Test P: LFC 21/DTC B1933 - Air Bag Passenger Circuit Open

PINPOINT TEST P: LFC 21/DTC B1933 - AIR BAG PASSENGER CIRCUIT OPEN

P1-P3:

P3-P5:

P6:

Normal Operation
The restraints control module (RCM) monitors the resistance of the passenger air bag ignitor by measuring the resistance between RCM C310a pins 3 and 4. If the RCM detects high resistance between these pins, it will store a diagnostic trouble code (DTC) B1933 in memory and flash lamp fault code (LFC) 21 (or higher priority code if one exists) on the air bag warning indicator.

Possible Causes
A passenger air bag high resistance could be caused by:
- faulted wiring, terminals or connectors.
- a faulted passenger air bag module.
- a faulted RCM.