GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 2005 🢒 Optra 🢒 Restraints 🢒 SIR 🢒 DTC 033

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.

If driver side air bag inflation was caused by side impact, the SDM maintains warning lamp ON and the entire air bag system should be inspected, including pretensioners. The side air bag sensor and wiring should be replaced. If the driver side air bag inflation by side impact counts over 5, the SDM should also be replaced.

Conditions for Setting the DTC

The history of the air bag inflation or belt pretensioner explosion is in 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.

Did you perform the Diagnostic System Check - SIR?

Go to Step 2

Go to Diagnostic System Check - SIR

2
  1. Disconnect the negative battery cable.
  2. Wait 1 minute for the sensing and diagnostic module (SDM) capacitor to discharge.
  3. Visually inspect the supplemental inflatable restraints (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 SDM. Refer to Inflatable Restraint Sensing and Diagnostic Module Replacement .

Did you complete the repair?

Go to Diagnostic System Check - SIR

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

Did you complete the repair?

Go to Diagnostic System Check - SIR

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