GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 2006 🢒 Aveo 🢒 Restraints 🢒 SIR 🢒 DTC 004

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 004 Driver Air Bag Deployment Loop Short To Voltage

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 driver high is shorted to battery wiring.
    • The air bag wiring of the driver low is shorted to battery wiring.

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 a Diagnostic System Check - Vehicle?

Go to Step 2

Go to Diagnostic System Check - Vehicle

2

Visually inspect the SIR harness for damage.

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 9

--

4
  1. Remove the steering wheel module. Refer to Inflatable Restraint Steering Wheel Module Replacement .
  2. Disconnect the electrical connector at the sensing and diagnostic module (SDM).
  3. Test the resistance between the high and low circuits of the steering wheel module deployment loop and battery positive.

Does the resistance measure less than the specified value?

∞

Go to Step 7

Go to Step 5

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

Is DTC 004 still shown as a current fault?

--

Go to Step 6

Go to Step 9

6

Replace the steering wheel module. Refer to Inflatable Restraint Steering Wheel Module Replacement .

Did you complete the repair?

--

Go to Step 9

--

7
  1. Disconnect the steering wheel module coil wiring harness at the lower steering column.
  2. Test the resistance between the high and low circuits of the steering wheel module deployment loop and battery positive on the SDM side of the steering wheel module coil connector.

Is the resistance less than the specified value?

∞

Go to Step 3

Go to Step 8

8

Replace the steering wheel module coil. Refer to Inflatable Restraint Steering Wheel Module Coil Replacement .

Did you complete the repair?

--

Go to Step 9

--

9
  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