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.

Upon passing this test, ignition and deployment loop voltages are measured to ensure they are within the normal voltage ranges. The SDM monitors the voltages at the driver low and 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 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

Did you perform the Diagnostic System Check - SIR?

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

Is the air bag wiring damaged?

--

Go to Step 3

Go to Step 4

3

Replace the air bag wiring.

Did you complete the replacement?

--

Go to Diagnostic System Check - SIR

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4

Measure the resistance between the SDM and the high, low terminal of the passenger 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 3

5

  1. Replace the SDM. Refer to Inflatable Restraint Sensing and Diagnostic Module Replacement.
  2. Turn ON the ignition.
  3. Using the scan tool, Clear DTCs.
  4. Perform Diagnostic System Check - SIR.

Is DTC 084 still shown as a current fault?

--

Go to Step 6

System OK

6

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

Did you complete the replacement?

--

Go to Diagnostic System Check - SIR

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