Jeep 1996 Grand Cherokee Service Manual page 597

8W - 40 - 2
DESCRIPTION AND OPERATION (Continued)
HELPFUL INFORMATION
When the ignition switch is in the START or RUN
position, it connects circuit A1 from fuse 8 in the
Power Distribution Center (PDC) to circuit A21. Cir-
cuit A21 powers circuit F87 through fuse 5 in the
junction block.
OIL PRESSURE GAUGE
The instrument cluster micro-processor calculates
engine oil pressure gauge needle position based on
the oil pressure data received over the CCD bus. The
Powertrain Control Module (PCM) transmits the
data over the CCD bus.
HIGH BEAM INDICATOR LAMP
The micro-processor in the instrument cluster
switches the high beam indicator lamp ON and OFF
through a transistor in lamps ground circuit. The
Body Control Module (BCM) signals the instrument
cluster micro-processor over the CCD bus to turn the
high beam indicator ON or OFF. Circuit F75 powers
the lamp.
8W - 40 INSTRUMENT CLUSTER
TURN SIGNAL INDICATOR LAMPS
Circuits L65 and L64 from the turn signal/hazard
flasher circuitry in the multi-function switch power
the turn signal indicator lamps. Circuit L64 powers
the right turn signal indicator lamp. Circuit L65
powers the left indicator lamp. Circuits Z1 and Z2
provide ground for the lamps.
ILLUMINATION LAMPS
Circuit E2 from the headlamp switch powers the
illumination lamps in the instrument cluster. Cir-
cuits Z1 and Z2 provide ground for the lamps.
SCHEMATICS AND DIAGRAMS
WIRING DIAGRAM INDEX
The following index covers all components found in
this section of the wiring diagrams. If the component
you are looking for is not found here, refer to section
8W-02 for a complete list of all components shown in
the wiring diagrams.
ZJ