GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 2005 🢒 Aveo 🢒 Restraints 🢒 SIR 🢒 DTC 003

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.

If the resistance is in the 2 kilo ohms between 10 kilo ohms, the defect may occur depending upon the SDM. The normal resistance is over 10 kilo ohms.

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

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

Visually inspect the supplemental inflatable restraint (SIR) wiring harness for damage.

Is there any visible damage to the SIR harness?

--

Go to Step 3

Go to Step 4

3
  1. Replace the SIR wiring harness.
  2. Reconnect the negative battery cable.

Is the repair complete?

--

Go to Diagnostic System Check - SIR

--

4
  1. Disconnect the negative battery cable.
  2. Remove the driver air bag module.
  3. Place the driver air bag module in a secure position with the decorative surface facing upward.
  4. Disconnect the electrical connector at the sensing and diagnostic module (SDM).

    5. The shorting bar at the disconnected SDM connector will create a complete circuit between the wires from the driver air bag module.

  5. Use an ohmmeter to measure the continuity between ground and one of the terminals on the wiring harness connector for the driver air bag module.

Is the resistance less than the specified value?

∞

Go to Step 7

Go to Step 5

5
  1. Replace the SDM.
  2. Reconnect the negative battery cable.
  3. Set the scan tool for CODE ERASE.
  4. Perform the Diagnostic System Check - SIR.

Is DTC 003 still shown as a current fault?

--

Go to Step 6

System OK

6
  1. Replace the driver air bag module.
  2. Reconnect the negative battery cable.

Is the repair complete?

--

Go to Diagnostic System Check - SIR

--

7
  1. Disconnect the clock spring wiring harness connector at the lower steering column.

    2. The shorting bar at the disconnected SDM connector will create a complete circuit between the wires from the clock spring.

  2. Using an ohmmeter, check for continuity between ground and one of the terminals on the SDM side of the clock spring connector.

Is the resistance less than the specified value?

∞

Go to Step 2

Go to Step 8

8
  1. Replace the clock spring.
  2. Reconnect the negative battery terminal.

Is the repair complete?

--

Go to Diagnostic System Check - SIR

--