Test Description

WARNING: This page does not describe the selected car, but rather 10 other vehicles, including the 1998 GMC Yukon, 1998 GMC Suburban, 1998 GMC Pickup, 1998 GMC Cab & Chassis, and 1998 GMC C3500 HD. However, it is still accessible from the selected car via links, so may be relevant.

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 checks for a malfunction introduced into the SIR system during the diagnostic process. It is unlikely that a malfunctioning SDM would cause a new malfunction to occur during this process
4 When you have found all circuitry outside the SDM to operate properly, as indicated by the appropriate diagnostic table, replace the SDM

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 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