Test D: LFC 33/DTC B1877/B1885 - Seatbelt Driver Pretensioner Circuit Open or Resistance Low on Squib

PINPOINT TEST D: LFC 33/DTC B1877/B1885 - SEATBELT DRIVER PRETENSIONER CIRCUIT OPEN OR RESISTANCE LOW ON SQUIB

D1-D3:

D3-D4:

D5-D6:

Normal Operation
The safety belt pretensioners are activated by the restraints control module (RCM) to remove excessive slack from the safety belt webbing when an impact exceeding preprogrammed limits is detected.

The RCM monitors the resistance of the circuit to the driver safety belt pretensioner for faults. If the RCM detects an open or resistance out of range on the driver safety belt pretensioner circuits, it will store diagnostic trouble code (DTC) B1877 or B1885 in memory and flash lamp fault code (LFC) 33 (or higher priority code if one exists) on the air bag warning indicator.

Fault Conditions
The RCM monitors for the following fault conditions:
- Low resistance
- High resistance or circuit open

Possible Causes
A safety belt pretensioner fault can be caused by:
- faulted wiring, terminals or connectors.
- a faulted pretensioner.
- a faulted RCM.