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.
The SDM inspects the wiring connection to the driver belt pretensioner module by letting the perpetual current flow through the internal circuit and verify the resistance. If the resistance is between 2-10 kilo ohms, the defect may occur depending upon the SDM. The normal resistance is over 10 kilo ohms.
DTC Descriptor
This diagnostic procedure supports the following DTC:
DTC B1363 Driver Pretensioner Deployment Loop Short to Ground
Conditions for Running the DTC
Ignition voltage is within the normal operating voltage range.
Conditions for Setting the DTC
| • | The belt pretensioner wiring of the driver high is shorted to ground. |
| • | The belt pretensioner wiring of the driver low is shorted to ground. |
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 Handling Caution in the Preface section. Caution: Refer to Sensing and Diagnostic Module Voltage after Ignition is Turned Off Caution in the Preface section. | ||||
1 | Did you perform a Diagnostic System Check - Vehicle? | Go to Step 2 | ||
2 |
Has the SDM discharged? | -- | Go to Step 3 | -- |
3 | Visually inspect the connector and the wiring of the air bag. Is the air bag wiring damaged? | -- | Go to Step 6 | Go to Step 4 |
4 | Measure the resistance between the SDM and the high, low wiring of the driver belt pretensioner and the ground. Is the resistance equal to the specified value? | 10K ohms | Go to Step 5 | Go to Step 6 |
5 |
Is the DTC removed? | -- | Go to Step 8 | Go to Step 7 |
6 | Replace the air bag wiring. Is the replacement complete? | -- | Go to Step 8 | -- |
7 | Replace the driver belt pretensioner. Refer to Front Seat Belt Replacement . Is the replacement complete? | -- | Go to Step 8 | -- |
8 |
Does the DTC reset? | Go to Step 2 | System OK | |
