GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 2005 🢒 Spark 🢒 Restraints 🢒 SIR 🢒 DTC 001

Circuit Description

When the ignition switch is turned ON, the sensing and diagnostic module (SDM) will perform tests to diagnose any malfunctions within itself.

After passing these tests, the SDM will check the driver air bag module firing circuit. The SDM allows a very small amount of current to flow through the driver air bag module firing circuit. The SDM monitors the circuit resistance during this check.

Conditions for Setting the DTC

The combined resistance of the driver air bag module, the harness wiring, and the connector contacts is above a specified value, as with an open circuit.

Step

Action

Values

Yes

No

Caution: Refer to Battery Disconnect Caution in the Preface section.

Caution: Refer to SIR Special Tool Caution in the Preface section.

Caution: This vehicle is equipped with Supplemental Inflatable Restraint (SIR). Refer to the Cautions in the On-Vehicle Service and the SIR Component and Wiring Location view in the Supplemental Inflatable (SIR) System before any performing service on or around SIR components or wiring. Failure to follow the Cautions could result in possible air bag deployment, personal injury, or otherwise unneeded SIR system repairs.

1

Examine the wiring and the connector at the driver air bag module.

Is the connector disconnected?

--

Go to Step 2

Go to Step 3

2
  1. Reconnect the driver air bag module connector.
  2. Reinstall the driver air bag module in the steering wheel.
  3. Reconnect the negative battery terminal.

Is the repair complete?

--

Go to Diagnostic System Check - SIR

--

3
  1. Remove the driver air bag module.
  2. Place the driver air bag module in a secure position with the decorative surface facing upward.
  3. Disconnect the electrical connector at the SDM.

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

  4. Connect an ohmmeter to the terminals of the wiring harness connector for the driver air bag module. Refer to Diagnostic Illustration 3 in SIR Diagnostic Illustrations .

Does the ohmmeter indicate the specified value?

0 ohms

Go to Step 4

Go to Step 6

4
  1. Replace the SDM.
  2. Reconnect the negative battery cable.
  3. Set the scan tool for CODE ERASE.
  4. Perform the diagnostic system check.

Does DTC 001 still show as a current fault?

--

Go to Step 5

System OK

5
  1. Replace the driver air bag module.
  2. Reconnect the negative battery terminal.

Is the repair complete?

--

Go to Diagnostic System Check - SIR

--

6
  1. Disconnect the coil 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 coil spring.

  2. Connect an ohmmeter to the terminals at the SDM side of the coil spring connector. Refer to Diagnostic Illustration 4 in SIR Diagnostic Illustrations .

Does the ohmmeter show the specified value?

0 ohms

Go to Step 7

Go to Step 8

7
  1. Replace the coil spring.
  2. Reconnect the negative battery terminal.

Is the repair complete?

--

Go to Diagnostic System Check - SIR

--

8
  1. Replace the SIR wiring harness.
  2. Reconnect the negative battery cable.

Is the repair complete?

--

Go to Diagnostic System Check - SIR

--