Normal Operation

During normal operation, the air bag warning indicator will illuminate continuously for approximately 6 seconds and then go out after the ignition switch is placed in the ON position and no air bag fault exists. Control of the air bag warning indicator is a function of the instrument cluster module based on information it receives from the restraints control module (RCM) over the HS-CAN. The default mode for the air bag warning indicator is on. The RCM sends a message to the instrument cluster module to turn the indicator off if no air bag fault exists. If the RCM detects a problem with the supplemental restraints system it will send a message to the instrument cluster module to turn the air bag indicator warning lamp on.

If the instrument cluster module detects a problem with the air bag warning indicator it will send a fault message to the RCM and the RCM will store diagnostic trouble code (DTC) B1868 in memory.