GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 2004 🢒 Vivant 🢒 Restraints 🢒 SIR 🢒 Sensing and Diagnostic Module Integrity Check

The following diagnostic chart must be used when all circuitry outside the sensing and diagnostic module (SDM) has been found to operate properly, as indicated by following the appropriate diagnostic trouble code (DTC) chart. The chart verifies the need for SDM replacement.

Circuit Description

When the SDM recognize ignition voltage greater then 9 volts at terminal A1 of the SDM, the AIRBAG indicator flashes seven times to verify operation. At this time the SDM performs turn-on tests followed by resistance measurement tests and continues monitoring tests. When a malfunction is detected, the SDM sets a current DTC and illuminates the AIRBAG indicator. When the malfunction is no longer detected and/or the ignition switch is cycled, the SDM will clear current DTCs and move them to a history file, except for the DTCs 51, 53 and sometimes 71. DTCs 51 and 53 will not clear using a scan tool because these codes require replacement of the SDM. The SDM must be replaced only after the malfunction that set the DTC has been repaired.

SDM Integrity Check

Caution: Refer to Sensing and Diagnostic Module Voltage after Ignition is Turned Off Caution in the Preface section.

Caution: Refer to Sensing and Diagnostic Module Handling Caution in the Preface section.

Step

Action

Yes

No

1
  1. Turn OFF the ignition and remove the key.
  2. Connect all SIR components, and ensure that all components are properly mounted.
  3. Ensure that the ignition switch has been off for at least 30 seconds.
  4. As the ignition is turned ON, observe the AIRBAG indicator.

Does the indicator lamp flash seven times and then turn off?

Go to Diagnostic System Check - SIR

Go to Step 2

2
  1. Turn OFF the ignition and remove the key.
  2. Connect the scan tool to DLC. Follow the directions given in the scan tool manual.
  3. Turn ON the ignition.
  4. Request SRS DTC display with the scan tool.

Is the same DTC displayed that was previously occurring when the Diagnostic System Check - SIR was previously performed?

Go to Step 3

Go to the appropriate DTC for Diagnosis

3
  1. Clear the DTCs.
  2. Turn OFF the ignition for at least 30 seconds.
  3. As the ignition is turned ON, observe the AIRBAG indicator.

Does the AIRBAG indicator flash seven times and turn off?

System OK

Go to Step 4

4
  1. Turn OFF the ignition and remove the key.
  2. Disconnect the SDM connector.
  3. Replace the SDM. Refer to Inflatable Restraint Sensing and Diagnostic Module Replacement .
  4. Connect the SDM connector and ensure that all components are properly mounted.

Did you complete the repair?

Go to Diagnostic System Check - SIR

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