P: LFC 14/DTC B1901- External Crash Sensor Short to Ground

Normal Operation
The external crash sensors monitor the severity of a crash event. If the crash event is severe enough, the sensor(s) will close and signal the Electronic Crash Sensor (ECS) module to deploy the air bags. The external crash sensor contains a 787 ohm resistor.

The ECS measures this resistance to verify that the crash sensors are correctly mounted and connected. If there is a short to ground on circuit 619 (PK/WH), the ECS will store a Diagnostic Trouble Code (DTC) B1901 in memory and flash a Lamp Fault Code (LFC) 14 (or higher priority code if one exists) on the air bag indicator.


Possible Causes
An external crash sensor short to ground condition can be caused by:
- a short to ground on circuit 619 (PK/WH).
- a damaged or inoperative external crash sensor.

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