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 passenger high is shorted to battery wiring.
    • The side air bag sensor wiring of the passenger low is shorted to battery wiring.

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 and the sensing and diagnostic module (SDM) fuse has been removed.
  2. Wait for 1 minute for the SDM charger to be discharged.

Has the SDM discharged?

--

Go to Step 2

--

2

Visually inspect for any damage on the passenger side air bag sensor wiring and the connector.

Are the passenger side air bag sensor wiring and connector OK?

--

Go to Step 4

Go to Step 3

3

Connect the connector or repair the damage.

Did you complete the action?

--

Go to Diagnostic System Check - SIR

--

4

Measure the resistance between the SDM and the high, low terminal of the passenger side air bag sensor and the battery.

Is the resistance equal to the specified value?

10 K ohms

Go to Step 6

Go to Step 5

5

Replace the air bag wiring.

Is the replacement complete?

--

Go to Diagnostic System Check - SIR

--

6

  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?

--

Go to Diagnostic System Check - SIR

Go to Step 7

7

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

Is the replacement complete?

--

Go to Diagnostic System Check - SIR

--