Component Tests and General Diagnostics

Scan Tool Connection:

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 AIR BAG CONTROL UNIT (SRS-ECU) MEMORY CHECK

1. Connect the scan tool to the data link connector.

Caution: Turn the ignition switch off before disconnecting or connecting the scan tool.

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-ECU. 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 5 seconds or more, read and write down all displayed diagnostic trouble codes.

POST COLLISION REPAIR PROCEDURE
1. When air bag deploys in a collision, replace the following parts with new ones.
- SRS air bag control unit (SRS-ECU)
- Air bag modules

2. Check the following parts, and replace if any malfunctions are present.
- Clock spring
- Steering wheel, steering column and intermediate joint (Refer to Steering wheel and Shaft.)
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, binds or difficult operation and excessive free play.

3. 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.

SRS-ECU:

SRS Air Bag Control Unit (SRS-ECU)

1. Check SRS-ECU case and brackets for dents, cracks or deformation.
2. Check connector for damage, and terminals for deformation.

Pad Cover:

Inflator Case:

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 Connectors:

Clock Spring
1. Check clock spring connectors and protective tube for damage, and terminals for deformation.
2. Visually check the case 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.