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 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 air bag module by letting the infinitesimal current flow through the internal circuit and verify the resistance. If the voltage is out of range, the SDM is unable to inspect the air bag properly.
Conditions for Setting the DTC
The voltage supplied from the battery is lower than 10.6 volts.
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 |
Does the voltage measure greater than specified? | 10.6 V | Go to Step 4 | Go to Step 3 |
3 | Repair the power supply to the fuse F8. Did you complete the repair? | -- | -- | |
4 |
Is the voltage greater than specified? | 10.6 V | Go to Step 5 | Go to Step 6 |
5 | Replace the SDM. Refer to Inflatable Restraint Sensing and Diagnostic Module Replacement . Did you complete the repair? | -- | -- | |
6 |
Is the voltage greater than specified? | 10.6 V | Go to Step 7 | Go to Step 8 |
7 |
Did you complete the repair? | -- | -- | |
8 | Repair the open circuit between the fuse F8 and the terminal 6 of connector C213. Did you complete the repair? | -- | -- | |
