Introduction to SRS Diagnosis

INTRODUCTION TO 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, front air bag analog G-sensor and front sir bag safing 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 been in a collision, there may be a malfunction in the SRS system.
- The SRS warning light does not go off within approximately seven 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.