B1885
Pinpoint Test 30: LFC46/DTC B1877/B1885 - Driver Pretensioner Circuit Resistance High or LowNormal Operation
The restraints control module (RCM) monitors the resistance of the circuit to the driver safety belt buckle pre-tensioner. When the RCM detects a resistance that is out of the expected range (high or low) it will set lamp fault code (LFC) 46 and diagnostic test (DTC) B1877 or 1877.
Possible Causes
An out-of-range resistance on the drive safety belt buckle pretensioner circuit can be caused by:
- an out-of-range resistance on circuit (LG/R).
- an out-of-range resistance on circuit (LG/B).
- an out-of-range resistance on the driver pretensioner.
- an RCM internal concern.
WARNING: The air bag diagnostic tool is for restraint system repair only. Remove from vehicle prior to road use. Failure to remove could result in injury and possible violation of vehicle safety standards.
NOTE: It a seat equipped with a seat-mounted side air bag and/or a safety belt pretensioner (if equipped) system is being serviced, the air bag system must be deactivated using the appropriate deactivation procedure in this section.
NOTE: Restraint system diagnostic tools MUST be installed under the seats in the side air bag and safety belt pretensioner to floor connectors.
NOTE: Diagnostics or repairs are not to be performed on a side air bag system and/or a safety belt pretensioner (if equipped) system with the seats in the vehicle. Prior to attempting to diagnose/repair the side air bag system and/or safety belt pretensioner (if equipped) system the seats must be removed from the vehicle and the restraint system diagnostic tools must be installed in the side air bag and the safety belt pretensioner (if equipped) connectors at the floor connectors. The restraint system diagnostic tools must be removed prior to operating the vehicle over the road.
NOTE: Diagnostics may be performed on seat Systems other than the side air bag or the safety belt pretensioner (if equipped) system (lumbar, climate controlled, heated, power seat track) with the seat installed in the vehicle as long as the restraint system diagnostic tools are installed under the seats in the side air bag and safety belt pretensioner to floor connectors.
NOTE: After diagnosing/repairing a seat system, the restraint system diagnostic tools must be removed before operating the vehicle over the road.
Step 1 - 5:
TEST DESCRIPTION