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 these tests, 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.
DTC Descriptor
This diagnostic procedure supports the following DTC:
DTC B1402 LF Side Impact Sensor Short to Battery
Conditions for Running the DTC
Ignition voltage is within the normal operating voltage range.
Conditions for Setting the DTC
| • | The side impact sensor wiring of the driver high is shorted to battery wiring. |
| • | The side impact sensor wiring of the driver low is shorted to battery wiring. |
Action Taken When the DTC Sets
The SDM commands the air bag indicator ON.
Conditions for Clearing the DTC
The condition responsible for setting the DTC no longer exists and the scan tool Clear DTCs function is used.
Step | Action | Values | Yes | No |
|---|---|---|---|---|
|
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. Schematic Reference: SIR Schematics Connector End View Reference: SIR Connector End Views | ||||
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 and the connector. Are the driver side impact sensor wiring and connector OK? | -- | Go to Step 5 | Go to Step 4 |
4 | Connect the connector or repair the damage. Is the action complete? | -- | Go to Step 10 | -- |
5 |
Is the resistance equal to the specified value? | 0 ohms | Go to Step 6 | Go to Step 9 |
6 | Measure the resistance between the high, low terminal of the driver side impact sensor connector and battery positive. Is the resistance greater than the specified value? | 4.5K ohms | Go to Step 7 | Go to Step 9 |
7 |
Is the DTC removed? | -- | Go to Step 10 | Go to Step 8 |
8 | Replace the driver side impact sensor. Refer to Inflatable Restraint Side Impact Sensor Replacement . Is the replacement complete? | -- | Go to Step 10 | -- |
9 | Replace the air bag wiring. Is the replacement complete? | -- | Go to Step 10 | -- |
10 |
Does the DTC reset? | Go to Step 2 | System OK | |
