SIR Diagnostic Trouble Code Logic

CAUTION: IN ORDER TO AVOID DEPLOYING THE AIR BAG WHEN TROUBLESHOOTING THE SIR SYSTEM, USE ONLY THE EQUIPMENT SPECIFIED AND THE INSTRUCTIONS GIVEN. FAILURE TO USE THE SPECIFIED EQUIPMENT AS INSTRUCTED COULD CAUSE AIR BAG DEPLOYMENT, PERSONAL INJURY TO YOU OR SOMEONE ELSE, OR UNNECESSARY SIR SYSTEM REPAIRS.

DIAGNOSTIC TROUBLE CODES
The "SIR Diagnostic System Check" must always be the starting point at any SIR system diagnosis. The "SIR Diagnostic System Check" checks for proper AIR BAG warning lamp operation and checks for SIR diagnostic trouble codes using a scan tool.
1. Active diagnostic trouble codes (DTCs) - Malfunctions that are presently being detected. Current diagnostic fault codes are stored in random access memory (RAM).
2. History diagnostic trouble codes - All malfunctions detected since the last time the history memory was cleared. History diagnostic trouble codes are stored in electrically erasable programmable read only memory (EEPROM).

IMPORTANT: Saturn has a unique fault code feature - a second occurrence of the same fault will cause the lamp to stay On even though the fault may have cleared. The DTC will be stored in history, and if intermittent the code may be active.