Jeep Wrangler TJ. Manual - part 311

COMBINATION FLASHER

DESCRIPTION

The combination flasher is located to the back of

the left multi-function switch housing on the top of
the steering column, where it is concealed beneath
the upper steering column shroud (Fig. 5). The com-
bination flasher is a smart relay that functions as
both the turn signal system and the hazard warning
system flasher. The combination flasher contains
active electronic Integrated Circuitry (IC) elements.
This flasher is designed to handle the current flow
requirements of the factory-installed lighting. If sup-
plemental lighting is added to the turn signal lamp
circuits, such as when towing a trailer with lights,
the combination flasher will automatically try to
compensate to keep the flash rate the same.

The combination flasher cannot be repaired or

adjusted and, if faulty or damaged, it must be
replaced.

OPERATION

Constant battery voltage is supplied to the flasher

so that it can perform the hazard warning function,
and ignition switched battery voltage is supplied for
the turn signal function. The Integrated Circuit (IC)
within the combination flasher contains the logic that
controls the flasher operation and the flash rate. The
IC receives sense ground inputs from the multi-func-
tion switch for the hazard flasher, right turn signal,
and left turn signal. A special design feature of the
combination flasher allows it to

9sense9 that a turn

signal circuit or bulb is not operating, and provide
the driver an indication of the condition by flashing
the remaining bulbs in the affected circuit at a
higher rate.

Because of the active elements within the combina-

tion flasher, it cannot be tested with conventional
automotive electrical test equipment. If the combina-
tion flasher is believed to be faulty, test the turn sig-
nal and hazard warning system prior to replacement.
Refer to (Refer to 8 - ELECTRICAL/LAMPS/LIGHT-
ING - EXTERIOR - DIAGNOSIS AND TESTING).

REMOVAL

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.

(2) Remove the steering column cover from the

instrument panel. (Refer to 23 - BODY/INSTRU-
MENT

PANEL/STEERING

COLUMN

OPENING

COVER - REMOVAL).

(3) Remove the screws that secure the lower steer-

ing column shroud to the upper shroud (Fig. 6).

(4) Move the tilt steering column to the fully low-

ered position and leave the tilt release lever in the
released position.

(5) Remove the upper shroud from the steering col-

umn.

Fig. 4 CHMSL Lamp

1 - SOCKET
2 - CHMSL LENS
3 - LAMP

Fig. 5 Combination Flasher

1 - COMBINATION FLASHER
2 - LEFT MULTI-FUNCTION SWITCH

LAMPS/LIGHTING - EXTERIOR

8L - 9

CENTER HIGH MOUNTED STOP LAMP (Continued)

(6) Grasp the combination flasher firmly and pull

it toward the dash panel to disengage the flasher ter-
minals. (Fig. 7).

(7) Remove the combination flasher.

INSTALLATION

WARNING: ON VEHICLES EQUIPPED WITH AIR-
BAGS, DISABLE THE AIRBAG SYSTEM BEFORE
ATTEMPTING ANY STEERING WHEEL, STEERING
COLUMN, SEAT BELT TENSIONER, OR INSTRU-
MENT PANEL COMPONENT DIAGNOSIS OR SER-
VICE. DISCONNECT AND ISOLATE THE BATTERY
NEGATIVE (GROUND) CABLE, THEN WAIT TWO
MINUTES FOR THE AIRBAG SYSTEM CAPACITOR
TO DISCHARGE BEFORE PERFORMING FURTHER
DIAGNOSIS OR SERVICE. THIS IS THE ONLY SURE
WAY TO DISABLE THE AIRBAG SYSTEM. FAILURE
TO TAKE THE PROPER PRECAUTIONS COULD
RESULT IN ACCIDENTAL AIRBAG DEPLOYMENT
AND POSSIBLE PERSONAL INJURY.

(1) Align the combination flasher terminals with

the terminals in the connector on the back of the left
multi-function switch housing. (Fig. 7).

(2) Push on the combination flasher until the ter-

minals are fully seated in the left multi-function
switch connector.

(3) Position the upper shroud onto the steering col-

umn (Fig. 27).

(4) Install and tighten the screws that secure the

lower steering column shroud to the upper shroud.
Tighten the screws to 2 N·m (18 in. lbs.).

(5) Move the tilt steering column to the fully

raised position and secure it in place by moving the
tilt release lever back to the locked position.

(6) Reinstall the steering column opening cover.

(Refer to 23 - BODY/INSTRUMENT PANEL/STEER-
ING COLUMN OPENING COVER - INSTALLA-
TION).

(7) Reconnect the battery negative cable.

DAYTIME RUNNING LAMP
MODULE

DESCRIPTION

The Daytime Running Lights (Headlamps) System

is installed on vehicles manufactured for sale in Can-
ada only. A separate module, mounted on the cowl,
controls the DRL.

Fig. 6 Steering Column Shrouds Remove/Install

1 - LEFT MULTI-FUNCTION SWITCH
2 - UPPER SHROUD
3 - RIGHT MULTI-FUNCTION SWITCH
4 - CLOCKSPRING
5 - IGNITION LOCK CYLINDER HOUSING
6 - LOWER SHROUD
7 - SCREW (2)

Fig. 7 Combination Flasher

1 - COMBINATION FLASHER
2 - LEFT MULTI-FUNCTION SWITCH

8L - 10

LAMPS/LIGHTING - EXTERIOR

COMBINATION FLASHER (Continued)

OPERATION

Battery positive voltage is supplied to the Daytime

Running Lamp (DRL) module through a circuit
breaker and a fuse in the PDC. Ignition positive volt-
age is supplied to the DRL module through a fuse in
the fuse block. The DRL module also utilizes a Vehi-
cle Speed Sensor (VSS) input, high and low beam
sense circuits and high beam indicator driver. The
DRL module is grounded to the chassis. Once the
vehicle reaches a speed of 3 kph (2 mph) and travels
more than 1 meter (3 feet) with the headlamp switch
in the off position, the DRL module will activate the
HIGH beams at a reduced intensity (36% of full
intensity). When the headlamp switch is placed in
the LOW beam position the DRL will turn off. When
the headlamp switch is turned to the HIGH beam
position, the high beams will operate normally (full
intensity) and the DRL module will also illuminate
the HIGH BEAM indicator in the instrument cluster.

DIAGNOSIS AND TESTING - DAYTIME
RUNNING LAMP SYSTEM

Always begin any diagnosis by testing all of the

fuses and circuit breakers in the system. Refer to the
appropriate wiring information.

CONDITION

POSSIBLE CAUSES

CORRECTION

DAYTIME RUNNING LAMPS (DRL)
DO NOT OPERATE

1. Headlamp switch in the on
position.

1. Turn the headlamp switch to the
off position.

2. Poor connection at DRL module.

2. Secure connector on DRL
module.

3. Open battery positive voltage
circuit to DRL module

3. Test and repair open circuit.

4. Open ignition positive circuit to
DLR module.

4. Test and repair open circuit.

5. Headlamp circuit shorted to
ground.

5. Test and repair headlamp circuit.

6. Open or high resistance in DLR
module ground circuit.

6. Test and repair ground circuit.

7. Open VSS signal circuit.

7. Test and repair VSS signal circuit.

8. Defective DRL module.

8. Replace DRL module.

REMOVAL

(1) Disconnect and isolate the battery negative

cable.

(2) Disconnect the wire harness connector from the

module.

(3) Remove the screws that attach the module to

the cowl (Fig. 8).

(4) Separate the module from the vehicle.

INSTALLATION

(1) Position the DRL module on the cowl.
(2) Install the screws.
(3) Connect the wire harness connector to the mod-

ule.

(4) Connect the battery negative cable.

LAMPS/LIGHTING - EXTERIOR

8L - 11

DAYTIME RUNNING LAMP MODULE (Continued)

FOG LAMP UNIT

DIAGNOSIS AND TESTING - FRONT FOG LAMP
SYSTEM

Always begin any diagnosis by testing all of the

fuses and circuit breakers in the system. Refer to the
appropriate wiring information.

CONDITION

POSSIBLE CAUSES

CORRECTION

FOG LAMPS ARE DIM
WITH ENGINE IDLING OR
IGNITION TURNED OFF.

1. Loose or corroded battery cables.

1. Clean and secure battery cable clamps
and posts.

2. Loose or worn generator drive
belt.

2. Adjust or replace generator drive belt.

3. Charging system output too low.

3. Test and repair charging system. (Refer
to 8 - ELECTRICAL/CHARGING -
DIAGNOSIS AND TESTING)

4. Battery has insufficient charge.

4. Test battery state-of -charge. (Refer to 8
- ELECTRICAL/BATTERY SYSTEM/
BATTERY - DIAGNOSIS AND TESTING)

5. Battery is sulfated or shorted.

5. Load test battery. (Refer to 8 -
ELECTRICAL/BATTERY SYSTEM/
BATTERY - DIAGNOSIS AND TESTING)

6. Poor lighting circuit ground.

6. Test for voltage drop across ground
locations.

FOG LAMP BULBS BURN
OUT FREQUENTLY

1. Charging system output too high.

1. Test and repair charging system. (Refer
to 8 - ELECTRICAL/CHARGING -
DIAGNOSIS AND TESTING)

2. Loose or corroded terminals or
splices in circuit.

2. Inspect and repair all connectors and
splices.

Fig. 8 DRL Module

1 - COWL
2 - DAYTIME RUNNING LAMP MODULE

8L - 12

LAMPS/LIGHTING - EXTERIOR

DAYTIME RUNNING LAMP MODULE (Continued)

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