MECHANICAL ENGINEERING DEPARTMENT POLITEKNIK KUCHING SARAWAK DJA40052 – AUTOMOTIVE WORKSHOP PRACTICE 3 93 8. AIRBAG SENSOR ASSEMBLY The airbag sensor assembly is mounted on the floor inside the front console box. The airbag sensor assembly consists of an airbag sensor, saving sensor, diagnosis circuit, ignition control, drive circuit, etc. It receives signals from the airbag sensor, front airbag sensor, side and curtain shield airbag sensor assembly, curtain shield airbag sensor assembly and judges whether the SRS must be activated or not. The airbag sensor assembly cannot be disassembled. 9. FRONT AIRBAG SENSOR The front airbag sensor is mounted on each of the radiator side supports. The front airbag sensor consists of a frontal deceleration sensor, diagnosis circuit, etc. These send signals to the airbag sensor assembly. The front airbag sensor cannot be disassembled. 10. SIDE AND CURTAIN SHIELD AIRBAG SENSOR ASSEMBLY The side and curtain shield airbag sensor assembly are mounted in the LH and RH center pillars. The side and curtain shield airbag sensor assembly consist of a lateral deceleration sensor, saving sensor, diagnosis circuit, etc. These send signals to the airbag sensor assembly to judge whether the SRS side airbag and curtain shield airbag must be activated or not. The side and curtain shield airbag sensor assembly cannot be disassembled.
MECHANICAL ENGINEERING DEPARTMENT POLITEKNIK KUCHING SARAWAK DJA40052 – AUTOMOTIVE WORKSHOP PRACTICE 3 94 11. CURTAIN SHIELD AIRBAG SENSOR ASSEMBLY The curtain shield airbag sensor assembly is mounted in the LH and RH rear pillars. The curtain shield airbag sensor assembly consists of a lateral deceleration sensor, saving sensor, diagnosis circuit, etc. These sensors send signals to the airbag sensor assembly to judge whether the SRS curtain shield airbag must be activated or not. The curtain shield airbag sensor assembly cannot be disassembled. 12. SEAT POSITION SENSOR ASSEMBLY The seat position sensor assembly is mounted on the seat rail of the driver’s seat. The sensor unit consists of a magnet sensor, diagnosis circuit, etc. It judges the seat sliding position and sends the signal to the airbag sensor assembly. The seat position sensor assembly cannot be disassembled. INSPECTION: CURTAIN SHIELD AIRBAG ASSEMBLY Vehicle not involved in collision: INSPECT SUPPLEMENTAL RESTRAINT SYSTEM (a) Do a diagnostic system check (b) Do a visual check which includes the following items with the curtain shield airbag assembly installed in the vehicle. Check cuts, minute cracks or marked discoloration on the front pillar garnish and roof headlining.
MECHANICAL ENGINEERING DEPARTMENT POLITEKNIK KUCHING SARAWAK DJA40052 – AUTOMOTIVE WORKSHOP PRACTICE 3 95 INSTALL CURTAIN SHIELD AIRBAG SENSOR ASSEMBLY 1. Install the curtain shield airbag sensor assembly with the2 bolts. Torque: 17.5 Nm. (178 kgf·cm, 13 ft·lbf) 2. Connect the connector. NOTICE: • Connection of the connector is done after the sensor assembly has been installed. • Make sure that the sensor assembly is installed with the specified torque. • If the sensor assembly has been dropped, or there are cracks, dents or other defects in the case, bracket or connector, replace the sensor assembly with a new one. • When installing the sensor assembly, take care that the SRS wiring does not interfere with other parts and is not pinched between other parts. • After installation, shake the sensor assembly to check that there is no looseness.
MECHANICAL ENGINEERING DEPARTMENT POLITEKNIK KUCHING SARAWAK DJA40052 – AUTOMOTIVE WORKSHOP PRACTICE 3 96 INSTALL: FRONT AIRBAG SENSOR ASSEMBLY 1. Install the front airbag sensor with the arrow on the sensor facing toward the front of the vehicle. Torque: 7.5 Nm. (76 kgf·cm, 66 in.·lbf) NOTICE: • If the sensor has been dropped, or there are cracks, dents or other defects in the case, brackets or connector, replace the removed sensor with a new one. • The front sensor is equipped with an electrical connection check mechanism. Be sure to lock this mechanism securely when connecting the connector. If the connector is not securely locked, a malfunction code will be detected by the diagnostic system. 2. Connect the front airbag sensor connector. 3. Install battery and battery carrier. 4. Inspect SRS warning light
MECHANICAL ENGINEERING DEPARTMENT POLITEKNIK KUCHING SARAWAK DJA40052 – AUTOMOTIVE WORKSHOP PRACTICE 3 97 REMOVE FRONT AIRBAG SENSOR LH 1. Remove the battery carrier and battery. 2. Disconnect the front airbag sensor connector. NOTICE: Disconnect the connector with sensor assembly installed. 3. Pull the windshield washer tank opening as shown in the illustration. 4. Remove the 2 bolts and front airbag sensor LH. REMOVE FRONT AIRBAG SENSOR RH 1. Disconnect the front airbag sensor connector. NOTICE: Disconnect the connector with sensor assembly installed. 2. Remove the 2 bolts and front airbag sensor RH.
MECHANICAL ENGINEERING DEPARTMENT POLITEKNIK KUCHING SARAWAK DJA40052 – AUTOMOTIVE WORKSHOP PRACTICE 3 98 6.0 Results/Data No. Item Reading / Condition 1 Scan Tools Check Ok/NOT OK 2 Steering Wheel Pad (With Airbag) OK/NOT OK 3 SRS airbag warning light OK/NOT OK 4 Seat Belt Latch OK/NOT OK 5 Curtain shield airbag sensor OK/NOT OK 6 Front airbag sensor OK/NOT OK 7.0 Discussion 2. What are the conditions of the ABS after running all the testing and servicing? 3. How Do You Reset the SRS Light? 4. How Do You Reset the SRS Light? 8.0 Conclusion and Recommendation Your conclusion should be related to your practical and theoretical understanding of the related topic. 9.0 References 1. Automotive Technology: Principles, Diagnosis, and Service, Third Edition • By James D. Halderman• ©2009 Pearson Education, Inc. 2. https://www.academia.edu/36863521/Anti_lock_Braking_System_ABS_A UTOMOTIVE_SYSTEMS 3. https://www.theengineerspost.com/anti-lock-braking-system