Test R: LFC 21/DTC B1935 - Passenger Air Bag Circuit Resistance Low

PINPOINT TEST R: LFC 21/DTC B1935 - PASSENGER AIR BAG CIRCUIT RESISTANCE LOW

R1-R3:

R3-R4:

R5-R7:

Normal Operation
The restraints control module (RCM) monitors the resistance of the passenger air bag ignitor by measuring the resistance between pins 3 and 4. If the RCM detects low resistance between these pins, it will store a diagnostic trouble code (DTC) B1935 in memory and flash lamp fault code (LFC) 21 (or higher priority code if one exists) on the air bag indicator.

Possible Causes
Passenger air bag low resistance could be caused by:
- wiring, terminals or connectors.
- a low resistance in the passenger air bag module.
- a faulted RCM.