GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 2008 🢒 Optra - Mexico 🢒 Restraints 🢒 SIR 🢒 DTC 007

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.

Upon passing this 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 deployment loops.

DTC Descriptor

This diagnostic procedure supports the following DTC:

DTC 007 Passenger Air Bag Deployment Loop Short to Ground

Conditions for Running the DTC

Ignition voltage is within the normal operating voltage range.

Conditions for Setting the DTC
    • The air bag wiring of the passenger high is shorted to ground.
    • The air bag wiring of the passenger low is shorted to ground.

Action Taken When the DTC Sets

The SDM commands the AIR BAG indicator ON.

Conditions for Clearing the DTC

The condition responsible for setting the DTC no longer exists and the scan tool Clear DTCs function is used.

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.

Schematic Reference: SIR Schematics

Connector End View Reference: SIR Connector End Views

1

Did you perform the Diagnostic System Check - Vehicle?

--

Go to Step 2

Go to Diagnostic System Check - Vehicle

2
  1. Disconnect the negative battery cable.
  2. Wait 1 minute for the sensing and diagnostic module (SDM) capacitor to discharge.
  3. Visually inspect the supplemental inflatable restraints (SIR) wiring harness.

Is there any visible damage to the SIR harness?

--

Go to Step 3

Go to Step 4

3

Replace the SIR wiring harness.

Did you complete the repair?

--

Go to Step 7

--

4
  1. Disconnect the electrical connector from the instrument panel (I/P) module.
  2. Disconnect the electrical connector at the SDM.

    3. The shorting bar at the disconnected SDM connector will create a complete circuit between the wires from the I/P module.

  3. Use an ohmmeter to check the continuity between ground and each of the terminals at the SDM side of the wiring harness connector for the I/P module.

Is the resistance less than the specified value?

∞

Go to Step 3

Go to Step 5

5
  1. Replace the SDM. Refer to Inflatable Restraint Sensing and Diagnostic Module Replacement .
  2. Reconnect the negative battery cable.
  3. Use the scan tool in order to clear the DTCs.
  4. Perform the Diagnostic System Check - Vehicle .

Is DTC 007 still shown as a current fault?

--

Go to Step 6

Go to Step 7

6

Replace the I/P module. Refer to Inflatable Restraint Instrument Panel Module Replacement .

Did you complete the repair?

--

Go to Step 7

--

7
  1. Reconnect all SIR components.
  2. Verify that all components, connectors and connector position assurances (CPAs) are properly mounted.
  3. Use the scan tool in order to clear the DTCs.
  4. Operate the vehicle within the Conditions for Running the DTC, as specified in the supporting text.

Does the DTC reset?

--

Go to Step 2

System OK