Circuit Description
WARNING: This page is about a different car, the 2004 Suzuki Swift + and 2004 Chevrolet Aveo. However, it is still accessible from the selected car via links, so may be relevant.
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.
In case of air bag inflation by a vehicle collision, the SDM maintains the warning lamp ON and then all the air bag systems including the SDM, air bag module, and wiring should be replaced.