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.
This diagnostic procedure supports the following DTC:
DTC B1482 Driver Frontal Deployment Loop Stage 2 Resistance Below Threshold
Ignition voltage is within the normal operating voltage range.
• | The resistance of the driver air bag deployment loop is lower than 1.8 ohms. |
• | The shorting bar is damaged and the SDM must be replaced. |
The SDM commands the AIR BAG indicator ON.
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 | Visually inspect the connector and the wiring of the driver air bag. Is the air bag wiring damaged? | -- | Go to Step 6 | Go to Step 3 |
3 |
Is the resistance equal to the specified value? | 0 ohms | Go to Step 4 | Go to Step 5 |
4 |
Is the DTC removed? | -- | System OK | Go to Step 8 |
5 |
Is the resistance equal to the specified value? | 0 ohms | Go to Step 7 | Go to Step 6 |
6 | Replace the air bag wiring. Is the replacement complete? | -- | Go to Step 9 | -- |
7 | Replace the steering wheel module coil. Refer to Inflatable Restraint Steering Wheel Module Coil Replacement . Is the replacement complete? | -- | Go to Step 9 | -- |
8 | Replace the steering wheel module. Refer to Inflatable Restraint Steering Wheel Module Replacement . Is the replacement complete? | -- | Go to Step 9 | -- |
9 |
Does the DTC reset? | -- | Go to Step 2 | System OK |