Description of On-Board Diagnostics

TROUBLESHOOTING

Self-diagnosis Function

The SRS unit includes a self-diagnosis function. If there is a failure in the sensors, SRS unit, inflator, or their circuits, the SRS indicator light in the gauge assembly goes ON.





As a system check, the SRS indicator light also comes on when the ignition is first turned to the II position. If the light goes off after approximately six seconds, the system is OK.

If the SRS indicator light remains on (or fails to come on in the system check mode), one of the SRS components (or the wiring/connectors in between) is faulty.

Troubleshooting Precautions

- Always use the test harness. Do not use test probes directly on component connector terminals or wires; you may damage them or the SRS unit.
- When connecting any of the test harnesses to the system, push the connectors straight-in; do not bend the connector terminals.
- Before disconnecting any part of the SRS wire harness, install the short connector (RED) on the driver's airbag. On cars equipped with a front passenger's airbag, install short connectors on the driver's airbag and the front passenger's airbag.

SRS Indicator Light Troubleshooting

Possible conditions:

1. SRS indicator light does not come on at all.
2. SRS indicator light stays on constantly.
3. SRS indicator light comes on in combination with a failure of another electrical system (brake system light, malfunction indicator lamp (MILl etc.). Check for damage/corrosion at the under-dash fuse/relay box connector.

NOTE:
- Before starting the applicable troubleshooting, check the condition of all SRS connectors and ground points.
- If the fault is not found after completing the applicable troubleshooting, substitute a known- good SRS unit and check whether the indicator light goes off.