Fog Lamp Indicator; Diagnosis And Testing - Front/Rear Fog Lamp Indicator; Description; Operation - Jeep Wrangler 2001 Service Manual

8Js - 22 INSTRUMENT CLUSTER

FOG LAMP INDICATOR

DESCRIPTION

A fog lamp indicator is standard equipment on all
instrument clusters, but is only functional on vehi-
cles equipped with the optional front and/or rear fog
lamps. The fog lamp indicator is located near the
upper edge of the instrument cluster overlay, in the
upper left quadrant of the cluster. The fog lamp indi-
cator consists of a stencil-like cutout of the Interna-
tional Control and Display Symbol icon for "Fog
Lamps" in the opaque layer of the instrument cluster
overlay. The dark outer layer of the overlay prevents
the indicator from being clearly visible when it is not
illuminated. A green lens behind the cutout in the
opaque layer of the overlay causes the indicator to
appear in green through the translucent outer layer
of the overlay when it is illuminated from behind by
a Light Emitting Diode (LED) soldered onto the
instrument cluster electronic circuit board. The fog
lamp indicator is serviced as a unit with the instru-
ment cluster.

OPERATION

The fog lamp indicator gives an indication to the
vehicle operator when the optional front and/or rear
fog lamps are turned On. The availability of the front
fog lamps, or rear fog lamps options varies by the
market for which the vehicle is manufactured. This
indicator is controlled by a hard wired input from the
fog lamp switch circuitry of the left multi-function
switch to the cluster. The fog lamp indicator Light
Emitting Diode (LED) is grounded on the instrument
cluster electronic circuit board at all times; therefore,
the LED will be on anytime the front or rear fog
lamps are turned on, regardless of the ignition switch
position. The LED only illuminates when it is pro-
vided battery current by the fog lamp switch cir-
cuitry of the left multi-function switch.
The fog lamp switch circuitry of the left multi-func-
tion switch is connected in series between a fused
B(+) fuse in the Power Distribution Center (PDC)
and the front or rear fog lamp feed input to the
instrument cluster through the fog lamp relay, which
is also in the PDC. The fog lamp switch input to the
instrument cluster can be diagnosed using conven-
tional diagnostic tools and methods. (Refer to 8 -
ELECTRICAL/LAMPS/LIGHTING
LEFT MULTI-FUNCTION SWITCH - OPERATION)
for more information on the fog lamp switch.
2001 JEEP WRANGLER
DIAGNOSIS AND TESTING - FRONT/REAR FOG
LAMP INDICATOR
The diagnosis found here addresses an inoperative
front/rear fog lamp indicator condition. Before begin-
ning this test, confirm the functionality of the front
or rear fog lamp system. If no fog lamp system prob-
lem is found, the following procedure will help to
locate an open in the front or rear fog lamp feed cir-
cuit between the fog lamp relay and the instrument
cluster. Refer to the appropriate wiring information.
The wiring information includes wiring diagrams,
proper wire and connector repair procedures, details
of wire harness routing and retention, connector pin-
out information 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.
(1) Disconnect and isolate the battery negative
cable. Remove the instrument cluster from the
instrument panel. Disconnect the instrument panel
wire harness connector (Connector C1) for the instru-
ment cluster from the connector receptacle on the
back of the cluster housing.
(2) Reconnect the battery negative cable. Turn the
fog lamps on by pulling out the control knob on the
end of the left-multi-function switch control stalk.
Check for battery voltage at the front or rear fog
lamp feed circuit cavity of the instrument panel wire
harness connector (Connector C1) for the instrument
cluster. If OK, replace the faulty instrument cluster.
If not OK, repair the open front or rear fog lamp feed
circuit between the fog lamp relay and the instru-
ment cluster as required.
- EXTERIOR/
TJ