GM Service Manual Online
For 1990-2009 cars only

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.

These 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

    • The side air bag sensor wiring of the driver high is shorted to ground.
    • The side air bag sensor wiring of the driver low is shorted to ground.

Step

Action

Values

Yes

No

Caution: Refer to Sensing and Diagnostic Module Handling Caution in the Preface section.

Caution: Refer to SRS Sensing and Diagnostic Module Handling Caution in the Preface section.

 

1

  1. Confirm the ignition switch is OFF.
  2. Wait for 1 minute for the SDM charger to be discharged.

Has the SDM discharged?

--

Go to Step 2

--

2

Visually inspect any damage for the driver side air bag sensor wiring.

Is the driver side air bag sensor wiring damaged?

--

Go to Step 4

Go to Step 3

3

Measure the resistance between the high, low wiring of the driver side air bag sensor and the ground.

Is the resistance equal to the specified value?

10 K ohms

Go to Step 5

Go to Step 4

4

Replace the air bag wiring.

Is the replacement complete?

--

Go to Diagnostic System Check - SIR

--

5

  1. Replace the SDM. Refer to Inflatable Restraint Sensing and Diagnostic Module Replacement .
  2. Confirm the ignition switch is ON.
  3. Remove the DTC with the scan tool.
  4. Perform the Diagnostic System Check - SIR.

Is the DTC removed?

--

System OK

Go to Step 6

6

Replace the driver side air bag sensor. Refer to Inflatable Restraint Side Impact Sensor Replacement .

Is the replacement complete?

--

Go to Diagnostic System Check - SIR

--