GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 2005 🢒 Aveo 🢒 Restraints 🢒 SIR 🢒 DTC 086

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

A communication error occurs between the SDM and the passenger side air bag sensor.

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. Confirm the ignition switch is OFF.
  2. Wait 1 minute for the sensing and diagnostic module (SDM) charger to be discharged.
  3. Visually inspect any damage for the passenger side air bag sensor wiring and connector.

Is the air bag wiring damaged?

Go to Step 3

Go to Step 4

3

Replace the air bag wiring.

Is the repair complete?

Go to Diagnostic System Check - SIR

--

4
  1. Replace the passenger side air bag sensor.
  2. Reconnect the negative battery cable.
  3. Set the scan tool to CODE ERASE.
  4. Perform the Diagnostic System Check - SIR.

Is DTC 086 still shown as a current fault?

Go to Step 5

Go to Diagnostic System Check - SIR

5

Replace the SDM.

Is the repair complete?

Go to Diagnostic System Check - SIR

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