Normal Operation
WARNING: This page is about a different car, the 2010 Lincoln Town Car. However, it is still accessible from the selected car via links, so may be relevant.
The restraints control module (RCM) monitors the resistance between the case ground and the reference ground at C310a pin 16, circuit 676 (PK/OG).
If the RCM detects a difference in resistance, it will store DTC B1921 in memory and flash LFC 1-4 on the air bag warning indicator.
This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- RCM not securely mounted
- RCM