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.
Conditions for Setting the DTC
| • | The resistance of the driver belt pretensioner deploy 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 |
Has the SDM discharged? | -- | Go to Step 2 | -- |
2 | Visually inspect the connector and the wiring of the driver belt pretensioner. Is the wiring damaged? | -- | Go to Step 5 | Go to Step 3 |
3 |
Is the resistance equal to the specified value? | ∞ ohms | Go to Step 4 | Go to Step 5 |
4 |
Is the DTC removed? | -- | Go to Step 6 | |
5 | Replace the air bag wiring. Is the replacement complete? | -- | -- | |
6 | Replace the driver belt pretensioner. Refer to Front Seat Belt Replacement in Seat Belts. Is the replacement complete? | -- | -- | |
