Grand Cherokee 4WD V8-4.7L VIN N (2000)
Transmission Shift Position Indicator Lamp: Description and Operation
Indicator lamps are located in the instrument cluster and are served by the cluster circuit board and connectors. Many of the indicator lamps in the
instrument cluster are controlled by the instrument cluster circuitry in response to messages received over the Programmable Communications Interface
(PCI) data bus network.
The part-time four-wheel drive indicator lamp and turn signal indicator lamps are hard wired. The seat belt reminder lamp is controlled by the instrument
cluster programming and by PCI data bus messages from the Body Control Module (PCM) based upon inputs from the seat belt switch. The brake
warning lamp is controlled by a hard wired input from the park brake switch and by PCI data bus messages from the Controller Anti-lock Brake (CAB).
The instrument cluster circuitry uses PCI data bus messages from the Powertrain Control Module (PCM), Airbag Control Module (ACM), BCM and
CAB to control all of the remaining indicator lamps.
The indicator lamps in the instrument cluster use incandescent bulbs and holders. Each incandescent indicator lamp has a replaceable bulb and bulb
holder.
The Transmission Range Indicator Lamp, mounted on the floor console, uses electroluminescent technology as the light source. This lamp requires a 120
volt AC signal that is provided by a power converter included as part of the assembly. The module is not serviceable separately. Because of a potential
shock hazard, diagnostic testing of the lamp assembly should be avoided. Refer to TRANSMISSION, Range Selector Assembly Removal and
Installation.
