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 checks 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 belt pretensioner deploy loop is over 3.1 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 | Perform the Diagnostic System Check - SIR. Did you perform the Diagnostic System Check - SIR? | -- | Go to Step 2 | |
2 |
Does the ohmmeter show the specified value? | ∞ | Go to Step 3 | Go to Step 5 |
3 |
Is DTC 009 still shown as a current fault? | -- | Go to Step 4 | System OK |
4 |
Did you complete the repair? | -- | -- | |
5 |
Did you complete the repair? | -- | -- | |
