Test O: DTC B1868 - Lamp Air Bag Warning Indicator Circuit Failure

PINPOINT TEST O: DTC B1868 - LAMP AIR BAG WARNING INDICATOR CIRCUIT FAILURE

O1-O3:

O3-O4:

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.

Possible Causes
An lamp air bag warning indicator circuit failure can be caused by:
- a faulted instrument cluster.
- a faulted RCM.