Test E: LFC 46/DTC B1877/B1885 - Driver Pretensioner Circuit Resistance High or Low
PINPOINT TEST E: LFC 46/ DTC B1877/B1885 - DRIVER PRETENSIONER CIRCUIT RESISTANCE HIGH OR LOWE1:
E2-E4:
E4-E6:
NOTE: There is no restraint system diagnostic tool for the safety belt buckle pretensioners. If the ignition switch is turned to the RUN or START position with the safety belt buckle pretensioner electrical connector(s) disconnected, the diagnostic trouble code (DTC) for an open circuit will be activated.
Normal Operation
The restraints control module (RCM) monitors the resistance of the circuit to the driver safety belt pretensioner for faults. If the RCM detects a resistance out of range on the driver safety belt pretensioner circuits, it will store DTC B1877 or B1885 in memory and flash, depending on the fault indicator; and lamp fault code (LFC) 46 depending on the fault (or higher priority code if one exists) on the air bag indicator.
Fault Conditions
The RCM monitors for the following fault conditions:
- Low resistance
- High resistance
- Circuit open
Possible Causes
A safety belt pretensioner fault can be caused by:
- damaged wiring, terminals or connectors.
- a faulted pretensioner.
- a faulted RCM.