FINV CVRSW IGCT
G–SDOWN G–INVT G–WU G–VU G–UU G–GINV NODD AMD S

I 9 D , I10 C , I11 A , I12 B , I13 E , I14 F C4 A , C5 B
INVERTER
CONVERTER
CEI CBI IGCT
IDH

1F 1E 5B 2A

* 1 : SHIELDED O 14 IE1
* 2 : HIGH VOLTAGE (273. 6V) (* 2)
O
(* 2)
W–G
YY

GR–B O(* 2)
GR O(* 2)
GR–B
GR

Y 10
IDH
A7
A/C
AMPLIFIER

2001 PRIUS (EWD414U)

TOYOTA HYBRID SYSTEM

H10 C , H11 A , H12 B , H13 E , H14 D
HYBRID VEHICLE CONTROL ECU

FROM POWER SOURCE SYSTEM (SEE PAGE 50) SPDI GB 1B
8B 26 D 25 D

V–W

10A 15A 19 IE1
GAUGE DOME
V–W R–W
7 1J B–L
GG
5 2A AB

W–G L V–W J27 A , J28 B W–G
L L–Y JUNCTION I9
CONNECTOR

2 2G 7 2B

4 2A 6 2A
21 A
L C10 A , C11 B W–G
CHARGECOMBINATION METER
22 A 13 A OUTPUT
CONTROL
CRUISE

1 IH1 10 IB1 6 IB1

14 A GR–B
GR
W–R
R–W
B–L
2B 3B

O(* 2) BR L L O(* 2)
O(* 2) W–B O(* 2)
GR–B W–B
GR W–B

7 2A W–R
6 2B R–W
B–L

22 A 2A 17 A 16 A

IH BJ B17 A , B18 B
BATTERY ECU

2001 PRIUS (EWD414U)

H10 C , H11 A , H12 B , H13 E , H14 D
HYBRID VEHICLE CONTROL ECU

HTD+ HTD– DTH+ DTH– CON1 CON2 CON3
2E 20 E 19 E 18 E 13 B 2B 1E

* 1 : SHIELDED VV GR GR
* 2 : HIGH VOLTAGE (273. 6V) PP

WW 8 IH1 9 IH1 11 IF1
BB
RR
GG
(* 1) (* 1)
W–G W–G
1 IF2 2 IF2 4 IF2 3 IF2 5 IF2
S 8 A , S 9 B , S10 C
S11 D , S12 E 3A 4A 5A
SYSTEM MAIN RELAY
1A 1B 1C 7A 2A 6A 1D 1EW–B

O(* 2) O(* 2) Y Y–B
Y–R

B2 O(* 2)
O(* 2)
W–B

W–B W–B
J32 A , J33 B
CA CA JUNCTION
CONNECTOR
BB BB

W–B W–B

O(* 2)
O(* 2)

W–B

W
B
R
G
Y
Y–B
Y–R

6A 7A 18 A 19 A 4 B 10 B 3 B

B17 A , B18 B
BATTERY ECU

2001 PRIUS (EWD414U)

TOYOTA HYBRID SYSTEM

H10 C , H11 A , H12 B , H13 E , H14 D
HYBRID VEHICLE CONTROL ECU

AS1G AS1 HTB+ HTB– BTH+ BTH– WFSE HAO HAI TC SIL
14 B 15 B 20 D 30 D 18 D 17 D 21 D
9 D 9 E 10 E 10 D

C3 BR–B G–R P
CIRCUIT BREAKER SENSOR Y
Y–R
P–B
W–L

1 LG CE
2 V J16
W–G G JUNCTION
R CONNECTOR

24 16 14 22 B11 P CE W–L
HVI+ HVI– HVO+ HVO– BRAKE ECU Y
Y–R 2 ID1 1 ID1
G–R 10 ID1 P–B P–B P–B

W W–G
W
E W W
J26
15 12 8 JUNCTION 7 W–B
WFSE OP2 OP3 CONNECTOR SIL

E

D2
DATA LINK
13 CONNECTOR 3

TC

O(* 2)
O(* 2)
W–B

O
(* 2)
O
(* 2)
H16 A , H17 B
1A HYBRID VEHICLE 1B
BATTERY

SERVICE PLUG
OO
(* 2) (*2)

HYBRID VEHICLE BATTERY HYBRID VEHICLE BATTERY SENSOR
BUSBER MODULE BUSBER MODULE

GR–B
V–Y
GR

O
LG–B
L–O

LG
P
Y–B
L–W
L
LG–R
Y
P–L
G
L–R
G–W
R
W
L–B
L
L
B
B
W

14 2 15 3 16 4 17 5 18 6 7 20 8 21 9 22 10 23 11 24 12345

B17 A , B18 B
BATTERY ECU

2001 PRIUS (EWD414U)

FROM POWER SOURCE SYSTEM (SEE PAGE 50)

H10 C , H11 A , H12 B , H13 E , H14 D 20A 10A
HYBRID VEHICLE CONTROL ECU HV BATT FAN

ABFS FCVC BATT MREL 11 1F 8 1J
3D 7B
3E 7D

G–Y

L A18 O
AIRBAG SENSOR G–Y
ASSEMBLY 4 IA1 L–R L–R

23 B–W8 T4 7 IH1
GSW2 HEVC TRANSPONDER
W–G KEY COMPUTER
W LG–R
W G–Y 1

W–B W–G B19 3
BATTERY FAN
AAJ22 A , J23 B AA BB 22 RELAY
JUNCTION 13
CONNECTOR 25
WW 25
G–Y 22 W–B L
G–Y
B15
J2 A , J3 B BATTERY BLOWER MOTOR
JUNCTION
CONNECTOR L
W–B
G–Y

IGCT RELAY
G–Y
CB BA BA

3 IF1 L
1

M
2

L–B L–B

H16 A , H17 B

HYBRID VEHICLE
BATTERY

W
G–Y

L
L–B

SENSOR 5 IH1 34
* 2 : HIGH VOLTAGE (273. 6V)
B16
BATTERY
MOTOR
BLOWER
CONTROLLER

21

W–B J7
JUNCTION
W LG–R L–R L–B CONNECTORA
R W–B A
R W–B A
G
G IE
W
G–Y

6 7 8 9 10 8A 1A 8B 9B 2B B J32
B JUNCTION
CONNECTOR J1
JUNCTION
W–B CONNECTOR

W–B

B17 A , B18 B BI
BATTERY ECU

2001 PRIUS (EWD414U)

TOYOTA HYBRID SYSTEM

SYSTEM OUTLINE
FEATURES OF TOYOTA HYBRID SYSTEM
This system controls the following modes in order to achieve the most efficient operations to match the driving conditions.

(1) Supply of electrical power from the HV battery to motor generator no.2 provides force to drive the wheels.
(2) While the tires are driven by the engine via the planetary gears, motor generator no.1 is driven via the planetary gears to

supply electricity to motor generator no.2 to drive the wheels.
(3) When the vehicle is decelerating, kinetic energy from the wheels is recovered and converted into electrical energy and

used to recharge the HV battery by means of motor generator no.2.
The hybrid vehicle control ECU switches between these modes (1, 2, 1+2, or 3) according to the driving conditions.
However, when the state of charge of the HV battery is low, the HV battery is charged by the engine by turning motor
generator no.1.
CRUISE CONTROL OPERATION
Cruise control is the speed control device, which sets the desired speed by just operating the switch on the control panel
without pressing the accelerator pedal. This device is used when you would like to drive the vehicle at the fixed speed.
1. SET CONTROL
If you operate the SET/COAST switch when driving (The available range of set speed: between about 40 and 200 km/h) with
the main switch is ON (When power indicator comes on), the device memorizes vehicle’s speed when switch is off and
controls the fixed speed.
2. SET SPEED CONTROL
This device compares the vehicle’s running speed and the memorized speed, and controls the driving power of the motor
and the engine by calculating the cruise control requirements so that both speed become equivalent.
3. COAST CONTROL
If the SET/COAST switch is continued to be ON during the running with the cruise control, the device recognizes the cruise
control requirement is at 0 and decelerates the vehicle’s speed. Then the device memorizes the speed when the switch is off
in order to control the fixed speed.
In each time you operate SET/COAST switch momentarily (For about 0.5 second), the memorized speed is decreased in
about 1.5 km/h. However, in case of the tap–down operation with more than 5–km/h gap between the memorized speed and
vehicle’s running speed, the device memorizes the vehicle’s speed when the switch is off and controls the fixed speed.
4. ACCEL CONTROL
If the RESUME/ACCEL switch is continued to be ON during the running with the cruise control, the device recognizes the
cruise control is on the acceleration side and accelerates the vehicle’s speed. Then the running speed when the switch is off
is memorized to control the fixed speed.
In each time you operate RESUME/ACCEL switch momentarily (For about 0.5 second), the memorized speed is increased
in about 1.5 km/h. However, if there is more than 5–km/h gap between the memorized speed and vehicle’s running speed,
this operation does not change the memorized speed. (Tap–up operation is not available.)
5. RESUME CONTROL
If the running speed is faster than the low speed limit after the cruise control is canceled manually, the fixed speed is
controlled by the OFF–ON operation of RESUME/ACCEL switch, so that the vehicle’s speed returns to the memorized
speed at the time the cruise control is released.

2001 PRIUS (EWD414U)

6. MANUAL CANCEL CONTROL
When each of the following signals is input during driving with cruise control, the cruise control is released with turning the
cruise control requirement to 0. (The memorized speed is maintained when following signals except the signal, main switch
OFF is input.)
∗ Stop light switch ON (Pressing the brake pedal)
∗ Control switch’s cancel switch ON
∗ Main switch OFF

7. AUTO CANCEL FUNCTION

A) The memorized speed is erased and the control is canceled if the following conditions occur. The power indicator blinks
at that time until the main switch is turned ON. The speed control is unavailable unless the main switch is turned ON
again.

∗ When the stop light switch breaks or short–circuits.
∗ When sudden change of the running speed signal occur.

B) The memorized speed is erased and the control is canceled if the following conditions occur.
∗ When the malfunction of the stop light switch input circuit occurs.
∗ When the running speed becomes slower than 40km/h.
∗ When the running speed becomes slower than the speed that 16 km/h subtracted from the memorized speed.

8. REGENERATIVE SYSTEM OPERATION
This system operates the motor as a generator to change the kinetic energy of the vehicle into the electricity when accel
pedal release or foot braking controls the vehicle, and store the electricity in the battery.

SERVICE HINTS

C14 CRUISE CONTROL SW [COMB. SW]
5–4 : Approx. 1540 Ω with CANCEL SW on
Approx. 240 Ω with RES/ACC SW on
Approx. 630 Ω with SET/COAST SW on

: PARTS LOCATION

Code See Page Code See Page Code See Page
A7 H10 C J18 A
A13 36 H11 A 37 J19 B 37
A18 36 H12 B 37 37
B8 36 H13 E 37 J21 37
B11 36 H14 D 37 J22 A 37
B15 36 H16 A 37 J23 B 37
B16 38 H17 B 38 J24 A 37
38 38 J25 B 37
B17 A 38 I9 D 35 37
B18 B 38 I10 C 35 J26 37
38 I11 A 35 J27 A 37
B19 34 I12 B 35 J28 B 38
C3 34 I13 E 35 38
C4 A 34 I14 F 35 J32 38
C5 B 36 37 A 35
C10 A 36 I15 38 35
C11 B 36 I17 37 J33 B 35
C14 36 J1 37 M2 A 37
D2 36 J2 A 37 M3 B 37
E9 C 36 J3 B 37 M4 C 39
E10 D 34 J7 37 39
F10 34 J8 A 37 P1 39
F12 C 34 J9 B 37 S3 39
F13 D 38 J11 37 S8 A 39
F17 38 J16 37 S9 B 37
F18 37 J17 37 S10 C 35
G1 J18 S11 D
S12 E
T4
W3

2001 PRIUS (EWD414U)

TOYOTA HYBRID SYSTEM

: RELAY BLOCKS

Code See Page Relay Blocks (Relay Block Location)

2 23 Engine Room R/B No.2 (Right Side of Reserve Tank)
,,,,,,,,, : JUNCTION BLOCK AND WIRE HARNESS CONNECTOR

Code See Page Junction Block and Wire Harness (Connector Location)

1A 27 Engine Wire and Engine Room J/B (Engine Compartment Left)

1B

1F Engine Room Main Wire and Engine Room J/B (Engine Compartment Left)
27

1J

1K

2A

2B Instrument Panel Wire and Instrument Panel J/B (Cowl Side Panel LH)
30

2C

2D

2G 31 Engine Room Main Wire and Instrument Panel J/B (Cowl Side Panel LH)

2K 31 Cowl Wire and Instrument Panel J/B (Cowl Side Panel LH)

: CONNECTOR JOINING WIRE HARNESS AND WIRE HARNESS

Code See Page Joining Wire Harness and Wire Harness (Connector Location)
IA1
IA2 42 Engine Room Main Wire and Cowl Wire (Cowl Side Panel LH)
IB1
ID1 42 Floor Wire and Cowl Wire (Cowl Side Panel LH)
IE1 42 Instrument Panel Wire and Cowl Wire (Left Kick Panel)
IF1 42 Instrument Panel Wire and Engine Room Main Wire (Left Kick Panel)
IF2
IH1 42 Instrument Panel Wire and Floor Wire (Left Kick Panel)
IK1
42 Floor Wire and Engine Room Main Wire (Left Kick Panel)
44 Engine Wire and Engine Room Main Wire (Right Kick Panel)

: GROUND POINTS

Code See Page Ground Points Location
EC 40 Engine Compartment Left
ID
IE 42 Cowl Side Panel LH
IG
IH 42 Cowl Side Panel RH
BI 42 Right Kick Panel
BJ 46 Left Side of Rear Pillar
46 Right Side of Rear Pillar

: SPLICE POINTS

Code See Page Wire Harness with Splice Points Code See Page Wire Harness with Splice Points
E5 40 Engine Room Main Wire I8 44 Engine Wire
I2 44 Instrument Panel Wire I9 44 Engine Room Main Wire
I4 44 Cowl Wire B2 46 Floor Wire

2001 PRIUS (EWD414U)

MEMO

2001 PRIUS (EWD414U)

ENGINE CONTROL

B–W B
B–W B–W

B–W

7 AM2 IG2 6
ST2
W–R
B–W

W–B
I15 FROM POWER SOURCE SYSTEM (SEE PAGE 50)
IGNITION SW
15A
EFI

2 2C 5 2B

1 2G 11 2G

9 1J W–R 25
B–W EFI
15A B–W RELAY
AM2
3 1J 2 1A 13
2 1B
1C 5 1 51
1D 2
IG2 CIR OPN
1 RELAY RELAY

3

32

3 1K 12 1F 1 1F 10 1A 13 1F 3 1A 4 1A

B–G B G–R R–W
F12 C , F13 D B–R G–R
FUSIBLE LINK G–R
BLOCK NO. 1 G–R
B
B

4 IA2 14 IA1

W–B

J7 AA J18 F16 B BB BB19 IA1
JUNCTION AA JUNCTION FUEL PUMP J4 A , J5 B
120A MAIN CONNECTOR CONNECTOR CA CA
F18 B–R 3 JUNCTION CONNECTOR
FUSIBLE LINK
BLOCK NO. 2 M
AB

7

W–B B

W–B 8 BC1 W–B B
W–B

J1 AA
BATTERY JUNCTION W–B J17 W–B
CONNECTOR JUNCTION
A

CONNECTOR

IE BL IG EA

2001 PRIUS (EWD414U)

G–R B
G–R B–W
B–W
B W–B
B
CA
R–W BATT FC MREL +B 9D
G–R 3 B 9 B 25 C 4 B IGSW BB
G–R B–W B–W
BB 11 A Y–G
IGT1 J24 A , J25 B
B R–L JUNCTION
V2 CONNECTOR
VSV (EVAP)
B–W
M1 32 14 B–W
B MASS AIR FLOW METER W–B E4
I7 I7 B R–B
25 A B–R B–R W–B E3
(* 1) IGF B–R
G EVP1 I7
1 432 29 A I1 W–B
BR R IGNITION COIL AND
2 12 A IGNITER NO. 1
(* 1) 15 IGT2
W B–W
B BR W 32 14 E4
E1
2001 PRIUS (EWD414U) B ENGINE COOLANT TEMP. SENSOR THA E 7 A , E 8 B , E 9 C , E10 D B–R B–R W–B W–B B–W
I7 22 B ENGINE CONTROL MODULE I7 E3
Y–B I2
* 1 : SHIELDED O1 VG 13 A IGNITION COIL AND
OIL PRESSURE SW 10 B IGT3 IGNITER NO. 2

G B–W
32 14 E4
EVG
19 B

B–R B–R W–B W–B B–W
I7 Y E3
I3

IGNITION COIL AND
IGNITER NO. 3

2 14 A 32 14 B–W B–W
1 IGT4 E4
BR THW
I7 14 B

B–R W–B

1 MOPS 5B I4
12 B # 10 IGNITION COIL AND
BR IGNITER NO. 4
B
B Y B–W
(* 1) 1 B
2 B–W
E4
I5
INJECTOR NO. 1

ENGINE CONTROL

B E4 B–W E4 B–W E4 B–W BB
B–W AB AB

CA J4 A , J5 B
JUNCTION
B–W CONNECTOR
B–W
B–W B B

1 N1
NOISE FILTER
(IGNITION) 5 BC1 1 BC1 T2
B–R B THROTTLE
111 V6 CONTROL MOTOR
I6 VSV (PARGE FLOW SWITCHING VALVE)
INJECTOR NO. 2 12
I7 LB
INJECTOR NO. 3 V5
I8 VSV (CANISTER CLOSED VALVE)
INJECTOR NO. 4 22

222

11

B–R (* 1) L
L–W P
R–W

2 BC1 6 BC1

B–R
L

6B 1A 2A 11 C 13 C 7A 8A 30 A
# 20 # 30 # 40 TBP CCV M– M+ GE01

E 7 A , E 8 B , E 9 C , E10 D
ENGINE CONTROL MODULE

HCLS VC PTNK VTA VTA2
14 C 2B 22 C 23 B 21 B

V–W

Y–R L–R L–R BR
BR T3
THROTTLE POSITION SENSOR
9 IO1 Y–R Y–R
(* 1)
15 IO1 P

V–W Y–R 3 BC1 7 BC1 4 BC1 BR L 123
Y–R VC VTA1 VTA2
2 CA CA CA V1 J8 A , J9 B BR
VACUUM SENSOR JUNCTION E2
(HC ADSORBER AND CONNECTOR 3 2 1 4
CATALYST SYSTEM) VCC PTNK E2
Y–R BR
13 BB I7

BR Y–R V4
BR VAPOR PRESSURE SENSOR
BR I7 BR
I7 BR B

B

BB
(*1) (*1)

(* 1)

2001 PRIUS (EWD414U)

FROM POWER SOURCE SYSTEM (SEE PAGE 50)
G–W

* 1 : SHIELDED

EAG–W 15A
DB J14 A , J15 B STOP
JUNCTION
H12 B , H14 D CONNECTOR 9 2K
HYBRID VEHICLE CONTROL ECU 2
1D
STP G–W R–B
S3
FROM FAN NO. 1 AND GO SPDO HTE– HTE+ ETH+ ETH1 ESTP STOP LIGHT SW
FAN NO. 2 RELAY 10 B 6D 29 D 19 D 28 D 27 D 8D
TO COMBINATION
METER 21 R–Y
GG O Y L
W–G (* 1) (* 1)
C2
CAMSHAFT TIMING OIL BR P
CONTROL VALVE
1
9 IA2

LG (* 1)
V–W (* 1)
Y–R
W–G

4A 5D 23 A 24 A 21 C 10 C 18 C 19 C 28 C 27 C 16 C
FAN SPD OCV+ OCV– GO SPHV HTE– HTE+ ETH+ ETH– ESTP

E 7 A , E 8 B , E 9 C , E10 D
ENGINE CONTROL MODULE

E2 HCC HT1A OX1A E11 OX1B HT1B
18 B 20 C 1D 12 D 16 D 11 D 7D

BR P–L P–L BR
B–W WW I6
BR
BR (* 1)

BR
1 IE1 2 IE1 22 IE1 I6 J22 A , J23 B
JUNCTION
6 IO1 CONNECTOR

V3 B–W EB EB EB BR
VSV (HC ADSORBER AND (* 1)
CATALYST SYSTEM) 2 7 IK1 6 IK1 1 IK1 G–Y
Y
P–L DA 431 H9
W HEATED OXYGEN SENSOR
1 13 H3 (BANK 1 SENSOR 2)
HEATED OXYGEN SENSOR
BR (BANK 1 SENSOR 1) (* 1)

B

BR 2
I7
4 2
B B
BR B
B I7
(* 1) 12 IE1
(* 1) B

(* 1)
(* 1)

2001 PRIUS (EWD414U)

ENGINE CONTROL P–B
W–L
FROM POWER SOURCE SYSTEM (SEE PAGE 50)

15A
THRO

8 1A

GR GR A8 P–B G–R
A/C AMPLIFIER W–L GR–L

NE ACT CE
45 J16
JUNCTION
CONNECTOR

CE

LG P–B G–R
P–G W–L GR–L

GR

(* 1) 6A 3D 22 D 6C 8C 6D 14 D (* 1)
(* 1) +BM NEO ACT TC SIL W MPX1 (* 1)

KNK1 13 D
28 A MPX2

1 EA1 E 7 A , E 8 B , E 9 C , E10 D
1 ENGINE CONTROL MODULE

(* 1) G2 NE– NE+ E1 E01 E02 E03 ME01
(* 1) 10 A 24 B 16 B 17 B 21 A 31 A 3A 9A
I7
(* 1)

K 1 (* 1) R BR
KNOCK SENSOR (* 1) W–B
G W–B
BB R W–B
W–B

I7C1 1
1 CAMSHAFT POSITION (* 1)
2 SENSOR I7
(* 1)
G I7
G
2
(* 1)
G AA AA AA AA
J8 A , J9 B
C6 JUNCTION
CRANKSHAFT POSITION CONNECTOR
SENSOR
G BR
(* 1) BR
(* 1) BR
BR BR
W–B
W–B
W–B
W–B
AB AB AB

EB EA

2001 PRIUS (EWD414U)

FROM POWER SOURCE SYSTEM (SEE PAGE 50)

* 1 : SHIELDED

7. 5A 10A
OBDII GAUGE

P–B 9 2D 5 2A
W–L
1 ID1 2 ID1 W–L BR L L
G–R
GR–L 16 B8 AAW E D
MPX– BODY ECU AA J22 A E D
GR GR–L JUNCTION
MPX+ CONNECTOR
(* 1) 15
(* 1) P–B
J26
JUNCTION
CONNECTOR

W–L
J26
JUNCTION
CONNECTOR

W
P–B
W–L
G–R

GR–B C10 A , C11 B
COMBINATION METER
G1 11 7 13 16 4B 22 A
GATEWAY ECU MPD2 SIL TC BAT
MPD1 SG
(* 1) 4 D2 CG 5 MALFUNCTION
W–B (*1) 4 INDICATOR LAMP
4 DATA LINK 14 ID2
BB MP2+ CONNECTOR 3 W–B
MPX+
J18 B 11 GR–B BR BR
JUNCTION
CONNECTOR J24 A AA 3B 2B 2B

A7 JUNCTION GR
A/C AMPLIFIER CONNECTOR GR–B
GR
AA

W–B

8 2D

8 2K

W–B 7 2A
6 2B

W–B W–B 14 IO1
BR BR EB
A A
J17 J11 IH
JUNCTION JUNCTION
CONNECTOR CONNECTOR

IG ID

2001 PRIUS (EWD414U)

ENGINE CONTROL

SYSTEM OUTLINE
This system utilizes an engine control module and maintains overall control of the engine, transmission and so on. An outline
of the engine control is explained here.

1. INPUT SIGNALS
(1) Engine coolant temp. signal circuit
The engine coolant temp. sensor detects the engine coolant temp. and has a built–in thermistor with a resistance which
varies according to the engine coolant temp. thus the engine coolant temp. is input in the form of a control signal into
TERMINAL THW of the engine control module.
(2) Intake air temp. signal circuit
The intake air temp. sensor is installed in the mass air flow meter and detects the intake air temp., which is input as a
control signal into TERMINAL THA of the engine control module.
(3) Oxygen sensor signal circuit
The oxygen density in the exhaust gases is detected and input as a control signal into TERMINALS OX1A and OX1B of
the engine control module.
(4) RPM signal circuit
Camshaft position and crankshaft position are detected by the camshaft position sensor and crankshaft position sensor.
Camshaft position is input as a control signal to TERMINAL G2 of the engine control module, and engine RPM is input
into TERMINAL NE+.
(5) Throttle signal circuit
The throttle position sensor detects the throttle valve opening angle, which is input as a control signal into TERMINALS
VTA and VTA2 of the engine control module.
(6) Vehicle speed signal circuit
The vehicle speed signal from brake ECU, detects the vehicle speed and inputs a control signal into TERMINAL SPD of
the engine control module via the combination meter.
(7) Battery signal circuit
Voltage is constantly applied to TERMINAL BATT of the engine control module. When the ignition SW is turned on, the
voltage for engine control module start–up power supply is applied to TERMINAL +B of the engine control module via
EFI relay.
(8) Engine knock signal circuit
Engine knocking is detected by knock sensor and the signal is input into TERMINAL KNK1 of the engine control module
as a control signal.

2. CONTROL SYSTEM
∗ SFI system
The SFI system monitors the engine condition through the signals, which are input from each sensor to the engine
control module. The best fuel injection volume is decided based on this data and the program memorized by the engine
control module, and the control signal is output to TERMINALS #10, #20, #30 and #40 of the engine control module to
operate the injector. (Inject the fuel). The SFI system produces control of fuel injection operation by the engine control
module in response to the driving conditions.
∗ ESA system
The ESA system monitors the engine condition through the signals, which are input to the engine control module from
each sensor. The best ignition timing is detected according to this data and the memorized data in the engine control
module, and the control signal is output to TERMINALS IGT1, IGT2, IGT3 and IGT4. This signal controls the ignition coil
and igniter to provide the best ignition timing for the driving conditions.
∗ Fuel pump control system
The engine control module operation outputs to TERMINAL FC and controls the CIR OPN relay. Thus controls the fuel
pump drive speed in response to conditions.

3. DIAGNOSIS SYSTEM
With the diagnosis system, when there is a malfunctioning in the engine control module signal system, the malfunction
system is recorded in the memory. The malfunctioning system can then be found by reading the display (Code) of the
malfunction indicator lamp.

4. FAIL–SAFE SYSTEM
When a malfunction occurs in any system, if there is a possibility of engine trouble being caused by continued control based
on the signals from that system, the fail–safe system either controls the system by using data (Standard values) recorded in
the engine control module memory or else stops the engine.

2001 PRIUS (EWD414U)

SERVICE HINTS

E7 (A), E8 (B), E9 (C), E10 (D) ENGINE CONTROL MODULE

BATT–E1 : Always approx. 9–14 volts
+B–E1 : 9–14 volts with the ignition SW on and the engine stopping
VC–E2 : 4.5–5.5 volts with the ignition SW on and the engine stopping
IGF–E1 : Pulse generation with the engine idling

THA–E2 : 0.5–3.4 volts with the engine idling and the intake air temp. 20°C (68°F)
THW–E2 : 0.2–1.0 volts with the engine idling and the engine coolant temp. 80°C (176°F)

W–E1 : 9–14 volts with the engine idling
: 0–3 volts with the ignition SW on and the engine coolant temp. sensor connector disconnects

ESTP–E1 : 9–14 volts with the brake pedal depressed
FC–E01 : 9–14 volts with the ignition SW on and the engine stopping
: 0–3 volts with the engine idling
+BM–E1 : Always approx. 9–14 volts

MREL–E1 : 9–14 volts with the ignition SW on and the engine stopping
EVP1–E1 : 9–14 volts with the ignition SW on and the engine stopping
HT1A, HT1B : 9–14 volts with the ignition SW on and the engine stopping

TC–E1 : 9–14 volts with the ignition SW on and the engine stopping
KNK1–E2 : Pulse generation with the engine idling
NE+, G2–NE– : Pulse generation with the engine idling
OCV+ –OCV– : Pulse generation with the ignition SW on and the engine stopping
IGT1, IGT2, IGT3, IGT4–E1 : Pulse generation with the engine idling

#10, #20, #30, #40–E01 : Pulse generation with the engine idling
E01, E02, E03, E1, E2, ME01–GROUND : Always continuity

E1 ENGINE COOLANT TEMP. SENSOR
2–1 : Approx. 14.96 kΩ (–20 °C, –4 °F)
Approx. 2.44 kΩ (20 °C, 68 °F)
Approx. 0.31 kΩ (80 °C, 176 °F)
Approx. 0.14 kΩ (110 °C, 230 °F)

: PARTS LOCATION

Code See Page Code See Page Code See Page
A7 H12 B J17
A8 36 H14 D 37 J18 37
B8 36 37 J22 A 37
C1 36 I1 35 J23 B 37
C2 34 I2 35 J24 A 37
C6 34 I3 35 J25 B 37
34 I4 35 J26 37
C10 A 36 I5 35 K1 37
C11 B 36 I6 35 M1 35
36 I7 35 N1 35
D2 34 I8 35 O1 35
E1 36 I15 37 S3 35
E7 A 36 J1 37 T2 37
E8 B 36 J4 A 37 T3 35
E9 C 36 J5 B 37 V1 35
E10 D 34 J7 37 V2 35
F12 C 34 J8 A 37 V3 35
F13 D 38 J9 B 37 V4 35
F16 38 J11 37 V5 39
F18 37 J14 A 37 V6 39
G1 34 J15 B 37 39
H3 37 J16 37
H9

2001 PRIUS (EWD414U)

ENGINE CONTROL

,,,,,,,,, : JUNCTION BLOCK AND WIRE HARNESS CONNECTOR

Code See Page Junction Block and Wire Harness (Connector Location)

1A 27 Engine Wire and Engine Room J/B (Engine Compartment Left)

1B

1F Engine Room Main Wire and Engine Room J/B (Engine Compartment Left)
1J 27

1K

2A

2B Instrument Panel Wire and Instrument Panel J/B (Cowl Side Panel LH)
30

2C

2D

2G 31 Engine Room Main Wire and Instrument Panel J/B (Cowl Side Panel LH)

2K 31 Cowl Wire and Instrument Panel J/B (Cowl Side Panel LH)

: CONNECTOR JOINING WIRE HARNESS AND WIRE HARNESS

Code See Page Joining Wire Harness and Wire Harness (Connector Location)
EA1 40 Engine Wire and Engine No.4 Wire (Near the Radiator Fan)
IA1
IA2 42 Engine Room Main Wire and Cowl Wire (Cowl Side Panel LH)
ID1
ID2 42 Instrument Panel Wire and Cowl Wire (Left Kick Panel)
IE1
IK1 42 Instrument Panel Wire and Engine Room Main Wire (Left Kick Panel)
IO1 44 Engine Wire and Engine Room Main Wire (Right Kick Panel)
BC1 44 Engine Wire and Cowl Wire (Right Kick Panel)
46 Cowl Wire and Fuel Tank Wire (Near the Fuel Tank)

: GROUND POINTS

Code See Page Ground Points Location
EA 40 Engine Block
EB
ID 42 Cowl Side Panel LH
IE 42 Cowl Side Panel RH
IG 42 Right Kick Panel
IH 46 Near the Fuel Tank
BL

: SPLICE POINTS

Code See Page Wire Harness with Splice Points Code See Page Wire Harness with Splice Points
E3 40 Engine Wire I6 44 Instrument Panel Wire
E4 I7 44 Engine Wire

2001 PRIUS (EWD414U)

MEMO

2001 PRIUS (EWD414U)

HYBRID VEHICLE IMMOBILISER SYSTEM

FROM POWER SOURCE SYSTEM (SEE PAGE 50)

7 AM2 IG2 6 7. 5A
ST2 ECU–B

W–R B–W

I15 5 2C
IGNITION SW

2 2C CA J24 A R–G
1 2G CA
JUNCTION FA J27 A , J28 B D2 H14
CONNECTOR JUNCTION DATA LINK HYBRID VEHICLE
CONNECTOR CONNECTOR 3 CONTROL ECU
HB
OP1 FCVC
W–R B–W R–G 11 7

9 1J 8 ID1 B–R10 ID2 8
HEVC
15A 11 ID2 R–GA 3
AM2 J20 D
2 JUNCTION B–W
2 1B IG CONNECTOR
B–W R–G B–R
A

1
+B

B

1C F12 C , F13 D IND CTY KSW T4 GND
1D FUSIBLE LINK 5 6 7 12
BLOCK NO. 1 TRANSPONDER KEY
1 8 ID2 LG–B FB COMPUTER AW–B
R–WDA J10
LG–B JUNCTION
6 L–B CONNECTOR

B W–B A
J20

C7 JUNCTION
CENTER CONNECTOR
CLUSTER SW
B–G J12 A , J13 B B 8 2K
JUNCTION
4 CONNECTOR L–B L–B W–B

LG–B 8 2D

120A MAIN F18 9 ID1
FUSIBLE LINK
BLOCK NO. 2 R3 B , R4 C R–W W–B
RADIO AND PLAYER
BR
8C
7B EB LG–B 3 IB1 DB J27 A , J28 B AA J24 A , J25 B
AA J27 A , J28 B 1 BA JUNCTION JUNCTION
IF JUNCTION CONNECTOR AB CONNECTOR
CONNECTOR R–W 2
D6 1L–B U1 AAW–B
DOOR COURTESY UNLOCK WARNING SW J11
BATTERY SW FRONT LH JUNCTIONW–BW–B
BR CONNECTOR

ID

2001 PRIUS (EWD414U)

SERVICE HINTS
T4 TRANSPONDER KEY COMPUTER

1–GROUND : Always approx. 12 volts
12–GROUND : Always continuity

U1 UNLOCK WARNING SW
1–2 : Closed with the ignition key in cylinder

: PARTS LOCATION

Code See Page Code See Page Code See Page

C7 36 I15 37 J25 B 37
37
D2 36 J10 37 J27 A 37
37
D6 38 J11 37 J28 B 37
37
F12 C 34 J12 A 37 R3 B 37

F13 D 34 J13 B 37 R4 C

F18 38 J20 37 T4

H14 37 J24 A 37 U1
,,,,,,,,, : JUNCTION BLOCK AND WIRE HARNESS CONNECTOR

Code See Page Junction Block and Wire Harness (Connector Location)

1B Engine Room Main Wire and Engine Room J/B (Engine Compartment Left)
27

1J

2C Instrument Panel Wire and Instrument Panel J/B (Cowl Side Panel LH)
2D 30

2G 31 Engine Room Main Wire and Instrument Panel J/B (Cowl Side Panel LH)

2K 31 Cowl Wire and Instrument Panel J/B (Cowl Side Panel LH)

: CONNECTOR JOINING WIRE HARNESS AND WIRE HARNESS

Code See Page Joining Wire Harness and Wire Harness (Connector Location)
IB1 42 Floor Wire and Cowl Wire (Cowl Side Panel LH)
ID1
ID2 42 Instrument Panel Wire and Cowl Wire (Left Kick Panel)

: GROUND POINTS

Code See Page Ground Points Location
ID 42 Cowl Side Panel LH
IF 42 Left Kick Panel

2001 PRIUS (EWD414U)

HEADLIGHT (w/ DAYTIME RUNNING LIGHT)

FROM POWER SOURCE SYSTEM (SEE PAGE 50)
11

2 5

30A 7. 5A DRL
HEAD DRL RELAY

2 2 13
3 3333
14
HEAD R–L R–W
RELAY R–G

23 W–B
4
DIM
RELAY

1

32
3 1E 8 1F

10A R–G 6 R–G
HEAD LO (LH) L IA2 L
10A
HEAD LO (RH) 17
10A IA2
HEAD HI (LH)
10A
HEAD HI (RH)

6 1F 7 1F 2 1E 5 1E

R R–G
R–Y
R–W
G–R

R–B 9 R–B
E 2 IA1

R–G
R–B

3 3
21
H2 H1

HEADLIGHT HEADLIGHT
RH LH

21

G–R
R–Y
R–W

R

W–B

A
J1
JUNCTION
CONNECTOR

IE

2001 PRIUS (EWD414U)

FROM POWER SOURCE SYSTEM (SEE PAGE 50)

7. 5A 10A 15A
ECU–B GAUGE DOME

5 2C 10 2K 7 1J

R–W FA R–G R–G
16 IA2 HB J27 A , J28 B8 ID1
JUNCTION
R–G R–G CONNECTORA
R–GA

R–L
L–Y

R–W C
J20
JUNCTION
CONNECTOR

C

R–G
R–L

L 46 D3 3 12
DIM H–LP DAYTIME RUNNING LIGHT RELAY +B IG
1 D5
DIODE DRL H HI PKB CHG– E IND
(DAYTIME 1 7 8 11 92 5
RUNNING
LIGHT) R–G
L–Y
2

R–B

R–G R–W J12 A , J13 B Y–B 7 2I 2 2G
W–B JUNCTION CONNECTOR W–B

EE R–G L–O R–Y 10 2A 4 2A
E R–G
EB
E J20 HIGH BEAM
JUNCTION L17 21
CONNECTOR
7 ID2 HEAD
L
R–G EA
1 C10
87 R–Y Y–B COMBINATION METER

3 ID2 LIGHT OFF
CONTROL SW TAIL
R–W HEAD P2
LOW PARKING
B8 A , B9 B DIMMER SW HIGH BRAKE SW 14
2 B BODY ECU FLASH
HRLY
13
L

H RDY 16 C13 7 2A
17 B 9A COMBINATION SW

R Y–B W–B
BR
6 2B

5 ID2 A J11
R J17 JUNCTION
JUNCTION CONNECTOR
CONNECTOR IH
ID
IG

2001 PRIUS (EWD414U)

HEADLIGHT (w/ DAYTIME RUNNING LIGHT)

SYSTEM OUTLINE
When the ignition SW is turned on ST position and ”READY” signal from engine control module is sent to the daytime
running light relay via body ECU. If the parking brake pedal is depressed (Parking brake SW is on) at that time, the daytime
running light system does not operate. If the parking brake pedal is released (Parking brake SW is off), the daytime running
light system operates and the low beam headlight comes on.

SERVICE HINTS

HEAD RELAY
1–2 : Closed with the light control SW at HEAD position or the dimmer SW at FLASH position
Closed with the engine running and the parking brake lever is released (Parking brake SW off)

D3 DAYTIME RUNNING LIGHT RELAY
12–GROUND : Approx. 12 volts with the ignition SW at ON position

3–GROUND : Always approx. 12 volts
11–GROUND : Continuity with the parking brake lever pulled up
2–GROUND : Always continuity
8–GROUND : Continuity with the dimmer SW at HIGH or FLASH position

: PARTS LOCATION

Code See Page Code See Page Code See Page
B8 A H1 J17
B9 B 36 H2 34 J20 37
36 J1 34 J27 A 37
C10 36 J11 37 J28 B 37
C13 36 37 P2 37
D3 36 J12 A 37 37
D5 36 J13 B 37

: RELAY BLOCKS

Code See Page Relay Blocks (Relay Block Location)

3 24 Engine Room R/B No.3 (Engine Compartment Right)
,,,,,,,,, : JUNCTION BLOCK AND WIRE HARNESS CONNECTOR

Code See Page Junction Block and Wire Harness (Connector Location)

1E

1F 27 Engine Room Main Wire and Engine Room J/B (Engine Compartment Left)

1J

2A

2B 30 Instrument Panel Wire and Instrument Panel J/B (Cowl Side Panel LH)

2C

2G 31 Engine Room Main Wire and Instrument Panel J/B (Cowl Side Panel LH)

2I Cowl Wire and Instrument Panel J/B (Cowl Side Panel LH)
31

2K

: CONNECTOR JOINING WIRE HARNESS AND WIRE HARNESS

Code See Page Joining Wire Harness and Wire Harness (Connector Location)
IA1 42 Engine Room Main Wire and Cowl Wire (Cowl Side Panel LH)
IA2 42 Instrument Panel Wire and Cowl Wire (Left Kick Panel)
ID1
ID2

: GROUND POINTS

Code See Page Ground Points Location
ID
IE 42 Cowl Side Panel LH
IG 42 Cowl Side Panel RH
IH 42 Right Kick Panel

2001 PRIUS (EWD414U)

: SPLICE POINTS

Code See Page Wire Harness with Splice Points Code See Page Wire Harness with Splice Points
E2 40 Engine Room Main Wire

2001 PRIUS (EWD414U)

HEADLIGHT (w/o DAYTIME RUNNING LIGHT)

2 41 1 10A 10A
HEAD
SHORT HEAD SHORT HEAD (RH)
PIN RELAY PIN (LH)
1 32 7 1F
4
1 1B 8 1F
6 1F

R–W J4 A , J5 B
R–G JUNCTION CONNECTOR

R–W6 IA2 H1 3 H2 R–L 3
21 R–G 21
J20 HEADLIGHT HEADLIGHT
JUNCTION LH RH
E CONNECTOR
B R–G
E R–W
R–Y
E
J4 A , J5 B
R–W JUNCTION CONNECTORFA FA EB
R–Y R–Y
3 ID2 R–G

DB EA EA

R–W

1C F12 C , F13 D B9 2 7 IA1 3 IA1
1D FUSIBLE LINK BODY ECU HRLY
BLOCK NO. 1 R–Y
1 H R–G
17
BATTERY
L

R R–G

B–G

5 ID2

R J12 A , J13 BFA FA
R–W JUNCTION CONNECTOR
R–Y R–G
R–G

F18 120A MAIN 13LIGHT 8 7 17
FUSIBLE LINK OFFCONTROL SW 16
BLOCK NO. 2 DB
TAIL
DIMMER SW 7 2I
HEAD 10 2A

LOW W–B

HIGH

FLASH
C13
COMBINATION
SW

L

A
J17
JUNCTION
CONNECTOR

IG

2001 PRIUS (EWD414U)

FROM POWER SOURCE SYSTEM (SEE PAGE 50)

15A
DOME

7 1J

2 2GHIGH BEAMHEAD
4 2AL L L–Y
L

17 21

C10
COMBINATION METER

L14
7 2A
BR6 2B

IH

2001 PRIUS (EWD414U)

HEADLIGHT (w/o DAYTIME RUNNING LIGHT)

SERVICE HINTS
HEAD RELAY

1–2 : Closed with the light control SW at HEAD position or the dimmer SW at FLASH position

C13 COMBINATION SW
13–16 : Continuity with the light control SW at HEAD position

8–16 : Continuity with the dimmer SW at FLASH position
7–16 : Continuity with the dimmer SW at HIGH or FLASH position

: PARTS LOCATION

Code See Page Code See Page Code See Page

B9 36 F18 38 J12 A 37
37
C10 36 H1 34 J13 B 37
37
C13 36 H2 34 J17

F12 C 34 J4 A 37 J20

F13 D 34 J5 B 37
,,,,,,,,, : JUNCTION BLOCK AND WIRE HARNESS CONNECTOR

Code See Page Junction Block and Wire Harness (Connector Location)

1B

1F 27 Engine Room Main Wire and Engine Room J/B (Engine Compartment Left)

1J

2A Instrument Panel Wire and Instrument Panel J/B (Cowl Side Panel LH)
30

2B

2G 31 Engine Room Main Wire and Instrument Panel J/B (Cowl Side Panel LH)

2I 31 Cowl Wire and Instrument Panel J/B (Cowl Side Panel LH)

: CONNECTOR JOINING WIRE HARNESS AND WIRE HARNESS

Code See Page Joining Wire Harness and Wire Harness (Connector Location)
IA1 42 Engine Room Main Wire and Cowl Wire (Cowl Side Panel LH)
IA2 42 Instrument Panel Wire and Cowl Wire (Left Kick Panel)
ID2

: GROUND POINTS

Code See Page Ground Points Location
IG 42 Cowl Side Panel RH
IH 42 Right Kick Panel

2001 PRIUS (EWD414U)

MEMO

2001 PRIUS (EWD414U)

TAILLIGHT

15 7. 5A
TAIL
TAIL
RELAY

23

1 2H 6 2K 7 2J 5 2F 5 2L

W G
LG LG
G2 ID210 IA1
G
J4 A , J5 B G

JUNCTION CONNECTOR
DF
AB

11 B9 DF
TRLY AB
BODY
T ECU
18

1B LG–R F5
1D FRONT SIDE MARKER LIGHT LH
F11 B , F13 D 6 ID2 W–B G F3
FUSIBLE LINK 1 F4 FRONT PARKING LIGHT LH
BLOCK NO. 1 LG–R FRONT PARKING LIGHT RH W–B G
W–B G F6
100A DC/DC FRONT SIDE MARKER LIGHT RH
W–B G
B–G 21 12
12 21

F18 C13 14 W–B W–B E1
FUSIBLE LINK LIGHT CONTROL SW OFF E1 E1
BLOCK NO. 2 [COMB. SW] TAIL
HEAD
120A MAIN

16

W–B

W–B A
J7
JUNCTION
CONNECTOR

A

BATTERY

W–B

A A
J17 J1
JUNCTION JUNCTION
CONNECTOR CONNECTOR

IG IE

2001 PRIUS (EWD414U)

G

AA
G

W–B W–B BA CB L2 16 G AA J32 A , J33 B
BI LICENSE PLATE LIGHT LH 11 G JUNCTION CONNECTOR
W–B J32 A , J33 B W–B G
W–B 22 G AA
JUNCTION R6 5
CONNECTOR TAILLIGHT LH G
[REAR COMB. LIGHT LH] G
2001 PRIUS (EWD414U) CB AA
W–B
BK AA
L3
LICENSE PLATE LIGHT RH

R7
TAILLIGHT RH
[REAR COMB. LIGHT RH]

16 AB G
5 AA

TAILLIGHT

SERVICE HINTS
TAIL RELAY

5–3 : Closed with the light control SW at TAIL or HEAD position

: PARTS LOCATION

Code See Page Code See Page Code See Page

B9 36 F13 D 34 J32 A 38
38
C13 36 F18 38 J33 B 38
38
F3 34 J1 37 L2 39
39
F4 34 J4 A 37 L3

F5 34 J5 B 37 R6

F6 34 J7 37 R7

F11 B 34 J17 37
,,,,,,,,, : JUNCTION BLOCK AND WIRE HARNESS CONNECTOR

Code See Page Junction Block and Wire Harness (Connector Location)

2F Engine Room Main Wire and Instrument Panel J/B (Cowl Side Panel LH)
31

2H

2J Cowl Wire and Instrument Panel J/B (Cowl Side Panel LH)
31

2K

2L 31 Floor Wire and Instrument Panel J/B (Cowl Side Panel LH)

: CONNECTOR JOINING WIRE HARNESS AND WIRE HARNESS

Code See Page Joining Wire Harness and Wire Harness (Connector Location)
IA1 42 Engine Room Main Wire and Cowl Wire (Cowl Side Panel LH)
ID2 42 Instrument Panel Wire and Cowl Wire (Left Kick Panel)

: GROUND POINTS

Code See Page Ground Points Location
IE 42 Cowl Side Panel LH
IG 42 Cowl Side Panel RH
BI 46 Left Side of Rear Pillar
BK 46 Back Panel Center

: SPLICE POINTS

Code See Page Wire Harness with Splice Points Code See Page Wire Harness with Splice Points
E1 40 Engine Room Main Wire

2001 PRIUS (EWD414U)

MEMO

2001 PRIUS (EWD414U)

F18 F11 B , F13 D ILLUMINATION
FUSIBLE LINK FUSIBLE LINK
BLOCK NO. 2 BLOCK NO. 1 1 2H

120A MAIN 100A DC/DC
1B W
1D LG LG

1
B–G

BATTERY C13

LIGHT CONTROL SW
[COMB. SW]

14 LG–R 6 ID2 LG–R 11 2 ID2 15
OFF TRLY
TAIL TAIL
HEAD T RELAY
18 23

A W–B 16 B9 6 2K
J17
2001 PRIUS (EWD414U) JUNCTION BODY
CONNECTOR ECU

IG

W–L LG

A22
ASHTRAY ILLUMINATION
22 5A
W–L 11 LG PANEL

1 2D

C9
CIGARETTE LIGHTER ILLUMINATION

BR BR LG

M7
MULTI DISPLAY
LG
LG
LG
LG

8
6

W–L
W–L

IF

W–L LG
W–L LG
LG
W–L LGLG

HA

FB

5

2

W–L J21 H7
HAZARD WARNING SW
J21 B JUNCTION
B CONNECTOR LG
JUNCTION HA
CONNECTOR W–L FBW–L LG
LG
B W–L 10 B LG
5A
L–Y
A
A

A

W–L R2 A , R3 B
RADIO AND PLAYER
J21
LG
JUNCTION HA
CONNECTOR FB

W–L C W–L 5
W–L C 10
W–L
2001 PRIUS (EWD414U) CCC C7
CENTER CLUSTER SW

W–L HALG
W–B J27 A , J28 B
EA W–BDB E W–B JUNCTION
E CONNECTOR
J22 A , J23 B J21
W–B JUNCTION JUNCTION FB
CONNECTOR CONNECTOR
4
T

E TC ILL–
635

LG–R L1

LIGHT CONTROL
RHEOSTAT

W–B FROM POWER SOURCE SYSTEM (SEE PAGE 50)
A
A 15A
DOME
8 2D
8 2K J24 7 1J

JUNCTION
CONNECTOR

A W–B W–B 2 2G
J11 4 2A
JUNCTION W–L 21 AL
CONNECTOR
BR L 6 2B 7 2A 6 B 7 B 14 A
ID IH

C10 A , C11 B
COMBINATION METER

ILLUMINATION

SERVICE HINTS
TAIL RELAY

5–3 : Closed with the light control SW at TAIL or HEAD position

C13 COMBINATION SW
14–16 : Closed with the light control SW at TAIL or HEAD position

: PARTS LOCATION

Code See Page Code See Page Code See Page

A22 36 F13 D 34 J24 37
37
B9 36 F18 38 J27 A 37
37
C7 36 H7 37 J28 B 37
37
C9 36 J11 37 L1 37

C10 A 36 J17 37 M7

C11 B 36 J21 37 R2 A

C13 36 J22 A 37 R3 B

F11 B 34 J23 B 37
,,,,,,,,, : JUNCTION BLOCK AND WIRE HARNESS CONNECTOR

Code See Page Junction Block and Wire Harness (Connector Location)

1J 27 Engine Room Main Wire and Engine Room J/B (Engine Compartment Left)

2A

2B 30 Instrument Panel Wire and Instrument Panel J/B (Cowl Side Panel LH)

2D

2G Engine Room Main Wire and Instrument Panel J/B (Cowl Side Panel LH)
31

2H

2K 31 Cowl Wire and Instrument Panel J/B (Cowl Side Panel LH)

: CONNECTOR JOINING WIRE HARNESS AND WIRE HARNESS

Code See Page Joining Wire Harness and Wire Harness (Connector Location)
ID2 42 Instrument Panel Wire and Cowl Wire (Left Kick Panel)

: GROUND POINTS

Code See Page Ground Points Location
ID 42 Cowl Side Panel LH
IF 42 Left Kick Panel
IG 42 Cowl Side Panel RH
IH 42 Right Kick Panel

2001 PRIUS (EWD414U)

MEMO

2001 PRIUS (EWD414U)

TURN SIGNAL AND HAZARD WARNING LIGHT W–B

FROM POWER SOURCE SYSTEM (SEE PAGE 50) 12 2J

10A 10A 3 2F
TURN–HAZ GAUGE
11
6 1J 10 2K W–B 22
H7
HAZARD SW 3 A
[HAZARD WARNING SW] A
WW R–L R–L
6 IA1 J20 4G–R A G–B
JUNCTION C G–B
CONNECTOR A
C J1
4 ID1 JUNCTION
CONNECTOR
G–R
IE
4 1 8 3 4 2K
B IG HAZ LL
T5
EL TURN SIGNAL FLASHER RELAY E LR
5 ER 7 2

6

L–B W–B G–Y G–Y G–B
W–B
F8 G–Y F7
B FRONT TURN SIGNAL LIGHT RH FRONT TURN SIGNAL LIGHT LH
J12 A , J13 B BA BA
JUNCTION CONNECTOR BB
13

LH C13
TURN SIGNAL SW

RH [COMB. SW]

2

G–Y

W–B W–B

W–B A J18 11 IA1 J7
A JUNCTION JUNCTION
CONNECTOR A CONNECTOR
A J4
G–Y JUNCTION
CONNECTOR

A

W–B W–B

G–Y

A
J17
JUNCTION
CONNECTOR

IG

2001 PRIUS (EWD414U)

W–B

DB J22 A , J23 B C10
EA
JUNCTION TURN SIGNAL INDICATOR LIGHT
CONNECTOR [COMB. METER]

W–B LH RH
19 18
A 14
J24
JUNCTION
CONNECTOR

A

W–B L
L
L

8 2D 2 2A 1 2A 7 2A

8 2K 5 2M 3 2M 6 2B

G–B G–Y BR

R6 33 R7
REAR TURN SIGNAL LIGHT LH55 REAR TURN SIGNAL LIGHT RH
[REAR COMB. LIGHT LH] [REAR COMB. LIGHT RH]
W–B
W–B

CB J32 A , J33 B W–B
BA BR
JUNCTION
CONNECTOR

W–B

A BI BK IH
J11
JUNCTION
CONNECTOR

ID

2001 PRIUS (EWD414U)

TURN SIGNAL AND HAZARD WARNING LIGHT

SERVICE HINTS
T5 TURN SIGNAL FLASHER RELAY

1–GROUND : Approx. 12 volts with the ignition SW at ON position
4–GROUND : Always approx. 12 volts
2, 3–GROUND : Changes from approx. 12 to 0 volts with the ignition SW at ON position and

the turn signal SW at LEFT or RIGHT position or the hazard SW at ON position
5–GROUND : Continuity with the ignition SW at ON position and the turn signal SW at LEFT position
6–GROUND : Continuity with the ignition SW at ON position and the turn signal SW at RIGHT position
8–GROUND : Continuity with the hazard SW at ON position
7–GROUND : Always continuity

: PARTS LOCATION

Code See Page Code See Page Code See Page

C10 36 J11 37 J24 37
38
C13 36 J12 A 37 J32 A 38
39
F7 34 J13 B 37 J33 B 39
37
F8 34 J17 37 R6

H7 37 J18 37 R7

J1 37 J20 37 T5

J4 37 J22 A 37

J7 37 J23 B 37
,,,,,,,,, : JUNCTION BLOCK AND WIRE HARNESS CONNECTOR

Code See Page Junction Block and Wire Harness (Connector Location)

1J 27 Engine Room Main Wire and Engine Room J/B (Engine Compartment Left)

2A

2B 30 Instrument Panel Wire and Instrument Panel J/B (Cowl Side Panel LH)

2D

2F 31 Engine Room Main Wire and Instrument Panel J/B (Cowl Side Panel LH)

2J Cowl Wire and Instrument Panel J/B (Cowl Side Panel LH)
31

2K

2M 31 Floor Wire and Instrument Panel J/B (Cowl Side Panel LH)

: CONNECTOR JOINING WIRE HARNESS AND WIRE HARNESS

Code See Page Joining Wire Harness and Wire Harness (Connector Location)
IA1 42 Engine Room Main Wire and Cowl Wire (Cowl Side Panel LH)
ID1 42 Instrument Panel Wire and Cowl Wire (Left Kick Panel)

: GROUND POINTS

Code See Page Ground Points Location
ID
IE 42 Cowl Side Panel LH
IG
IH 42 Cowl Side Panel RH
BI 42 Right Kick Panel
BK 46 Left Side of Rear Pillar
46 Back Panel Center

2001 PRIUS (EWD414U)

MEMO

2001 PRIUS (EWD414U)

STOP LIGHT R–B

FROM POWER SOURCE SYSTEM (SEE PAGE 50)G–W

15AG–W
STOP

9 2K

2
S3
STOP LIGHT
SW

1

E
J14
JUNCTION
CONNECTOR

E

9 IB1

G–W

CA CA
AB
J30 A , J31 B

JUNCTION
CONNECTOR

AB

G–W H15 G–W R7
HIGH MOUNTED STOP LIGHT STOP LIGHT RH
R6 2 [REAR COMB. LIGHT RH]2
STOP LIGHT LH 1 5
[REAR COMB. LIGHT LH] G–W
2
5

W–B W–B

CB CB

BA J32 A , J33 B W–B

JUNCTION
CONNECTOR

W–B

W–B
BI BK

2001 PRIUS (EWD414U)

SERVICE HINTS
S3 STOP LIGHT SW

2–1 : Closed with the brake pedal depressed

: PARTS LOCATION

Code See Page Code See Page Code See Page
R6
H15 38 J31 B 38 R7 39
S3 39
J14 37 J32 A 38 37

J30 A 38 J33 B 38
,,,,,,,,, : JUNCTION BLOCK AND WIRE HARNESS CONNECTOR

Code See Page Junction Block and Wire Harness (Connector Location)

2K 31 Cowl Wire and Instrument Panel J/B (Cowl Side Panel LH)

: CONNECTOR JOINING WIRE HARNESS AND WIRE HARNESS

Code See Page Joining Wire Harness and Wire Harness (Connector Location)
IB1 42 Floor Wire and Cowl Wire (Cowl Side Panel LH)

: GROUND POINTS

Code See Page Ground Points Location
BI 46 Left Side of Rear Pillar
BK 46 Back Panel Center

2001 PRIUS (EWD414U)

7 2A BACK–UP LIGHT
6 2B
FROM POWER SOURCE SYSTEM (SEE PAGE 50)
IH
BR L 10AR–L
GR GAUGER–BR–L
B8 W–G
BODY ECU 3 2CR–B

13 D 2B 31J27 A , J28 B
MPX2 B5JUNCTION
15 BACK–UP LIGHTCONNECTOR
MPX+ RELAYR–B
MPX– R–B
16 52
E 9 C , E10 D GR–B
ENGINE CONTROL MODULE L
G1 A7 14 A 1 B
GATEWAY ECU A/C AMPLIFIER

14 D GR–B C10 A , C11 B
MPX1 GR–L 11 GR COMBINATION
MPX+ METER
MP2+
4 3B

4
MPD1
MPD2
11

(SHIELDED) H13 E , H14 D
Y
HYBRID VEHICLE
CONTROL ECU

19 C HTE+
HTE+ 19 D

2001 PRIUS (EWD414U) 18 C P1
HTE– PARK/NEUTRAL
POSITION SW

BR R–B
14 E BA BA W–B
RL 1

HTE– E BB
29 D 4

E R–B

IG ID BI CONNECTOR JUNCTION J17 J11 AA W–B 8 2D J24 J22

J18 B CB JUNCTION JUNCTION
JUNCTION CONNECTOR CONNECTOR
CONNECTOR 8 2K
B W–B 4 W–B W–B
W–B A
BA
CONNECTOR JUNCTION A
5
J32 A , J33 B R6 J30 A , J31 B

BACK–UP LIGHT LH
[REAR COMB. LIGHT LH]

JUNCTION CONNECTOR JUNCTION CONNECTOR 9 IF1 DA DA
BB
W–B W–B R–B R–B

R7 N2
NAVIGATION ECU
BACK–UP LIGHT RH
[REAR COMB. LIGHT RH] R–B

W–B R–B
4 5 IJ1
5 14
REV
BK