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.
The 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 passenger side air bag module by letting the infinitesimal current flow through the internal circuit and verify the resistance.
Conditions for Setting the DTC
| • | The resistance of the driver side 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 Voltage after Ignition is Turned Off Caution in the Preface section. Caution: Refer to Sensing and Diagnostic Module Handling Caution in the Preface section. | ||||
1 | Perform the Diagnostic System Check - SIR. Is the Diagnostic System Check - SIR complete? | -- | Go to Step 2 | |
2 |
Does the ohmmeter show the specified value? | ∞ | Go to Step 4 | Go to Step 3 |
3 | Replace the air bag wiring. Is the repair complete? | -- | -- | |
4 |
Is DTC 057 still shown as a current fault? | -- | Go to Step 5 | |
5 | Replace the passenger side air bag module. Is the repair complete? | -- | -- | |
