Table A SIR Sensing & Diagnostic Module Integrity Check

Wiring Diagram:

This table assumes that the SIR Diagnostic System Check and either a symptom table or a diagnostic trouble code table diagnosis has been performed. When all circuitry outside the inflatable restraint Sensing and Diagnostic Module (SDM) has been found to operate properly, as indicated by the appropriate diagnostic table, and the symptom or DTC remains current, the following diagnostic procedures must be performed to verify the need for SDM replacement.

CIRCUIT DESCRIPTION
When the inflatable restraint Sensing and Diagnostic Module (SDM) recognizes IGNITION 1 voltage, applied to terminal 10 is greater than 8.2 volts, the SDM flashes the AIR BAG warning lamp seven times to verify operation. At this time the SDM performs POWER-ON tests followed by the RESISTANCE MEASUREMENT test and the CONTINUOUS MONITORING tests. Upon detection of a malfunction, the SDM sets a current diagnostic trouble code and illuminates the AIR BAG warning lamp. The SDM will clear current diagnostic trouble codes and move them to a history file when:
^ The malfunction is no longer detected.
^ The ignition switch is cycled.

This does not include DTCs B1018, B1024, B1051, B1053 and B1071. DTCs B1018 B1024, B1051, and B1053 are latched codes. You cannot clear a latched code. DTC B1071 may not clear after you issue a CLEAR CODES command. Repair the malfunction that set the DTC before you replace the SDM.

TABLE TEST DESCRIPTION

Number(s) below refer to step number(s) on the diagnostic table.
2. This test confirms a current malfunction. If no current malfunction is occurring (history DTC set) reference the Diagnostic Aids for the appropriate diagnostic trouble code. Do not replace the SDM for a history DTC unless DTC B1071 is set.
3. This test checks for a malfunction introduced into the SIR system during the diagnostic process. It is extremely unlikely that a malfunctioning SDM would cause a new malfunction to occur during the diagnostic process.
4. When you have found all circuitry outside the SDM to operate properly, as indicated by the appropriate diagnostic table, then and only then should the SDM be replaced.