GM Service Manual Online
For 1990-2009 cars only

Circuit Description

When the ignition switch is turned to ON, the sensing and diagnostic module (SDM) will perform a turn-on test to diagnose critical malfunctions within the SDM itself.

The test ignition and deployment loop voltages are measured to ensure that they are within their normal voltage ranges. The SDM monitors the voltages at the driver low and the passenger low to detect shorts to ground or voltage in the deploy loops.

The SDM inspects the wiring connection to the passenger air bag module by letting the infinitesimal current flow through the internal circuit and verify the resistance.

Conditions for Setting the DTC

    • The resistance of driver air bag deployment loop is lower than 1.4 ohms.
    • The shorting bar is damaged and then the SDM must be replaced.

Step

Action

Values

Yes

No

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.

 

1

Perform the Diagnostic System Check - SIR.

Is the Diagnostic System Check - SIR complete?

--

Go to Step 2

Go to Diagnostic System Check - SIR

2

  1. Disconnect the negative battery cable.
  2. Remove the passenger side air bag module.
  3. Connect an ohmmeter to the terminals of the wiring harness connector for the passenger air bag module on the sensing and diagnostic module (SDM) side of the connector.

Does the ohmmeter show the specified value?

Go to Step 3

Go to Step 5

3

  1. Replace the SDM.
  2. Install the passenger side air bag module.
  3. Reconnect the negative battery cable.
  4. Set the scan tool to CODE ERASE.
  5. Perform the Diagnostic System Check - SIR.

Is DTC 006 still shown as a current fault?

--

Go to Step 4

System OK

4

  1. Replace the passenger air bag module.
  2. Reconnect the negative battery cable.

Is the repair complete?

--

Go to Diagnostic System Check - SIR

--

5

  1. Replace the supplemental inflatable restraint (SIR) wiring harness.
  2. Reconnect the negative battery cable.

Is the repair complete?

--

Go to Diagnostic System Check - SIR

--