Grand Cherokee 2WD V8-4.7L VIN N (2000)
The exterior lighting switch uses a hard wired five volt reference circuit from the BCM, resistor multiplexing and a hard wired switch output
circuit in the instrument panel wire harness to provide the BCM with a zero to five volt signal that indicates the status of all of the exterior lighting
switch settings. The BCM then uses control outputs to energize the headlamp and park lamp relays that activate the exterior lighting circuits.
The BCM monitors the exterior lighting switch status, then sends the proper switch status messages to other electronic modules over the
Programmable Communications Interface (PCI) data bus network. The exterior lighting switch status is also used by the BCM as an input for
chime warning system operation.