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. If the resistance is between 2-10 kilo ohms, the defect may occur depending upon the SDM. The normal resistance is over 10 kilo ohms.
Conditions for Setting the DTC
| • | The belt pretensioner wiring of the driver high is shorted to ground. |
| • | The belt pretensioner wiring of the driver 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 air bag. Is the air bag wiring damaged? | -- | Go to Step 5 | Go to Step 3 |
3 | Measure the resistance between the SDM and the high, low wiring of the driver belt pretensioner and the ground. Is the resistance equal to the specified value? | 10 K 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? | -- | -- | |
