Diesel Data: Automotive Repair

Test F

PINPOINT TEST F: LFC 17/DTC B1878 - DRIVER PRETENSIONER CIRCUIT SHORTED TO BATTERY OR IGNITION


Test F1-F2:






Test F2-F3:






Test F4-F5:






Normal Operation
The restraints control module (RCM) monitors the circuit to the driver belt pretensioner When the RCM detects a circuit short to battery or ignition it will set lamp fault code (LFC) 17 and diagnostic test code (DTC) B1878.

Possible Causes
A short to battery or ignition on the driver belt pretensioner circuit can be caused by:
- a short to battery or ignition on circuit 30S-JA33 (RD/BU).
- a short to battery or ignition on circuit 31S-JA33 (BK/BU).
- a faulted RCM.