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.
These 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 battery by letting the perpetual 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 system 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 Handling Caution in the Preface section. Caution: Refer to SRS Sensing and Diagnostic Module Handling Caution in the Preface section. | ||||
1 | Inspect fuse F1. Is the fuse blown? | -- | Go to Step 2 | Go to Step 3 |
2 | Replace fuse F1. Is the replacement complete? | -- | Go to Step 1 | -- |
3 |
Is the voltage equal to the specified value? | 10.6 V | Go to Step 5 | Go to Step 4 |
4 | Repair the power supply and the wiring to fuse F1. Is the repair complete? | -- | -- | |
5 |
Is the voltage equal to the specified value? | 10.6 V | Go to Step 8 | Go to Step 6 |
6 |
Is the voltage equal to the specified value? | 10.6 V | Go to Step 9 | Go to Step 7 |
7 | Repair the wire between the fuse F1 and the terminal 1 of connector C207. Is the repair complete? | -- | -- | |
8 | Replace the SDM. Refer to Inflatable Restraint Sensing and Diagnostic Module Replacement . Is the replacement complete? | -- | -- | |
9 | Replace the air bag wiring. Is the replacement complete? | -- | -- | |
