Lighting and Horns: Description and Operation

EXTERIOR LIGHTING
The Headlamps are controlled by the Instrument Cluster. The Instrument Cluster is also referred to as a "Smart Cluster". It receives and sends messages to other modules through the PCI BUS circuit. The Headlamps are wired through the cluster and then go to the Fuse Block to the lamps. Each Headlamp has an independent fuse located in the Fuse Block. For vehicles equipped with Daytime Running Lamps, the DRL Module is integrated with the Instrument Cluster.

INTERIOR LIGHTING
The Courtesy Lamps are controlled by the instrument cluster. The instrument cluster is sometimes referred to as a "Smart Cluster Control Module". Some of the features that it controls are the courtesy lamps, chime, and all instrument illumination. It receives and sends messages to other modules via the PCI bus circuit. The front turn signals are wired through the cluster and then go to the front lamps. For vehicles equipped with Daytime Running Lamps, the DRL module is built into the cluster.