circuits require an overload protected power and high
side drivers source, ON/OFF device, lamps and body
grounds to operate properly. Plastic lamps require a
wire in the harness to supply body ground to the
lamp socket. Replace sockets and bulbs that are cor-
roded.

Some of the interior and exterior lighting functions

are governed by the Body Control Module (BCM).
The headlamp, dome, and the door ajar switches pro-
vide signals to the BCM. The BCM in turn sends a
Programmable Communication Interface (PCI) bus
message to the Front Control Module (FCM) to
enable the necessary drivers to set the required illu-
mination configuration.

Wire connectors can make intermittent contact or

become corroded. Before coupling wire connectors,
inspect the terminals inside the connector. Male ter-
minals should not be bent or disengaged from the
insulator. Female terminals should not be sprung
open or disengaged from the insulator. Bent and
sprung terminals can be repaired using needle nose
pliers and pick tool. Corroded terminals appear
chalky or green. Corroded terminals should be
replaced to avoid recurrence of the problem symp-
toms.

Begin electrical system failure diagnosis by testing

related fuses in the fuse block and intelligent power
module. Verify that bulbs are in good condition and
test continuity of the circuit ground. Refer to the
appropriate wiring information.

AUTOMATIC HEADLAMP SYSTEM

The Automatic Headlamp system turns the instru-

mentation and exterior illumination lamps ON when
the ambient light levels are Night and the engine
RPM is 450 or above, and OFF when light levels are
Day.

DAYTIME RUNNING LAMPS

Operating the high-beam headlamps at reduced

power provides daytime running lamps, which are
required on all new Canadian vehicles. Daytime run-
ning lamps are functional when 450 rpm’s are
reached.

HEADLAMPS ON WITH WINDSHIELD WIPERS

For vehicles equipped with the Automatic Head-

lamp System, the instrumentation and exterior illu-
mination

lamps

will

turned

when

the

headlamp switch is in the AUTO position, RPM >

450 and the windshield wipers have been in the
intermittent, low or high mode of operation for more
than ten seconds. When the windshield wipers are
turned OFF the Body Control Module will determine
if the instrumentation and exterior illumination
lamps should remain ON base upon the current
ambient light level.

HEADLAMP SYSTEM

The configuration of the headlamp system of head-

lamps, park lamps and fog lamps is determined by
the BCM. The BCM determines the lighting configu-
ration as a result of the inputs from the ignition
switch, headlamp switch and multi-function switch. A
PCI bus is transmitted from the BCM to the FCM to
enable the necessary drivers to set the illumination
configuration. Four wires are connected between the
headlamp switch and the BCM. The first wire con-
tains information regarding the position of the head-
lamp switch (Off, Automatic Headlamps, Automatic
Headlamp switch fog, Park with Fog, Head, or Head
with Fog Lamps). The second wire contains informa-
tion regarding the position of the dimmer switch
(Dome Lamp, Daytime Brightness, Dimming Level or
Off). The third wire is a dedicated signal return
(ground) wire. The fourth wire provides power to the
front fog lamp indicator.

HEADLAMP TIME DELAY SYSTEM

The headlamp time delay system is controlled by

the Body Control Module (BCM) via a PCI bus mes-
sage transmitted by the BCM to the FCM to turn off
the headlamps.

OPERATION

AUTOMATIC HEADLAMP SYSTEM

Automatic headlamps are controlled by the Body

Control Module (BCM). With the headlamp switch in
the AUTO position, the BCM will control the head-
lamp, parking, side marker, tail and instrumentation
lamps based on ambient light levels. Ambient light
levels are monitored by the BCM using the Day/
Night signal and Electrochromatic Mirror (ECM)
present from the Compass Mini Trip (CMTC) located
on the front windshield in front of the rear view mir-
ror ECM. Ambient light readings are averaged to
limit cycling the lamps ON and OFF when passing
through areas with varying light levels. The auto-
matic headlamps will only function when the engine
is running with RPM > 450. When the headlamp
switch is in the AUTO position (Automatic mode), the
Headlamp Time Delay system will function when the
ignition switch is placed in any position other than
run/start.

8L - 2

LAMPS/LIGHTING - EXTERIOR

DAYTIME RUNNING LAMPS

Power is reduced using pulse-width modulation to

the high beams, where by the power is switched on
and off rapidly instead of remaining on continuously.
The duration and interval of the power pulses is pro-
grammed into the FCM. Daytime running lamps are
functional when 450 rpm’s are reached.

HEADLAMP SYSTEM

The headlamp system will default to headlamps

ON position when ignition switch is ON and when an
open or short circuit failure occurs on the headlamp
switch input or PCI data bus communication between
the BCM and the FCM fails. The system will return
to normal operation when the open or short is
repaired. A fault will be reported by the BCM when a
failure occurs on the dimmer or headlamp switch
input.

If the exterior lamps are ON and the headlamp

switch is in any position other than OFF or AUTO
and with the ignition switch OFF (LOCK) after 3
minutes the BCM sends a message via PCI bus to
the FCM informing the FCM to turn off the head-
lamps, park lamps and fog lamps. This feature pre-
vents the vehicle battery from being discharged when
the vehicle lights have been left ON.

HEADLAMP TIME DELAY SYSTEM

The headlamp time delay system is activated by

turning the headlamps ON (high or low beam) while
the engine is running, turning the ignition switch
OFF, and then turning the headlamp switch OFF
within 45 seconds. The system will not activate if
more than 45 seconds elapse between ignition switch
OFF and headlamp switch OFF. The BCM will allow
the headlamps to remain ON for 90 seconds (config-
urable) before they automatically turn off (If the key
is in the ignition during the headlamp time delay
mode, then both the headlamps and park lamps
(including panel dimming) will be ON). Refer to the
Owner’s Manual for more information.

If the headlamp switch is in the Auto Headlamp

Position, the headlamps are ON due to the night sig-
nal from the CMTC and the ignition switch is in any
position other than run/start, the BCM shall enter a
90 second (configurable) Auto Headlamps time delay
mode. If the key is in the ignition during the head-
lamp time delay mode, then both the headlamps and
park lamps (including panel dimming) will be ON. If
the key is not in the ignition, then only the head-
lamps will be ON. The BCM will allow the head-
lamps to remain ON for 90 seconds before they
automatically turn OFF. Refer to the Owner’s Man-
ual for more information.

OPTICAL HORN/HIGH BEAMS

When the multi-function switch is pulled to the

first detent (optical horn) signal, the headlamps are
ON, key-in the ignition the BCM shall send a mes-
sage via PCI bus to the FCM to turn on the head-
lamps drivers to illuminate all four filaments (Low
and High beams). When the multi-function switch is
pulled to the second detent (high beam) signal and
the headlamps are ON, the BCM shall send a mes-
sage via PCI bus to the FCM to turn on the head-
lamps drivers. The High Beams are illuminated and
the Low Beams and Fog Lamps (if ON) are extin-
guished. If the headlamps were in the high beam
configuration when power was removed from the
headlamps, the headlamps will be configured as low
beam the next time they are activated.

NOTE: For RG - Export vehicles, the low beams and
front fog lamps will remain ON when high beams
are activated.

WARNING

Eye protection should be used when servicing

glass components. Personal injury or death can
result.

Do not touch the glass of halogen bulbs with

fingers or other possibly oily surface, reduced
bulb life will result. Do not use bulbs other
than those indicated in the Bulb Application
table. Damage to lamp and/or Daytime Running
Lamp Module can result. Do not use fuses, cir-
cuit breakers or relays having greater amper-
age value than indicated on the fuse panel or in
the Owners Manual.

Do not use bulbs other than those listed in

the Bulb Application Table. Damage to lamp
can result. Do not touch halogen bulbs with fin-
gers or other oily surfaces. Bulb life will be
reduced.

SPECIFICATIONS

EXTERIOR LAMPS

BULB APPLICATION TABLE

LAMP

BULB

BACK-UP

3057

CHMSL

921

FRONT SIDE MARKER/PARK/
TURN (DODGE)

3157A

FRONT SIDE MARKER/PARK/
TURN (CHRYSLER)

3157AK

LAMPS/LIGHTING - EXTERIOR

8L - 3

LAMPS/LIGHTING - EXTERIOR (Continued)

LAMP

BULB

FRONT FOG

9145

HEADLAMP (DODGE)

9007

HEADLAMP (CHRYSLER

H13

LICENSE

168

TAIL, STOP, TURN SIGNAL

3057

BULB APPLICATION TABLE - EXPORT

LAMP

BULB

HEADLAMP LOW BEAM

HEADLAMP HIGH BEAM

FRONT FOG

FRONT POSITION

W5W

FRONT TURN SIGNAL

PY21W

SIDE REPEATER

T4W

LICENSE PLATE

W5W/168

REAR TAIL AND STOP

P21/5W

REAR TURN SIGNAL

PY21W

BACK-UP

P21W

REAR FOG

P21W

CHMSL

W16W/921

BRAKE LAMP SWITCH

DESCRIPTION

The brake lamp switch is located under the instru-

ment panel, at the brake pedal arm (Fig. 3). It has
three internal switches controlling various functions
of the vehicle. It’s main function is to control opera-
tion of the vehicle’s brake lamps via a brake switch
input to the BCM. The BCM will then activate the
stop lamps. Other functions include speed control
deactivation, brake sense for the antilock brake sys-
tem and brake sense for the brake transmission shift
interlock.

CAUTION: The switch can only be adjusted once.
That is during initial installation of the switch. If the
switch

not

adjusted

properly

has

been

removed for some service, a new switch must be
installed and adjusted.

OPERATION

When the brake pedal is pressed, the plunger on

the outside of the brake lamp switch extends out-
ward. This action opens or closes the contacts of the
three switches inside the brake lamp switch.

With the brake pedal pressed down (plunger

extended), the switch for terminals 1 and 2 is closed
completing the circuit. The switch for terminals 3
and 4 is open and so is the switch for terminals 5
and 6.

When the brake pedal is released (plunger pushed

in), the three switches assume the opposite positions.
The switch for terminals 1 and 2 is now open while
the other two switches are now closed, completing
their circuits.

A lever on the back of the switch is used to set the

switch into the “adjusted” position. A non-adjusted
switch will have the lever set to the diagonal position
in relation to the switch housing. The plunger can be
moved in and out, but the states of the internal
switches will not change.

CAUTION: Never move the adjustment lever of the
new brake lamp switch without it being properly
installed in the vehicle first. Such action will render
the switch unusable and the switch must be dis-
carded.

Once installed in the vehicle as described in the

brake lamp switch installation procedure (Refer to 8 -
ELECTRICAL/LAMPS/LIGHTING

EXTERIOR/

BRAKE LAMP SWITCH - INSTALLATION), the new
switch’s adjustment lever is rotated to the adjusted
position as indicated (Fig. 4). This action locks the
plunger to the internal switches. Once in this posi-
tion the switch is permanently adjusted (or
locked) and cannot be readjusted or released
even if the lever is moved back.

DIAGNOSIS AND TESTING - BRAKE LAMP
SWITCH

NOTE: Before proceeding with this diagnostic test,
verify the adjustment lever on the back of the
switch is in the adjusted position. If the lever is in
the non-adjusted (diagonal) position it may have
never been adjusted (Refer to 8 - ELECTRICAL/
LAMPS/LIGHTING

EXTERIOR/BRAKE

LAMP

SWITCH - OPERATION). For adjustment, (Refer to 8
-

ELECTRICAL/LAMPS/LIGHTING

EXTERIOR/

BRAKE LAMP SWITCH - INSTALLATION)

If the electrical circuit has been tested and the

brake lamp switch is suspected of being faulty, it can
be tested using the following method.

(1) Remove the switch from the vehicle. (Refer to 8

- ELECTRICAL/LAMPS/LIGHTING - EXTERIOR/
BRAKE LAMP SWITCH - REMOVAL)

(2) With

the

switch

the

released

position

(plunger extended), use an ohmmeter to test each of
the three internal switches as shown (Fig. 1). You
should achieve the results as listed in the figure.

8L - 4

LAMPS/LIGHTING - EXTERIOR

LAMPS/LIGHTING - EXTERIOR (Continued)

Content .. 721 722 723 724 ..