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.
Conditions for Setting the DTC
| • | 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. |
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 been discharged? | -- | Go to Step 2 | -- |
2 | Visually inspect the connector and the wiring of 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? | -- | Go to Step 8 | |
5 |
Is the resistance equal to the specified value? | ∞ | Go to Step 6 | Go to Step 7 |
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? | -- | -- | |
