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.
Upon passing this test, ignition and deployment loop voltages are measured to ensure they are within the 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 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 then 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 | Did you perform the Diagnostic System Check - SIR? | -- | Go to Step 2 | |
2 | Visually inspect the connector and the wiring of the passenger side air bag module Is the wiring damaged? | -- | Go to Step 6 | Go to Step 3 |
3 |
Is the resistance as specified? | ∞ | Go to Step 4 | Go to Step 6 |
4 |
Is DTC 057 still shown as a current fault? | -- | Go to Step 5 | System OK |
5 | Replace the passenger side air bag module. Did you complete the repair? | -- | -- | |
6 | Replace the supplemental inflatable restraints (SIR) wiring harness. Did you complete the repair? | -- | -- | |
