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 passenger side air bag deployment loop is over 2.8 ohms.
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 | Examine the wiring and the connector at the passenger side air bag module. Is the connector disconnected? | -- | Go to Step 3 | Go to Step 4 |
3 | Connect the passenger side air bag module connector. Did you complete the repair? | -- | -- | |
4 |
Is the resistance as specified? | 0 ohms | Go to Step 5 | Go to Step 7 |
5 |
Is DTC 056 still shown as a current fault? | -- | Go to Step 6 | System OK |
6 | Replace the passenger side air bag module. Did you complete the repair? | -- | -- | |
7 | Replace the supplemental inflatable restraints (SIR) wiring harness. Did you complete the repair? | -- | -- | |
