GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 2005 🢒 Spark 🢒 Restraints 🢒 SIR 🢒 DTC 024

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 completing the internal tests, the SDM will check its voltage supply. If the voltage supply is too high or too low, the SDM may not receive the proper information when it attempts to use a known current to test the air bag module circuits.

Conditions for Setting the DTC

The SDM receives the voltage lower than a specified value.

Step

Action

Values

Yes

No

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

Caution: As a safety precaution, disconnect the connector for the passenger air bag module. Unintentional deployment of the air bags can cause injury.

1

Check the fuse F2.

Is the fuse blown?

--

Go to Step 2

Go to Step 3

2
  1. Check for a short circuit.
  2. Repair if needed.
  3. Replace the fuse.

Is the repair complete?

--

Go to Diagnostic System Check - SIR

--

3
  1. Turn the ignition ON.
  2. Using a multimeter, check the voltage at the fuse F2.

Is the battery voltage available at the fuse F2?

11-14 V

Go to Step 5

Go to Step 4

4

Repair the power supply to the fuse F2.

Is the repair complete?

--

Go to Diagnostic System Check - SIR

--

5
  1. Disconnect the negative battery cable.
  2. Wait 1 minute before proceeding.
  3. Disconnect the connector at the SDM.
  4. Reconnect the battery.
  5. Turn the ignition key ON.
  6. Measure the voltage at the terminal 5 of the SDM connector. Refer to Diagnostic Illustration 11 in SIR Diagnostic Illustrations .

Is the voltage equal to the specified value?

11-14 V

Go to Step 6

Go to Step 7

6
  1. Replace the SDM.
  2. Reconnect the electrical connectors.

Is the repair complete?

--

Go to Diagnostic System Check - SIR

--

7
  1. Disconnect the connector C208.

    2. The connector C208 is the connector between the instrument harness and the supplemental inflatable restraints (SIR) harness.

  2. Turn the ignition ON.
  3. Using a multimeter, check the voltage on the instrument harness side at the terminal 2 of the connector C208. Refer to Diagnostic Illustration 12 in SIR Diagnostic Illustrations .

Is the voltage equal to the specified value?

11-14 V

Go to Step 8

Go to Step 9

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

Is the repair complete?

--

Go to Diagnostic System Check - SIR

--

9

Repair the open circuit between the fuse F2 and the connector C208.

Is the repair complete?

--

Go to Diagnostic System Check - SIR

--