Diagnostic Trouble Codes (DTC'S)
WARNING: This page is about a different car, the 2003 Pontiac Grand Prix. However, it is still accessible from the selected car via links, so may be relevant.
Sensing and Diagnostic Module (SDM) provides a record of DTC's, stored according to type. SDM performs diagnostic monitoring of SIR system electrical components. When a malfunction occurs, SDM records DTC's in memory and turns on AIR BAG warning light. Current and history DTC's are stored in SDM.