Instrument Cluster Description

The instrument cluster for Jeep Cherokee (XJ) is available in two different versions: base with two gauges, and premium with six gauges. The gauges are positioned with information received by the cluster over the CCD bus from the PCM. Some of the warning lamps are hardwired; and some are controlled by the cluster, using CCD bus information. The vehicle chime function is contained on the cluster circuit board, as well as the timer for the rear window defogger. There is a self-test available for the cluster that will actuate all the gauges and place them at their calibration points. The test will not run if the cluster sees engine RPM or vehicle speed. This test will light all CCD controlled lamps for verification of lamp operation. It also forces the odometer Vacuum Fluorescent (VF) display to count up from all zero's through all nine's. The self-test routine can be entered by pushing and holding the trip reset button, while rotating the ignition key from the "OFF" to the "ON" position, release the button after the ignition key cycle.

The VF display is also capable of displaying PCM DTC's, This feature is accessed the same as in previous years by turning the key from "OFF" to "run" three times and staying in position.

The instrument cluster will provide bus bias and termination and the PCM controller provides a second termination. If cluster is disconnected, the bus will not be biased.

The cluster will be serviced as an assembly. There will be limited parts available: bulbs and sockets, the front lens, the trip odometer stem cover and the hood and rear cover assembly. No internal parts of the lowline or highline cluster will be serviced.

Normal Operation: At key "ON", the cluster will light the low fuel, oil pressure, temperature battery, seat belt, check gauges and airbag lamps. The check engine, ABS, and SKIM lamps are bulb tested by their system modules. As the key is turned farther toward the start position, the brake warning lamp will illuminate. The Vacuum Fluorescent (VF) display will indicate the mileage stored inside the cluster. If there is a bus failure and the cluster cannot receive distance pulses from the engine controller, the cluster will display the last mileage stored until the ignition key is turned OFF. If the cluster is receiving bus messages, but is unable to display odometer information because of an internal failure, the odometer display dashes. VF dimming is handled by the potentiometer that controls instrumentation illumination.