Instrument Cluster

Instrument cluster includes a speedometer, tachometer, fuel gauge, oil pressure gauge, water temperature gauge, voltmeter and a series of warning lights. Instrument cluster may also be referred to as Mechanical Instrument Cluster (MIC).

Powertrain Control Module (PCM) sends signals necessary for instrument cluster to position gauges. Instrument cluster receives these messages from CCD bus and translates them into gauge positions. Body Control Module (BCM) sends status of some indicator lights and dimming level to instrument cluster over CCD bus when ignition switch is in RUN or START positions. Other indicator lights are hard-wired directly to system being monitored. Malfunction indicator light (CHECK ENGINE) status is sent to BCM from PCM over CCD bus. All other instrument cluster features only work when the ignition switch is in the RUN position. Vehicle chime function and rear window defogger timer are part of instrument cluster circuit board.

Vacuum Florescent (VF) odometer/trip display works when ignition switch is in RUN or START positions. BCM stores mileage information for odometer display. If CCD bus is not functioning, odometer will display dashes instead of mileage. BCM sends mileage message and dimming level message to vacuum fluorescent display when ignition switch is in the RUN position. PCM Diagnostic Trouble Codes (DTC) can be accessed using VF display by turning ignition switch from off to on position 3 times.

Instrument cluster indicators controlled by CCD bus are as follow:

Air Bag
Cruise Control
Low Fuel Warning
Low Washer Fluid
Upshift
Seat Belt
Sentry Key Immobilizer
Engine Temperature
Battery Charge
Low Oil Pressure

Instrument cluster indicators hard-wired to monitored system are as follow:

Brake
Full Time 4WD
Part Time 4WD
High Beam
Left Turn Signal
Right Turn Signal
Liftgate Ajar
ABS
Check Engine