SIR Diagnostic System Check

Diagnostic Chart:

These diagnostic procedures will help you to find and repair SIR system malfunctions. To get the best results, it is important to use the diagnostic tables and follow the sequence listed below.
1. PERFORM THE "SIR DIAGNOSTIC SYSTEM CHECK." The SIR DIAGNOSTIC SYSTEM CHECK must be the starting point of any SIR diagnostics. The SIR DIAGNOSTIC SYSTEM CHECK checks for proper AIR BAG warning lamp operation, the ability of the inflatable restraint control module to communicate through the serial data line and whether SIR diagnostic trouble codes exist.
2. REFER TO THE PROPER DIAGNOSTIC TABLE AS DIRECTED BY THE "SIR DIAGNOSTIC SYSTEM CHECK." The SIR DIAGNOSTIC SYSTEM CHECK will lead you to the correct table to diagnose any SIR system malfunctions. Bypassing these procedures may result In extended diagnostic time, Incorrect diagnosis and Incorrect part's replacement.
3. REPEAT THE "SIR DIAGNOSTIC SYSTEM CHECK" AFTER ANY REPAIR OR DIAGNOSTIC PROCEDURES HAVE BEEN PERFORMED. Per. forming the SIR DIAGNOSTIC SYSTEM CHECK after all repair or diagnostic procedures will make sure that you have done the correct repairs and that no other malfunctions exist.

CIRCUIT DESCRIPTION
The ignition switch supplies IGNITION 1 voltage to the inflatable restraint control module at terminal 10 using the AIR BAGS fuse. When the ignition switch is first turned to the RUN position, the inflatable restraint control module responds by flashing the AIR BAG warning lamp seven times, then turning it OFF, while performing tests on the SIR system.

DIAGNOSTIC AIDS
Diagnosing diagnostic trouble codes in the correct order is very important. Failure to diagnose the DTCs in the order specified may result in extended diagnostic time, incorrect diagnosis and incorrect parts replacement.

NOTES ON SYSTEM CHECK TABLE
1. The AIR BAG warning lamp should flash seven times after the ignition is first turned to the RUN position.
2. The AIR BAG warning lamp indicates improper operation. This test differentiates a warning lamp. stays ON condition from a warning lamp does not come ON condition.
3. The AIR BAG warning lamp should turn OFF after flashing seven times.
4. This test checks for proper operation of the serial data line.
6. This test will identify the stored diagnostic trouble codes and whether they are current or history.
7. This test checks for the proper operation of the serial data line. This test also identifies any stored history diagnostic trouble codes.