Test H: LFC 17/DTC B1878 or B1879 - Driver Pretensioner Circuit Short to Batt./Driver Pretensioner Circuit Short to Gnd.

H1:

H2:

H3:

H4 - H5:

H5 - H6:

H7:

Normal Operation
The Restraints Control Module (RCM) checks for driver pretensioner circuit shorts to battery and ground by monitoring circuits 1079 (LG/RD) and 1080 (LG/BK) at RCM C310b pins 15 and 16. If the RCM detects a short to battery or ground on either of these pins, it will store Diagnostic Trouble Code (DTC) B1878 or B1879 in memory and flash Lamp Fault Code (LFC) 17 (or higher priority code if one exists) on the air bag indicator.

Possible Causes
A driver pretensioner circuit short to battery or ground can be caused by:
^ a short to battery or ground on circuit 1079 (LG/RD).
^ a short to battery or ground on circuit 1080 (LG/BK).
^ a short to battery or ground in the driver pretensioner.
^ an RCM internal concern.