Circuit Description
WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2002 GMC Sierra, 2002 GMC Cab & Chassis Sierra, 2002 GMC C3500 HD, 2002 Chevrolet Silverado, and 2002 Chevrolet Cab & Chassis Silverado. 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 loops 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.