GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 2005 🢒 Aveo 🢒 DTC 🢒 DTC 031

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.

Conditions for Setting the DTC
    • The SDM does not pass internal tests.
    • The wiring harness of the SDM should be inspected before replacing the SDM.

Step

Action

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
  1. Disconnect the negative battery cable.
  2. Wait 1 minute for the SDM capacitor to discharge.
  3. Visually inspect the supplemental inflatable restraint (SIR) wiring harness.

Is there any visible damage to the SIR harness?

Go to Step 4

Go to Step 3

3
  1. Disconnect the negative battery cable.
  2. Replace the sensing and diagnostic module (SDM).

Is the repair complete?

Go to Diagnostic System Check - SIR

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4
  1. Replace the SIR wiring harness.
  2. Reconnect the negative battery cable.

Is the repair complete?

Go to Diagnostic System Check - SIR

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