Introduction to SRS Diagnosis

The SRS system is controlled by the SRS-ECU. The SRS-ECU judges how severe a collision is by detecting signals from the left and right front impact sensors and the analog G-sensor. If the impact is over a predetermined level, the SRS-ECU outputs an ignition signal. At this time, if the safing G-sensor is on, the SRS air bag will inflate.

The SRS warning light in the combination meter alerts a malfunction of the SRS system.

If the following symptoms occur even when the vehicle has not collided, there may be a malfunction.
- The SRS warning light does not go off within approximately 7 seconds after the ignition switch has been turned "ON."
- The SRS warning light does not illuminate when the ignition switch is turned "ON."

Refer to the Post-collision Diagnosis when inspecting and servicing the vehicle that has been in a collision.