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.





SRS Diagnosis Unit Memory Check

1. Connect the scan tool to the data link connector then check diagnosis codes.

Caution:
Make certain that the ignition switch is 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 diagnosis unit. Inspect and, if necessary, repair the body wiring harness before proceeding further.

3. Read the service data (fault duration and how many times the memory was 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, then wait 45 seconds or more, read and write down all displayed diagnostic trouble codes.

Repair Procedure

When Air Bag Deploys In A Collision.

1. Replace the following parts with new ones.

- Front impact sensors
- SRS diagnosis unit (SDU)
- Air bag modules
- Clock spring
- Steering wheel, steering column and intermediate joint.

2. Check harnesses for binding, connectors for damage, poor connections, and terminals for deformation.

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. Concerning parts removed for inspection, replacement with new parts and cautionary points for working, refer to appropriate COMPONENT SERVICE.





Front Impact Sensors

1. Check front upper frame inner, shield plate for deformation or rust.
2. Check front impact sensor for dents, cracks deformation or rust.
3. Check sensor harnesses for binds, connectors for damage, and terminals for deformation.





SRS Diagnosis Unit (SDU)

1. Check SDU case and brackets for dents, cracks or deformation.





2. Check connectors and lock lever for damage, and terminals for deformation.









Air Bag Module

1. Check pad cover for dents, cracks or deformation.









2. Check for connector damage, deformed terminal, and binding harness.
3. Check air bag inflator case for dents, cracks or deformation.
4. Install air bag module to steering wheel to check fit or alignment with the wheel.





Clock Spring

1. Check clock spring connectors and protective tube for damage, and terminals for deformation.





2. Visually check the case and the gear for damage.

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, difficult operation, or excessive free play.

Harness Connector (Body and Front Wiring Harness)

Check for binding harness, connector damage, poor connections, and deformed terminals.