K 2500 Suburban 4WD V8-5.7L VIN R (1999)
Air Bag Control Module: Testing and Inspection
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 7 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 (DTC) and illuminates the AIR BAG warning lamp. The SDM will clear current DTCs and preserve them in a history file when
the following items are true:
^
The malfunction is no longer detected.
^
The ignition switch is cycled.
Important: Repair the malfunction that set the DTC before you replace the SDM.
This does not include the following latched codes:
^
DTC B1018
^
DTC B1024
^
DTC B1051
^
DTC B1053
^
DTC B1071
You may not clear a latched code.
Test Description
The numbers below refer to the step numbers on the diagnostic table:
2. This test confirms a circuit malfunction. If no current malfunction is occurring (history DTC set), refer to the Diagnostic Aids for the appropriate
DTC table as indicated through the Scan Tool. Do not replace the Inflatable Restraint Sensing and Diagnostic Module (SDM) for a history DTC
other than DTC B1071.
3. This test inspects for a malfunction introduced into the SIR system during the diagnostic process. A malfunctioning SDM would unlikely cause a
