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Home >> Lexus >> 2004 >> ES 330 V6-3.3L (3MZ-FE) >> Repair and Diagnosis >> Body and Frame >> Repairs and Inspections Required After a Collision >> Service and Repair >> Air Bag Systems

Air Bag Systems

ON-VEHICLE INSPECTION

CAUTION: Be sure to perform the initialization of the occupant classification ECU under the conditions listed below. If the initialization is not performed, the SRS may not operate properly.
- The occupant classification ECU is replaced.
- Accessories (seatback tray or seat cover, etc.) are installed to the vehicle.
- The passenger seat is removed from the vehicle.
- Both the SRS warning light and passenger airbag ONIOFF indicator light ("OFF") come on.
- The vehicle is brought to the workshop for repair purpose due to the accident or collision.





1. HORN BUTTON ASSEMBLY (VEHICLE NOT INVOLVED IN COLLISION)
(a) Perform a diagnostic system check (See Diagnostic Strategies).
(b) Perform a visual check which includes the following items with the horn button assembly installed in the vehicle:
Cuts, minute cracks or marked discoloration on the horn button assembly top surface and in the grooved portion.





2. HORN BUTTON ASSEMBLY (VEHICLE INVOLVED IN COLLISION AND AIRBAG IS NOT DEPLOYED)
(a) Perform a diagnostic system check (See Diagnostic Strategies).
(b) Perform a visual check which includes the following items with the horn button assembly removed from the vehicle:
- Cuts, minute cracks or marked discoloration on the horn button assembly top surface and in the grooved portion.
- Cracks or other damage in the connectors.
- Deformation of the steering wheel assembly.
- Deformation of the horn button contact plate of the steering wheel assembly.

HINT:





- If the horn button contact plate of the horn button assembly is deformed, never repair it. Always replace the steering wheel assembly with a new one.





- There should be no interference between the horn button assembly and steering wheel assembly, and the clearance should be uniform all the way around when the new horn button assembly is installed on the steering wheel assembly.

CAUTION: For removal and installation procedures of the horn button assembly, be sure to follow the correct procedure.





3. FRONT PASSENGER AIRBAG ASSEMBLY (VEHICLE NOT INVOLVED IN COLLISION)
(a) Perform a diagnostic system check (See Diagnostic Strategies).
(b) Perform a visual check which includes the following items with the front passenger airbag assembly installed in the vehicle:
Cuts, minute cracks or marked discoloration on the instrument panel around the front passenger airbag assembly.





4. FRONT PASSENGER AIRBAG ASSEMBLY (VEHICLE INVOLVED IN COLLISION AND AIRBAG IS NOT DEPLOYED)
(a) Perform a diagnostic system check (See Diagnostic Strategies).
(b) Perform a visual check which includes the following items with the front passenger airbag assembly removed from the vehicle:
- Cuts, minute cracks or marked discoloration on the front passenger airbag assembly.
- Cracks or other damage in the connectors.
- Deformation or cracks on the instrument panel or instrument panel reinforcement.





HINT: If the instrument panel or instrument panel reinforcement is deformed or cracked, never repair it. Always replace it with a new one.

CAUTION: For removal and installation procedures of the front passenger airbag assembly, see "Replacement" on page 60-34, and be sure to follow the correct procedure.





5. FRONT SEAT AIRBAG ASSEMBLY (VEHICLE NOT INVOLVED IN COLLISION)
(a) Perform a diagnostic system check (See Diagnostic Strategies).
(b) Perform a visual check which includes the following items with the front seat airbag assembly installed in the vehicle:
Cuts, minute cracks or marked discoloration on the front seat back assembly around the front seat airbag assembly.





6. FRONT SEAT AIRBAG ASSEMBLY (VEHICLE INVOLVED IN COLLISION AND AIRBAG IS NOT DEPLOYED)
(a) Perform a diagnostic system check (See Diagnostic Strategies).
(b) Perform a visual check which includes the following items with the front seat airbag assembly removed from the vehicle:
- Cuts, minute cracks or marked discoloration on the front seat airbag assembly.
- Cracks or other damage in the wire harness or connector.





7. CURTAIN SHIELD AIRBAG ASSEMBLY (VEHICLE NOT INVOLVED IN COLLISION)
(a) Perform a diagnostic system check (See Diagnostic Strategies).
(b) Perform a visual check which includes the following items with the curtain shield airbag assembly installed in the vehicle:
Cuts, minute cracks or marked discoloration on the front pillar garnish and roof headlining assembly around the curtain shield airbag assembly.





8. CURTAIN SHIELD AIRBAG ASSEMBLY (VEHICLE INVOLVED IN COLLISION AND AIRBAG IS NOT DEPLOYED)
(a) Perform a diagnostic system check (See Diagnostic Strategies).
(b) Perform a visual check which includes the following items with the curtain shield airbag assembly removed from the vehicle:
- Cuts, minute cracks or marked discoloration on the curtain shield airbag assembly.
- Cracks or other damage in the wire harness or connector.
9. AIRBAG SENSOR ASSEMBLY CENTER (VEHICLE NOT INVOLVED IN COLLISION)
(a) Perform a diagnostic system check (See Diagnostic Strategies).
10. AIRBAG SENSOR ASSEMBLY CENTER (VEHICLE INVOLVED IN COLLISION AND AIRBAG IS NOT DEPLOYED)
(a) Perform a diagnostic system check (See Diagnostic Strategies).
11. AIRBAG SENSOR ASSEMBLY CENTER (VEHICLE INVOLVED IN COLLISION AND AIRBAG IS DEPLOYED)
(a) Replace the airbag sensor assembly center.
12. AIR BAG FRONT SENSOR (VEHICLE NOT INVOLVED IN COLLISION)
(a) Perform a diagnostic system check (See Diagnostic Strategies).
13. AIRBAG FRONT SENSOR (VEHICLE INVOLVED IN COLLISION AND AIRBAG IS NOT DEPLOYED)
(a) Perform a diagnostic system check (See Diagnostic Strategies).
(b) When the front bumper of the vehicle or its periphery is damaged, check if there is any damage to the airbag front sensor. If there are any defects as mentioned below, replace the airbag front sensor with a new one:
- Cracks, dents or chips in the case
- Cracks or other damage in the connector
- Peeling off of the label or damage to the serial number
14. AIRBAG FRONT SENSOR (VEHICLE INVOLVED IN COLLISION AND AIRBAG IS DEPLOYED)
(a) Replace the airbag front sensor.
15. SIDE AIRBAG SENSOR ASSEMBLY (VEHICLE NOT INVOLVED IN COLLISION)
(a) Perform a diagnostic system check (See Diagnostic Strategies).
16. SIDE AIRBAG SENSOR ASSEMBLY (VEHICLE INVOLVED IN COLLISION AND AIRBAG IS NOT DEPLOYED)
(a) Perform a diagnostic system check (See Diagnostic Strategies).
(b) When the center pillar of the vehicle or its periphery is damaged, check if there is any damage to the side airbag sensor. If there are any defects as mentioned below, replace the side airbag sensor with a new one:
- Cracks, dents or chips in the case
- Cracks or other damage in the connector
- Peeling off of the label or damage to the serial number
17. SIDE AIRBAG SENSOR ASSEMBLY (VEHICLE INVOLVED IN COLLISION AND AIRBAG IS DEPLOYED)
(a) Replace the side airbag sensor assembly.
18. AIRBAG SENSOR REAR (VEHICLE NOT INVOLVED IN COLLISION)
(a) Perform a diagnostic system check (See Diagnostic Strategies).
19. AIRBAG SENSOR REAR (VEHICLE INVOLVED IN COLLISION AND AIRBAG IS NOT DEPLOYED)
(a) Perform a diagnostic system check (See Diagnostic Strategies).
(b) When the quarter panel of the vehicle or its periphery is damaged, check if there is any damage to the airbag sensor rear. If there are any defects as mentioned below, replace the airbag sensor rear with a new one:
- Cracks, dents or chips in the case
- Cracks or other damage in the connector
- Peeling off of the label or damage to the serial number
20. AIRBAG SENSOR REAR (VEHICLE INVOLVED IN COLLISION AND AIRBAG IS DEPLOYED)
(a) Replace the airbag sensor rear.
21. SEAT POSITION AIRBAG SENSOR (VEHICLE NOT INVOLVED IN COLLISION)
(a) Perform a diagnostic system check (See Diagnostic Strategies).
22. SEAT POSITION AIRBAG SENSOR (VEHICLE INVOLVED IN COLLISION)
(a) Perform a diagnostic system check (See Diagnostic Strategies).
(b) Perform a visual check for damage to the seat position airbag sensor, which includes the following items even if the airbag was not deployed:
- Cracks, dents or chips in the case
- Cracks or other damage in the connector
23. OCCUPANT CLASSIFICATION ECU (VEHICLE NOT INVOLVED IN COLLISION)
(a) Perform a diagnostic system check (See Diagnostic Strategies).
24. OCCUPANT CLASSIFICATION ECU (VEHICLE INVOLVED IN COLLISION)
(a) Perform a diagnostic system check (See Diagnostic Strategies).
(b) Perform a visual check for damage to the occupant classification ECU, which includes the following items even if the airbag was not deployed:
- Cracks, dents or chips in the case Cracks or other damage in the connector
25. WIRE HARNESS AND CONNECTOR (VEHICLE NOT INVOLVED IN COLLISION)
(a) Perform a diagnostic system check (See Diagnostic Strategies).
26. WIRE HARNESS AND CONNECTOR (VEHICLE INVOLVED IN COLLISION)
(a) Perform a diagnostic system check (See Diagnostic Strategies).
(b) Check for breaks in all wires of the SRS wire harness and exposed conductors.
(c) Check to see if the SRS wire harness connectors are cracked or chipped.

HINT: The SRS wire harness is integrated with the engine room main wire, instrument panel wire, floor wire, floor wire No.2 and front seat RH wire.
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