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 | Perform the Diagnostic System Check - SIR. Did you perform the Diagnostic System Check - SIR? | -- | Go to Step 2 | |
2 | Inspect the fuse F1. Is the fuse open? | -- | Go to Step 3 | Go to Step 4 |
3 |
Did you complete the repair? | -- | -- | |
4 |
Does the voltage measure within the specified range? | 11-14 V | Go to Step 6 | Go to Step 5 |
5 | Repair the power supply to the fuse F1. Did you complete the repair? | -- | -- | |
6 |
Does the voltage measure within the specified range? | 11-14 V | Go to Step 7 | Go to Step 8 |
7 |
Did you complete the repair? | -- | -- | |
8 |
The connector C207 is the connector between the instrument harness and the supplemental inflatable restraints (SIR) harness. Does the voltage measure within the specified value? | 11-14 V | Go to Step 9 | Go to Step 10 |
9 |
Did you complete the repair? | -- | -- | |
10 | Repair the open circuit between the fuse F1 and the connector C207. Did you complete the repair? | -- | -- | |
