Circuit Description
The AIR BAG warning lamp turns flashes seven times to verify operation when the inflatable restraint Sensing and Diagnostic and Seat Belt Pretensioner Module (SDM) recognizes Ignition voltage, applied to terminal 5, is greater than 9.0 volts. The SDM performs Initialization and Continuous Monitoring tests at this time. The SDM sets a current diagnostic trouble code and illuminates the AIR BAG warning lamp when a malfunction is detected. The SDM clears the current diagnostic trouble codes and moves them to a history file when the malfunction is no longer detected and/or the ignition switch is cycled.
Test Description
The numbers below refer to step numbers on the diagnostic table.
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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 SDM should not be replaced for a History DTC.
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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.
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When all circuitry outside the SDM has been found to operate properly, as indicated by the appropriate diagnostic table, then and only then should the SDM be replaced.
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
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
Were you sent here from a Symptom Table or a Diagnostic Trouble Code Table? | -- | |||
Does the AIR BAG warning lamp flash seven times, then go OFF? | -- | |||
Use the scan tool to request the SIR Diagnostic Trouble Code display. Is the same symptom or DTC occurring as when the SIR Diagnostic System Check was first performed? | -- | -- | ||
4 |
Does the AIR BAG warning lamp flash seven times, then go OFF? | -- | System OK | |
5 |
Is the replacement complete? | -- | -- | |
6 | Reconnect all the SIR system components. Ensure all components are properly mounted. Is all the SIR components reconnected and is all the SIR components properly mounted? | -- | -- | |
7 |
Is the SIR Diagnostic Trouble Codes cleared? | -- | -- |
