Jeep 1997 Grand Cherokee Service Manual page 1372

8W - 49 - 4
DESCRIPTION AND OPERATION
OVERHEAD CONSOLE
When the ignition switch is in the RUN position, it
connects circuit A1 from fuse 8 in the Power Distri-
bution Center (PDC) to circuit A22. Circuit A22 pow-
ers circuit F83 through fuse 6 in the junction block.
Circuit F83 supplies power to the overhead console.
The Body Control Module (BCM) broadcasts the
park lamp signal and instrument panel illumination
lamp intensity signal on the CCD bus. The overhead
console receives the signals over the CCD bus and
calculates display illumination intensity.
The overhead console receives the fuel percentage
and distance information on the CCD bus from the
Powertrain Control Module (PCM).
8W - 49 OVERHEAD CONSOLE
8W-49 OVERHEAD CONSOLE
The overhead console contains a US/Metric switch.
The switch selects which units to show on the dis-
play. The overhead console broadcasts the US/Metric
selection on the CCD bus.
OVERHEAD CONSOLE LAMPS
Circuit A7 from fuse 15 in the Power Distribution
Center (PDC) powers circuit M1 through fuse 16 in
the junction block. Circuit M1 feeds the overhead
console lamps.
Each overhead console lamp has a switch that con-
nects the lamps to ground on circuit Z1. The lamps
are also grounded when the Body Control Module
(BCM) energizes the courtesy lamp relay to connect
circuit M2 to ground on circuit Z1.
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