When the ignition switch is turned to ON, the sensing and diagnostic module (SDM) will perform a turn-on test to diagnose critical malfunctions within the SDM itself.

If air bag inflation was caused by a vehicle collision, the SDM maintains warning lamp ON and the entire air bag system, including the SDM, air bag module, and wiring should be replaced.

The history of the air bag inflation or belt pretensioner explosion is in the SDM.

Caution: Refer to Sensing and Diagnostic Module Voltage after Ignition is Turned Off Caution in the Preface section.

Caution: Refer to Sensing and Diagnostic Module Handling Caution in the Preface section.