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.
If the resistance is in the 2-10 kilo ohms range, the defect may occur, depending on the SDM. The normal resistance is over 10 kilo ohms.
Conditions for Setting the DTC
| • | The air bag wiring of the 2nd stage driver's high is shorted to ground. |
| • | The air bag wiring of the 2nd stage driver's low is shorted to ground. |
Step | Action | Values | Yes | No |
|---|---|---|---|---|
|
Caution: Refer to Sensing and Diagnostic Module Handling Caution in the Preface section. Caution: Refer to SRS Sensing and Diagnostic Module Handling Caution in the Preface section. | ||||
1 |
Has the SDM discharged? | -- | 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? | 10 K ohms | Go to Step 4 | Go to Step 5 |
4 |
Is the DTC removed? | -- | System OK | Go to Step 8 |
5 |
Is the resistance at or above the specified value? | 10 K ohms | Go to Step 7 | Go to Step 6 |
6 | Replace the air bag wiring. Is the replacement complete? | -- | -- | |
7 | Replace the clock spring. Refer to Inflatable Restraint Steering Wheel Module Coil Replacement . Is the replacement complete? | -- | -- | |
8 | Replace the driver air bag module. Refer to Inflatable Restraint Steering Wheel Module Replacement . Is the replacement complete? | -- | -- | |
