Normal Operation

WARNING: This page is about a different car, the 2010 Lincoln MKX and 2010 Ford Edge. However, it is still accessible from the selected car via links, so may be relevant.

During normal operation, the air bag warning indicator will illuminate continuously for approximately 6 seconds and then go out if no air bag fault exists. Control of the air bag warning indicator is a function of the Instrument Cluster (IC) module based on information it receives from the Restraints Control Module (RCM) over the High Speed Controller Area Network (HS-CAN). The default mode for the air bag warning indicator is on. The RCM sends a message to the IC module to turn the indicator off if no air bag fault exists. If the RCM detects a problem with the Supplemental Restraint System (SRS), it will send a message to the IC module to turn the air bag warning indicator on.

If the IC module detects a problem with the air bag warning indicator, it will send a fault message to the RCM and the RCM will store DTC B1868 in memory.

DTC B1868 (Lamp Air Bag Warning Indicator Circuit Failure) - If the RCM receives a message from the IC module of an air bag warning indicator failure, it will set this DTC.

This pinpoint test is intended to diagnose the following:

IC module
RCM