O: LFC 41/DTC B1941-Front Ext Crash Sen. Open Ckt/Short to Batt

Normal Operation
The front 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 Restraints Control Module (RCM) to deploy the air bags. Each front external crash sensor contains a 1590 ohm resistor. Since the two crash sensors are connected in parallel through the splice in circuit 619 (PK/WH), the RCM normally measures about 790 ohms.

The RCM measures this resistance to verify that the crash sensors are correctly mounted and connected. If there is a short to battery or an open on circuit 619 (PK/WH), the RCM will store a Diagnostic Trouble Code (DTC) B1941 in memory and flash a Lamp Fault Code (LFC) 41 (or higher priority code is one exists) on the air bag indicator.

Possible Causes
A front external crash sensor open circuit or short to battery fault can be caused by:
- damaged wiring on circuit 619 (PK/WH).
- damaged front external crash sensor.
- a short to battery on circuit 619 (PK/WH).
- an RCM internal concern.

Pinpoint Test Steps:

O1:

O2 - O3:

O4 - O5:

O6: