Test T

PINPOINT TEST T: LFC 21/DTC B1938 - PASSENGER AIR BAG CIRCUIT SHORTED TO GROUND

Test T1-T2:

Test T3-T4:

Test T5-T6:

Normal Operation
The restraints control module (RCM) checks for passenger air bag circuit shorts to ground by monitoring the voltage of circuits 607 (LB/OG) and 616 (PK/BK) at pins 3 and 4. If the RCM detects a short to ground on either of these pins, it will store a diagnostic trouble code (DTC) B1938 in memory and flash a lamp fault code (LFC) 21 (or higher priority code if one exists) on the air bag indicator.

Possible Causes
A passenger air bag circuit short to ground could be caused by:
- faulted wiring, terminals, or connectors.
- a short to ground on the passenger air bag module.
- a faulted RCM.