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 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 air bag wiring of the driver high is shorted to battery wiring. |
| • | The air bag wiring of the driver 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? | Go to Step 2 | ||
2 | Visually inspect the supplemental inflatable restraints (SIR) harness for damage. Is there any visible damage to the SIR harness? | -- | Go to Step 3 | Go to Step 4 |
3 | Replace the SIR wiring harness. Did you complete the repair? | -- | -- | |
4 |
Is the resistance as specified? | 10k ohms | Go to Step 5 | Go to Step 7 |
5 |
Is DTC 004 still shown as a current fault? | -- | Go to Step 6 | System OK |
6 | Replace the driver air bag module. Refer to Inflatable Restraint Steering Wheel Module Replacement . Did you complete the repair? | -- | -- | |
7 |
Is the resistance as specified? | 10k ohms | Go to Step 8 | Go to Step 3 |
8 | Replace the clock spring. Refer to Inflatable Restraint Steering Wheel Module Coil Replacement . Did you complete the repair? | -- | -- | |
