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TJ
INSTRUMENT CLUSTER (Continued)
INSTALLATION
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.
(1) Position the instrument cluster to the instru-
ment panel.
(2) Reconnect the two instrument panel wire har-
ness connectors for the instrument cluster to the con-
nector to the connector receptacles on the back of the
cluster housing (Fig. 2).
(3) Position the instrument cluster to the instru-
ment panel structural support.
(4) Install and tighten the four screws that secure
the instrument cluster to the instrument panel struc-
tural support. Tighten the screws to 2.2 N·m (20 in.
lbs.).
(5) Reinstall the cluster bezel onto the instrument
panel. (Refer to 23 - BODY/INSTRUMENT PANEL/
CLUSTER BEZEL - INSTALLATION).
(6) Reconnect the battery negative cable.
NOTE: Some of the indicators in a new instrument
cluster are automatically configured (airbag, cruise,
and Sentry Key Immobilizer System indicators)
when the cluster is connected to the vehicle electri-
cal system. This feature allows those indicators to
be automatically enabled for compatibility with cer-
tain optional equipment.
ABS INDICATOR
DESCRIPTION
An Antilock Brake System (ABS) indicator is stan-
dard equipment on all instrument clusters, but is
only functional on vehicles equipped with the ABS
option. The ABS indicator is located near the lower
edge of the instrument cluster overlay, to the left of
the odometer/trip odometer Vacuum-Fluorescent Dis-
play (VFD). The ABS indicator consists of a stencil-
like cutout of the International Control and Display
Symbol icon for "Failure of Anti-lock Braking Sys-
tem" in the opaque layer of the instrument cluster
2001 JEEP WRANGLER
overlay. The dark outer layer of the overlay prevents
the indicator from being clearly visible when it is not
illuminated. An amber lens behind the cutout in the
opaque layer of the overlay causes the icon to appear
in amber through the translucent outer layer of the
overlay when it is illuminated from behind by a
Light Emitting Diode (LED) soldered onto the instru-
ment cluster electronic circuit board. The ABS indi-
cator is serviced as a unit with the instrument
cluster.
OPERATION
The ABS indicator gives an indication to the vehi-
cle operator when the ABS system is faulty or inop-
erative. This indicator is hard wired on the
instrument cluster electronic circuit board, and is
completely controlled by the Controller Antilock
Brake (CAB). The ABS indicator Light Emitting
Diode (LED) receives battery current on the instru-
ment cluster electronic circuit board through the
fused ignition switch output (run-start) circuit when-
ever the ignition switch is in the On or Start posi-
tions; therefore, the LED will always be off when the
ignition switch is in any position except On or Start.
The LED only illuminates when it is provided a path
to ground by the CAB through the CAB relay in the
Power Distribution Center (PDC). The CAB continu-
ally monitors the ABS circuits and sensors to decide
whether the system is in good operating condition.
The indicator is turned on by the CAB for about two
seconds after the ignition switch is turned to the On
position as a bulb test. After the bulb test, the CAB
turns the indicator on or off based upon the results of
the ABS self-tests. If the CAB turns the indicator on
after the bulb test, it indicates that the CAB has
detected a system malfunction and/or that the ABS
system has become inoperative. (Refer to 5 -
BRAKES - DESCRIPTION). The ABS indicator can
be diagnosed using conventional diagnostic tools and
methods.
DIAGNOSIS AND TESTING - ABS INDICATOR
The diagnosis found here addresses an inoperative
Antilock Brake System (ABS) indicator condition. If
there are problems with several indicators in the
instrument cluster, (Refer to 8 - ELECTRICAL/IN-
STRUMENT CLUSTER - DIAGNOSIS AND TEST-
ING). If the ABS indicator stays on with the ignition
switch in the On position or comes on and stays on
while driving, (Refer to 5 - BRAKES - DIAGNOSIS
AND TESTING). If no ABS problem is found, the fol-
lowing procedure will help to locate a short or open
in the ABS indicator lamp circuit. Refer to the appro-
priate wiring information. The wiring information
includes wiring diagrams, proper wire and connector
repair procedures, details of wire harness routing
INSTRUMENT CLUSTER
8Js - 15
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Troubleshooting
