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 deployment loops.
This diagnostic procedure supports the following DTCs:
DTC B1409 LF Side Impact Sensor Invalid Serial Data Received
Ignition voltage is within the normal operating voltage range.
A communication error occurs between the SDM and the driver side impact sensor.
The SDM commands the AIR BAG indicator ON.
The condition responsible for setting the DTC no longer exists and the scan tool Clear DTCs function is used.
Step | Action | Yes | No |
---|---|---|---|
Schematic Reference: SIR Schematics Connector End View Reference: SIR Connector End Views Caution: Refer to Sensing and Diagnostic Module Handling Caution in the Preface section. Caution: Refer to Sensing and Diagnostic Module Voltage after Ignition is Turned Off Caution in the Preface section. | |||
1 | Did you perform a Diagnostic System Check - Vehicle? | Go to Step 2 | |
2 |
Has the SDM discharged? | Go to Step 3 | -- |
3 | Visually inspect any damage for the driver side impact sensor wiring. Is the driver side impact sensor wiring damaged? | Go to Step 4 | Go to Step 5 |
4 | Replace the air bag wiring. Is the replacement complete? | Go to Step 7 | -- |
5 |
Is the DTC removed? | Go to Step 7 | Go to Step 6 |
6 | Replace the SDM. Refer to Inflatable Restraint Sensing and Diagnostic Module Replacement . Is the replacement complete? | Go to Step 7 | -- |
7 |
Does the DTC reset? | Go to Step 2 | System OK |