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 the 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 resistance of the driver side air bag deployment loop is lower than 1.4 ohms. |
| • | The shorting bar is damaged and then the SDM must be replaced. |
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 connector and the wiring of the driver air bag module Is the wiring damaged? | -- | Go to Step 6 | Go to Step 3 |
3 |
Is the resistance as specified? | ∞ | Go to Step 4 | Go to Step 6 |
4 |
Is DTC 053 still shown as a current fault? | -- | Go to Step 5 | System OK |
5 | Replace the driver air bag module. Refer to Inflatable Restraint Steering Wheel Module Replacement. Did you complete the repair? | -- | -- | |
6 | Replace the supplemental inflatable restraints (SIR) wiring harness. Did you complete the repair? | -- | -- | |
