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 side air bag module by letting the perpetual current flow through the internal circuit and verify the resistance.
Conditions for Setting the DTC
| • | The resistance of the driver air bag deployment loop is lower than 1.4 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 |
Is the resistance equal to the specified value? | ∞ | Go to Step 2 | Go to Step 4 |
2 |
Is the DTC removed? | -- | Go to Step 3 | |
3 | Replace the driver side air bag module. Is the replacement complete? | -- | -- | |
4 | Replace the air bag wiring. Is the replacement complete? | -- | -- | |
