Chart A - Inflatable Restraint Control Module Integrity Check: Description

When inflatable restraint control module recognizes IGNITION 1 voltage applied to terminal No. 10 is greater than 8.2 volts, the inflatable restraint control module flashes AIR BAG warning light 7 times to verify operation. At this time inflatable restraint control module performs Power ON tests followed by RESISTANCE MEASUREMENT and CONTINUOUS MONITORING tests. When a malfunction is detected, inflatable restraint control module sets a current diagnostic trouble code and turns AIR BAG warning light on. Inflatable restraint control module will clear current diagnostic trouble codes and move them to a history file when malfunction is not longer detected and/or ignition switch is cycled, except for DTCs 18, 24, 51, 53, and 71, which are latched codes and cannot be cleared. DTC 71 may not clear using a scan tool clear codes command. Repair malfunction that set DTC before replacement of inflatable restraint control module.

1. This test confirms a current malfunction. If no current malfunction is occurring (History DTC set) Diagnostic Aids for appropriate diagnostic trouble code should be referenced. Inflatable restraint control module should not be replaced for a History DTC.
2. This test checks for a malfunction introduced into SIR system during diagnostic process. It is extremely unlikely that a malfunctioning inflatable restraint control module would cause a new malfunction to occur during diagnostic process.
3. When all circuitry outside inflatable restraint control module has been found to operate properly, as indicated by appropriate diagnostic table, then and only then should inflatable restraint control module be replaced.

Fig 1: Chart A - Inflatable Restraint Control Module Integrity Check (1 Of 2)

Courtesy of GENERAL MOTORS CORP.