Post-Collision Diagnosis & Repair

POST-COLLISION DIAGNOSIS

To inspect and service the SRS after a collision (whether or not the air bags has deployed), perform the following steps.

1. SRS AIR BAG CONTROL UNIT (SRS-ECU) MEMORY CHECK





(1) Connect the scan tool to the data link connector located at the right side of the junction block.

Caution: Make certain that the ignition switch is at OFF when the scan tool is connected or disconnected.

(2) Read (and write down) all displayed diagnostic trouble codes.

NOTE: If the battery power supply has been disconnected or disrupted by the collision, the scan tool cannot communicate with the SRS control unit. Inspect and, if necessary, repair the body wiring harness before proceeding further.

(3) Read the service data (fault duration and how many times memories are erased) using the scan tool.

NOTE:
- Maximum stored period: 9999 minutes (approximately 7 days)
- Maximum number of times to be stored: 250

(4) Erase the diagnostic trouble codes and after waiting 45 seconds or more read (and write down) all displayed diagnostic trouble codes.

2. REPAIR PROCEDURE

When air bag deploys from collision

(1) Replace the following parts with new ones.
- SRS air bag control unit (SRS-ECU)
- Air bag module

(2) Check the following parts and replace if there are any malfunctions.
- Clock spring
- Steering wheel, steering column and intermediate joint

1) Check wiring harness (built into steering wheel) and connectors for damage, and terminals for deformation.
2) Install air bag module to check fit or alignment with steering wheel.
3) Check steering wheel for noise, binding or difficult operation, or excessive free play.

(3) Check harnesses for binding, connectors for damage, poor connections, and terminals for deformities.

When air bag does not deploy in low-speed collision

Check the SRS components.
If the SRS components are showing any visible damage such as dents, cracks, or deformation, replace them with new ones.