GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 2005 🢒 Aveo 🢒 Restraints 🢒 SIR 🢒 DTC 002

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.

Conditions for Setting the DTC
    • The resistance of the driver air bag deployment loop is lower than 1.8 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 completed?

--

Go to Step 2

Go to Diagnostic System Check - SIR

2
  1. Disconnect the negative battery cable.
  2. Remove the driver air bag module.
  3. Store the driver air bag module with the decorative side facing upward.
  4. Connect an ohmmeter to the terminals of the wiring harness connector for the driver air bag module.

Does the ohmmeter show the specified value?

∞

Go to Step 3

Go to Step 5

3
  1. Replace the sensing and diagnostic module (SDM).
  2. Reconnect the negative battery cable.
  3. Set the scan tool to CODE ERASE.
  4. Perform the Diagnostic System Check - SIR.

Is DTC 002 still shown as a current fault?

--

Go to Step 4

System OK

4
  1. Replace the driver air bag module.
  2. Reconnect the negative battery cable.

Is the repair complete?

--

Go to Diagnostic System Check - SIR

--

5
  1. Disconnect the clock spring wiring harness connector at the lower steering column.
  2. Connect an ohmmeter to the terminals at the SDM side of the clock spring connector.

Does the ohmmeter show the specified value?

∞

Go to Step 6

Go to Step 7

6
  1. Replace the clock spring.
  2. Reconnect the negative battery cable.

Is the repair complete?

--

Go to Diagnostic System Check - SIR

--

7
  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

--