Diagnostic Trouble Codes (DTC'S)
WARNING: This page is about a different car, the 2002 Pontiac Firebird and 2002 Chevrolet Camaro. However, it is still accessible from the selected car via links, so may be relevant.
Sensing and Diagnostic Module (SDM) provides a record of Diagnostic Trouble Codes (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.