Circuit Description
WARNING: This page is about a different car, the 2002 GMC Savana and 2002 Chevrolet Chevy Express. However, it is still accessible from the selected car via links, so may be relevant.
When ignition is turned on, Sensing and Diagnostic Module (SDM) performs continuous diagnostic tests on deployment loop to check for proper circuit continuity and for shorts to ground or voltage. Sensing and Diagnostic Module (SDM) monitors front end discriminating sensor circuit for front impact detection. SDM processes this signal to further support deployment of air bags. Front end discriminating sensor is an input only device and is not part of deployment loop.