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 deployment loops.
DTC Descriptor
This diagnostic procedure supports the following DTC:
DTC 053 Left Side Air Bag Deployment Loop Resistance Too Low
Conditions for Running the DTC
Ignition voltage is within the normal operating voltage range.
Conditions for Setting the DTC
| • | The resistance of the driver side impact module deployment loop is lower than 1.4 ohms. |
| • | The shorting bar is damaged and then the SDM must be replaced. |
Action Taken When the DTC Sets
The SDM commands the AIR BAG indicator ON.
Conditions for Clearing the DTC
The condition responsible for setting the DTC no longer exists and the scan tool Clear DTCs function is used.
Step | Action | Values | Yes | No |
|---|---|---|---|---|
Schematic Reference: SIR Schematics Connector End View Reference: SIR Connector End Views 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 a Diagnostic System Check - Vehicle? | -- | Go to Step 2 | |
2 |
Does the ohmmeter show the specified value? | ∞ | Go to Step 3 | Go to Step 5 |
3 |
Is DTC 053 still shown as a current fault? | -- | Go to Step 4 | Go to Step 6 |
4 | Replace the driver side impact module. Did you complete the repair? | -- | Go to Step 6 | -- |
5 | Replace the supplemental inflatable restraints (SIR) wiring harness. Did you complete the repair? | -- | Go to Step 6 | -- |
6 |
Does the DTC reset? | Go to Step 2 | System OK | |
