Dimmable Backlighting

When the parking lamps are on, the Body Control Module (BCM) monitors the input from the instrument panel dimmer switch. The BCM sends voltage to the dimmable components based on input received from the instrument panel dimmer switch.

If a fault is detected by the BCM on the dimmable illumination output circuit, the BCM sets a DTC and disables the circuit function until the fault is cleared and an ignition cycle takes place.

The BCM also sends a message over the network to the Front Control/Display Interface Module (FCDIM) and the Instrument Panel Cluster (IPC) to control the backlighting intensity level.

If the receiving module does not receive the backlighting status message from the BCM, or if the data received is deemed invalid for more than 5 seconds, the receiving module sets a missing message related DTC in continuous memory and defaults the backlighting to full nighttime intensity.