in the part time indicator lamp control circuit. Refer
to the appropriate wiring information. The wiring
information includes wiring diagrams, proper wire
and connector repair procedures, details of wire har-
ness routing and retention, connector pin-out infor-
mation and location views for the various wire
harness connectors, splices and grounds.
WARNING: ON VEHICLES EQUIPPED WITH AIR-
BAGS, DISABLE THE AIRBAG SYSTEM BEFORE
ATTEMPTING ANY STEERING WHEEL, STEERING
COLUMN, OR INSTRUMENT PANEL COMPONENT
DIAGNOSIS OR SERVICE. DISCONNECT AND ISO-
LATE THE BATTERY NEGATIVE (GROUND) CABLE,
THEN WAIT TWO MINUTES FOR THE AIRBAG SYS-
TEM CAPACITOR TO DISCHARGE BEFORE PER-
FORMING FURTHER DIAGNOSIS OR SERVICE. THIS
IS THE ONLY SURE WAY TO DISABLE THE AIRBAG
SYSTEM. FAILURE TO TAKE THE PROPER PRE-
CAUTIONS COULD RESULT IN ACCIDENTAL AIR-
BAG DEPLOYMENT AND POSSIBLE PERSONAL
INJURY.
LAMP DOES NOT ILLUMINATE WITH PART TIME MODE
SELECTED
(1) Disconnect and isolate the battery negative
cable. Disconnect the engine wire harness connector
for the transfer case switch from the transfer case
switch connector receptacle. Check for continuity
between the ground circuit cavity of the engine wire
harness connector for the transfer case switch and a
good ground. There should be continuity. If OK, go to
Step 2. If not OK, repair the open ground circuit to
ground (G104) as required.
(2) Reconnect the battery negative cable. Turn the
ignition switch to the On position. Install a jumper
wire between the part time 4 wheel drive indicator
driver circuit cavity of the engine wire harness con-
nector for the transfer case switch and a good
ground. The part time indicator lamp should light. If
OK, replace the faulty transfer case switch. If not
OK, go to Step 3.
(3) Turn the ignition switch to the Off position.
Disconnect and isolate the battery negative cable.
Remove the instrument cluster from the instrument
panel. Check for continuity between the part time 4
wheel drive indicator driver circuit cavities of the
instrument panel wire harness connector for the
instrument cluster and the engine wire harness con-
nector for the transfer case switch. There should be
continuity. If OK, replace the faulty part time indica-
tor lamp bulb. If not OK, repair the open part time 4
wheel drive indicator driver circuit between the
instrument cluster and the transfer case switch as
required.
LAMP STAYS ILLUMINATED WITH PART TIME MODE NOT
SELECTED
(1) Disconnect and isolate the battery negative
cable. Disconnect the engine wire harness connector
for the transfer case switch from the switch connec-
tor receptacle. Check for continuity between the
ground circuit and the part time 4 wheel drive indi-
cator driver circuit terminals in the transfer case
switch connector receptacle. There should be no con-
tinuity. If OK, repair the shorted part time 4 wheel
drive indicator driver circuit between the transfer
case switch and the instrument cluster as required.
If not OK, replace the faulty transfer case switch.
SPEEDOMETER
DESCRIPTION
A speedometer is standard equipment on all instru-
ment clusters. The speedometer is located just to the
right of the tachometer near the center of the instru-
ment cluster. The speedometer consists of a movable
gauge needle or pointer controlled by the instrument
cluster circuitry and a fixed 210 degree primary scale
on the gauge dial face that reads left-to-right either
from 0 to 125 mph, or from 0 to 230 km/h, depending
upon the market for which the vehicle is manufac-
tured. Each version also has a secondary inner scale
on the gauge dial face that provides the equivalent
opposite units from the primary scale. Text appearing
in the center of the gauge dial face just beneath the
hub of the speedometer needle abbreviates the unit
of measure for the primary scale in all upper case
letters (i.e.: MPH or KM/H), followed by the unit of
measure for the secondary scale in all lower case let-
ters (i.e.: mph or km/h). The odometer/trip odometer
Vacuum-Fluorescent Display (VFD) on the instru-
ment
cluster
electronic
circuit
board
is
visible
through a dedicated rectangular cutout near the cen-
ter of the lower edge of the gauge dial face. The
speedometer graphics are either white and red
against a black gauge dial face (Laredo), or blue-
green and red against a brushed aluminum gauge
dial face (Limited), making them clearly visible
within the instrument cluster in daylight. When illu-
minated from behind by the panel lamps dimmer
controlled cluster illumination lighting with the exte-
rior lamps turned On, the white graphics (Laredo)
appear blue-green, the blue-green graphics (Limited)
still appear blue-green, while the red graphics for
both models still appear red. The orange gauge nee-
dle is internally illuminated. Gauge illumination is
provided by replaceable incandescent bulb and bulb
holder units located on the instrument cluster elec-
tronic circuit board. The speedometer is available for
individual service replacement.
WG
INSTRUMENT CLUSTER
8Js - 23
SHIFT INDICATOR (TRANSFER CASE) (Continued)
2001 JEEP GRAND CHEROKEE