Chart A SDM Integrity Check

Wiring Diagram:

CIRCUIT DESCRIPTION
When the DERM recognizes "Ignition 1" voltage applied to terminals "A9" and "A10," is in the normal operating voltage range, the "AIR BAG" warning lamp is flashed 7 times to verify operation. At this time the DERM performs "Turn-ON" tests followed by "Continuous Monitoring" tests. When no malfunctions are detected the DERM proceeds to the "Initiator Assembly Resistance Test." When a malfunction is detected, the DERM sets a current diagnostic trouble code and illuminates the "AIR BAG" warning lamp. The DERM will clear current diagnostic trouble codes and move them to a history file when the malfunction is no longer detected and the ignition switch is cycled, except for DTC 51. DTC 51 can only be cleared using a scan tool "Clear Codes" command.

TABLE TEST DESCRIPTION
Number(s) below refer to step number(s) on the diagnostic table.
1. The "SIR DIAGNOSTIC SYSTEM CHECK" must be the starting point for all diagnostics.
2. This test confirms a current malfunction. If no current malfunction is occurring (History DTC set), the "Diagnostic Aids" for the appropriate diagnostic trouble code should be referenced. The DERM should not be replaced for a history diagnostic trouble code, except when directed by the appropriate diagnostic table.
3. This test checks for a malfunction introduced into the SIR system during the diagnostic process. It is extremely unlikely that a malfunctioning DERM would cause a new malfunction to occur during the diagnostic process.
4. When all circuitry outside the DERM has been found to operate properly, as indicated by the appropriate diagnostic table, then and only then should the DERM be replaced.
5. The symptom or DTC is no longer occurring. The condition may be intermittent or inadvertently repaired during diagnosis of the SIR system. Refer to "INTERMITTENTS AND POOR CONNECTIONS." SIR Diagnostic System Check