Test E
PINPOINT TEST E: LFC 46/DTC B1877/B1885 - DRIVER PRETENSIONER CIRCUIT RESISTANCE HIGH OR LOWTest E1:
Test E2-E4:
Test E4-E6:
Normal Operation
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 DTC for an open circuit will be activated.
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 diagnostic trouble code (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.