General Information

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.

The SIR Diagnostic System Check must always be the starting point of any SIR system diagnosis. The SIR Diagnostic System Check tests for the correct operation of the AIR BAG warning lamp, and tests for SIR Diagnostic Trouble Codes (DTC) using the scan tool. The following describes the difference between current DTCs and history DTCs:
^ Current DTCs - Malfunctions that are presently being detected. Random-Access Memory (RAM) stores the current DTCs. Turning the ignition switch to the OFF position erases current DTCs. The presence Of a current DTC will cause the inflatable restraint Sensing and Diagnostic Module (SDM) to turn ON the AIR BAG warning lamp.
^ History DTCs - All malfunctions that are detected since last clearing of history memory. Electrically Erasable Programmable Read Only Memory (EEPROM) stores the history DTCs. A scan tool CLEAR CODES command will erase history DTCs.