Test H: LFC 14/DTC B1921 - Air Bag Diagnostic Monitor Ground Circuit Open

PINPOINT TEST H: LFC 14/DTC B1921 - AIR BAG DIAGNOSTIC MONITOR GROUND CIRCUIT OPEN

WARNING: Always tighten the fasteners of the restraints control module (RCM) and impact sensor (if equipped) to the specified torque. Failure to do so may result in incorrect restraint system operation, which increases the risk of personal injury or death in a crash.

NOTE: A resistance difference as low as 10 ohms may set the LFC.

Normal Operation
The restraints control module (RCM) monitors the resistance between the ground connections at the mounting bolts and the reference ground at C2041a pin 16, circuit 1203 (BK/LB). If the RCM detects a difference in resistance, it will store DTC B1921 in memory and flash LFC 14 (or higher priority code if one exists) on the air bag warning indicator.

- DTC B1921 Air Bag Diagnostic Monitor Ground Circuit Open - If the RCM detects a resistance difference between the case ground and pin 16 of C2041a, it will set this DTC.

This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- RCM not securely mounted
- RCM

H1-H2:

H2-H5:

H6: