2002 DODGE RAM light

8W-51 REAR LIGHTING
Component Page
Aftermarket Center High Mounted Stop
Lamp........................... 8W-51-4
Aftermarket Trailer Tow Connector...... 8W-51-2
Automatic Day/Night Mirror............ 8W-51-2
Back-Up Lamp Switch................ 8W-51-2
Brake Lamp Switch.................. 8W-51-3
Center High Mounted Stop Lamp No. 1 . . . 8W-51-4
Center High Mounted Stop Lamp No. 2 . . . 8W-51-4
Electric Brake Provision............... 8W-51-4
Fuse 5 (PDC)....................... 8W-51-3
Fuse 7 (JB)......................... 8W-51-2
Fuse F (PDC)....................... 8W-51-4
G100.......................... 8W-51-2, 5, 6
G200.............................. 8W-51-3
Headlamp Switch.................... 8W-51-4
Joint Connector No. 1............... 8W-51-2, 3
Joint Connector No. 6............... 8W-51-3, 4
Junction Block...................... 8W-51-2Component Page
Left Back-Up Lamp.................. 8W-51-2
Left Front Fender Lamp............... 8W-51-6
Left License Lamp................. 8W-51-5, 6
Left Rear Fender Lamp............... 8W-51-6
Left Tail/Stop/Turn Signal Lamp......... 8W-51-5
Park/Neutral Position Switch........... 8W-51-2
Power Distribution Center........... 8W-51-3, 4
Powertrain Control Module............. 8W-51-3
Right Back-Up Lamp................. 8W-51-2
Right Front Fender Lamp.............. 8W-51-6
Right License Lamp.................. 8W-51-5
Right Rear Fender Lamp.............. 8W-51-6
Right Tail/Stop/Turn Signal Lamp....... 8W-51-5
Speed Control Servo.................. 8W-51-3
Tailgate Lamp....................... 8W-51-6
Trailer Tow Connector................. 8W-51-2
Turn Signal/Hazard Switch............. 8W-51-5
BR/BE8W-51 REAR LIGHTING 8W - 51 - 1

8W-80 CONNECTOR PIN-OUTS
Component Page
4WD Switch........................ 8W-80-4
A/C Compressor Clutch................ 8W-80-4
A/C Heater Control................... 8W-80-4
A/C Heater Temperature Select......... 8W-80-4
A/C High Pressure Switch............. 8W-80-4
A/C Low Pressure Switch.............. 8W-80-5
Accelerator Pedal Position Sensor
(Diesel).......................... 8W-80-5
Aftermarket Trailer Tow Connector...... 8W-80-5
Airbag Control Module................ 8W-80-5
Ambient Temperature Sensor........... 8W-80-6
Ash Receiver Lamp................... 8W-80-6
Automatic Day/Night Mirror............ 8W-80-6
Back-Up Lamp Switch (M/T)........... 8W-80-6
Battery Temperature Sensor............ 8W-80-7
Blend Door Actuator.................. 8W-80-7
Blower Motor....................... 8W-80-7
Blower Motor Resistor Block............ 8W-80-7
Brake Lamp Switch.................. 8W-80-7
Brake Pressure Switch................ 8W-80-8
Bypass Jumper (A/T)................. 8W-80-8
C105.............................. 8W-80-8
C105.............................. 8W-80-8
C106.............................. 8W-80-8
C106.............................. 8W-80-8
C114 .............................. 8W-80-9
C114 .............................. 8W-80-9
C125 (Diesel)....................... 8W-80-9
C125 (Diesel)....................... 8W-80-9
C126 (Diesel)....................... 8W-80-10
C126 (Diesel)....................... 8W-80-10
C129............................. 8W-80-10
C129............................. 8W-80-11
C130 (Diesel)....................... 8W-80-11
C130 (Diesel) (In PDC)............... 8W-80-12
C130 (Gas)........................ 8W-80-13
C130 (Gas) (In PDC)................. 8W-80-14
C134............................. 8W-80-15
C134............................. 8W-80-17
C203............................. 8W-80-18
C203............................. 8W-80-19
C205............................. 8W-80-20
C205............................. 8W-80-20
C206 (Heated Seats)................. 8W-80-20
C206 (Heated Seats)................. 8W-80-21
C237............................. 8W-80-21
C237............................. 8W-80-21
C303............................. 8W-80-22
C303............................. 8W-80-22
C308............................. 8W-80-22
C308............................. 8W-80-22
C329 (Club Cab).................... 8W-80-22Component Page
C329 (Club Cab).................... 8W-80-23
C329 (Standard Cab)................ 8W-80-23
C329 (Standard Cab)................ 8W-80-23
C333 (Club Cab).................... 8W-80-23
C333 (Club Cab).................... 8W-80-23
C333 (Standard Cab)................ 8W-80-24
C333 (Standard Cab)................ 8W-80-24
C342............................. 8W-80-24
C342............................. 8W-80-24
C343............................. 8W-80-24
C343............................. 8W-80-24
C344 (Dual Rear Wheels)............. 8W-80-25
C344 (Dual Rear Wheels)............. 8W-80-25
C345............................. 8W-80-25
C345............................. 8W-80-25
C346............................. 8W-80-26
C346............................. 8W-80-26
C347............................. 8W-80-26
C347............................. 8W-80-27
C348............................. 8W-80-27
C348............................. 8W-80-28
C352............................. 8W-80-28
C352............................. 8W-80-28
C353............................. 8W-80-28
C353............................. 8W-80-28
C358............................. 8W-80-29
C358............................. 8W-80-29
C359 (Heated Seat).................. 8W-80-29
C359 (Heated Seat).................. 8W-80-29
C360 (Club Cab).................... 8W-80-30
C360 (Club Cab).................... 8W-80-30
C361............................. 8W-80-30
C361............................. 8W-80-30
C364............................. 8W-80-31
C364............................. 8W-80-31
C365 (Heated Seat).................. 8W-80-31
C365 (Heated Seat).................. 8W-80-31
Camshaft Position Sensor (8.0L Gas).... 8W-80-32
Camshaft Position Sensor (Diesel)...... 8W-80-32
Camshaft Position Sensor
(Gas Except 8.0L)................. 8W-80-32
Cargo Lamp No. 1................... 8W-80-32
Cargo Lamp No. 2................... 8W-80-32
Center High Mounted Stop Lamp No. 1 . . 8W-80-33
Center High Mounted Stop Lamp No. 2 . . 8W-80-33
Center Identification Lamp............ 8W-80-33
Central Timer Module C1............. 8W-80-33
Central Timer Module C2............. 8W-80-34
Cigar Lighter...................... 8W-80-34
Clockspring C1..................... 8W-80-34
Clockspring C2..................... 8W-80-34
Clockspring C3..................... 8W-80-35
BR/BE8W-80 CONNECTOR PIN-OUTS 8W - 80 - 1

CENTRAL TIMER MODULE C2 - 18 WAY
CAV CIRCUIT FUNCTION
1 P33 22OR/BK DOOR LOCK DRIVER
2 M11 22PK/LB COURTESY LAMP SWITCH OUTPUT
3 Z3 18BK/OR GROUND
4 P30 22OR/DG PASSENGER DOOR LOCK SWITCH OUTPUT
5 F12 22DB/WT FUSED IGNITION SWITCH OUTPUT (RUN-START)
6 G50 22RD/DB SECURITY RELAY CONTROL
7 P132 16OR/BK HEATED SEAT RELAY CONTROL
8 G69 22BK VTSS INDICATOR DRIVER
9 P34 22PK/BK DOOR UNLOCK DRIVER
10 G73 22LG/OR CYLINDER LOCK SWITCH MUX
11 M22 22WT DOME LAMP SWITCH SENSE
12 - -
13 P31 22PK/DG PASSENGER DOOR UNLOCK SWITCH OUTPUT
14 X20 22RD/BK RADIO CONTROL MUX
15 - -
16 D1 20VT/BR CCD BUS (+)
17 D2 20WT/BK CCD BUS (-)
18 X3 20BK/RD HORN RELAY CONTROL
CIGAR LIGHTER - NATURAL 3 WAY
CAV CIRCUIT FUNCTION
1 F30 18RD/OR FUSED IGNITION SWITCH OUTPUT (RUN-ACC)
2- -
3 Z3 18BK/OR GROUND
CLOCKSPRING C1-5WAY
CAV CIRCUIT FUNCTION
1 V37 22RD/LG SPEED CONTROL SWITCH SIGNAL
2 Z9 20BK/VT (HIGHLINE (REMOTE
RADIO))GROUND
3 K4 22BK/LB SENSOR GROUND
4 X20 22RD/BK (EXCEPT BASE)) RADIO CONTROL MUX
5 X3 20BK/RD HORN RELAY CONTROL
CLOCKSPRING C2 - YELLOW 2 WAY
CAV CIRCUIT FUNCTION
1 R43 18BK/LB DRIVER AIRBAG LINE 2
2 R45 18DG/LB DRIVER AIRBAG LINE 1
8W - 80 - 34 8W-80 CONNECTOR PIN-OUTSBR/BE

CONNECTOR NAME/
NUMBERCOLOR LOCATION FIG.
C126 (Diesel) GY Left Rear of Engine Compartment 3
C129 BK Above Left Front Body Cushion 20, 29
C130 At Power Distribution Center 1, 3
C134 BK Left Cowl 30, 33, 35
C203 Left Cowl 30, 33
C205 Instrument Panel Center Support N/S
C206 Left Cowl 25, 30, 33
C237 Bottom Right of Instrument Panel 30, 34
C303 BK Below Driver's Seat 23
C308 Center Rear of Headliner N/S
C329 BK Below Right Tail Lamp 27
C333 BK Below Left Tail Lamp 27
C342 BK Left Rear of Frame 27
C343 BK Left Rear of Frame 27
C344 (Dual Rear Wheels) BK Left Rear of Frame N/S
C345 Right Door N/S
C346 Right Door N/S
C347 Left Door 25
C348 Left Door 25
C352 WT Left A-Pillar 25
C353 WT Right A-Pillar 25
C358 NAT Left Side Instrument Panel 25, 30, 33, 35
C359 Heated Seat To Body Wiring 23
C360 Below Driver's Seat 23
C361 Left Rear Speaker Wiring N/S
C364 Right Rear Speaker Wiring N/S
C365 Under Passenger Power Seat N/S
Camshaft Position Sensor
(V8)GY Near of Distributor 5
Camshaft Position Sensor
(V10)GY Front of Engine 8
Camshaft Position Sensor
(Diesel)Left Front of Engine 13
Cargo Lamp No. 1 BK Rear of Lamp N/S
Cargo Lamp No. 2 BK Rear of Lamp N/S
Center High Mounted Stop
Lamp No. 1BK Rear of Cab 23
Center High Mounted Stop
Lamp No. 2BK Rear of Cab 23
Center Identification Lamp BK Behind Front of Headliner 25
Central Timer Module C1 Left Side Under Instrument Panel 30, 32
Central Timer Module C2 Left Side Under Instrument Panel 30, 32
Cigar Lighter NAT Center of Instrument Panel 33
8W - 91 - 2 8W-91 CONNECTOR/GROUND/SPLICE LOCATIONBR/BE
CONNECTOR/GROUND/SPLICE LOCATION (Continued)

8W-97 POWER DISTRIBUTION
TABLE OF CONTENTS
page page
POWER DISTRIBUTION
DESCRIPTION..........................1
OPERATION............................1
SPECIAL TOOLS
POWER DISTRIBUTION SYSTEMS.........2
CIGAR LIGHTER OUTLET
DESCRIPTION..........................2
OPERATION............................2
DIAGNOSIS AND TESTING - CIGAR LIGHTER
OUTLET.............................2
REMOVAL.............................3
INSTALLATION..........................4
CIRCUIT BREAKER
DESCRIPTION..........................4
DIAGNOSIS AND TESTING - CIRCUIT
BREAKER............................4
GENERATOR CARTRIDGE FUSE
DESCRIPTION..........................4
OPERATION............................4
REMOVAL.............................4
INSTALLATION..........................4
IOD FUSE
DESCRIPTION..........................5
OPERATION............................5
REMOVAL.............................6
INSTALLATION..........................6
JUNCTION BLOCK
DESCRIPTION..........................6
OPERATION............................7
DIAGNOSIS AND TESTING - JUNCTION
BLOCK..............................7
REMOVAL.............................7
INSTALLATION..........................8POWER DISTRIBUTION CENTER
DESCRIPTION..........................8
OPERATION............................8
REMOVAL.............................8
INSTALLATION.........................10
POWER OUTLET
DESCRIPTION.........................10
OPERATION...........................10
DIAGNOSIS AND TESTING - POWER OUTLET . 10
REMOVAL.............................11
INSTALLATION.........................11
HORN RELAY
DESCRIPTION.........................12
DIAGNOSIS AND TESTING - HORN RELAY . . . 12
REMOVAL.............................12
INSTALLATION.........................12
HEADLAMP RELAY
DESCRIPTION.........................13
REMOVAL.............................13
INSTALLATION.........................13
MICRO-RELAY
DESCRIPTION.........................13
OPERATION...........................14
DIAGNOSIS AND TESTING - MICRO-RELAY . . 14
REMOVAL.............................14
INSTALLATION.........................14
RELAY
DESCRIPTION.........................14
OPERATION...........................14
DIAGNOSIS AND TESTING - RELAY.........15
REMOVAL.............................15
INSTALLATION.........................15
POWER DISTRIBUTION
DESCRIPTION
This group covers the various standard and
optional power distribution components used on this
model. The power distribution system for this vehicle
consists of the following components:
²Power Distribution Center (PDC)
²Junction Block (JB).
The power distribution system also incorporates
various types of circuit control and protection fea-
tures, including:
²Automatic resetting circuit breakers
²Blade-type fuses²Cartridge fuses
²Circuit splice blocks
²Flashers
²Relays.
Following are general descriptions of the major
components in the power distribution system. See the
owner's manual in the vehicle glove box for more
information on the features and use of all of the
power distribution system components. Refer toWir-
ing Diagramsfor complete circuit diagrams for the
various power distribution system components.
OPERATION
The power distribution system for this vehicle is
designed to provide safe, reliable, and centralized dis-
BR/BE8W-97 POWER DISTRIBUTION 8W - 97 - 1

tribution points for the electrical current required to
operate all of the many standard and optional facto-
ry-installed electrical and electronic powertrain,
chassis, safety, security, comfort and convenience sys-
tems. At the same time, the power distribution sys-
tem was designed to provide ready access to these
electrical distribution points for the vehicle techni-
cian to use when conducting diagnosis and repair of
faulty circuits. The power distribution system can
also prove useful for the sourcing of additional elec-
trical circuits that may be required to provide the
electrical current needed to operate many accessories
that the vehicle owner may choose to have installed
in the aftermarket.
SPECIAL TOOLS
POWER DISTRIBUTION SYSTEMS
CIGAR LIGHTER OUTLET
DESCRIPTION
A cigar lighter is standard equipment on this
model. The cigar lighter is installed in the instru-
ment panel next to the ash receiver, which is located
near the center of the instrument panel, below the
radio. The cigar lighter base is secured by a snap fit
within the instrument panel.
The cigar lighter knob and heating element unit,
and the cigar lighter receptacle unit are available for
service. These components cannot be repaired and, if
faulty or damaged, they must be replaced.
OPERATION
The cigar lighter consists of two major components:
a knob and heating element unit, and the cigar
lighter base or receptacle shell. The receptacle shell
is connected to ground, and an insulated contact in
the bottom of the shell is connected to battery cur-
rent. The cigar lighter receives battery voltage from afuse in the junction block only when the ignition
switch is in the Accessory or On positions.
The knob and heating element are encased within
a spring-loaded housing, which also features a sliding
protective heat shield. When the knob and heating
element are inserted in the receptacle shell, the heat-
ing element resistor coil is grounded through its
housing to the receptacle shell. If the cigar lighter
knob is pushed inward, the heat shield slides up
toward the knob exposing the heating element, and
the heating element extends from the housing toward
the insulated contact in the bottom of the receptacle
shell.
Two small spring-clip retainers are located on
either side of the insulated contact inside the bottom
of the receptacle shell. These clips engage and hold
the heating element against the insulated contact
long enough for the resistor coil to heat up. When the
heating element is engaged with the contact, battery
current can flow through the resistor coil to ground,
causing the resistor coil to heat.
When the resistor coil becomes sufficiently heated,
excess heat radiates from the heating element caus-
ing the spring-clips to expand. Once the spring-clips
expand far enough to release the heating element,
the spring-loaded housing forces the knob and heat-
ing element to pop back outward to their relaxed
position. When the cigar lighter knob and element
are pulled out of the receptacle shell, the protective
heat shield slides downward on the housing so that
the heating element is recessed and shielded around
its circumference for safety.
DIAGNOSIS AND TESTING - CIGAR LIGHTER
OUTLET
For complete circuit diagrams, refer toCigar
Lighterin Wiring Diagrams.
WARNING: REFER TO THE PASSIVE RESTRAINT
SECTION OF THE SERVICE MANUAL BEFORE
ATTEMPTING ANY STEERING WHEEL, STEERING
COLUMN, OR INSTRUMENT PANEL COMPONENT
DIAGNOSIS OR SERVICE. FAILURE TO TAKE THE
PROPER PRECAUTIONS COULD RESULT IN ACCI-
DENTAL AIRBAG DEPLOYMENT AND POSSIBLE
PERSONAL INJURY.
(1) Check the fused ignition switch output (run/ac-
cessory) fuse in the junction block. If OK, go to Step
2. If not OK, repair the shorted circuit or component
as required and replace the faulty fuse.
(2) Turn the ignition switch to the On position.
Check for battery voltage at the fused ignition switch
output (run/accessory) fuse in the junction block. If
OK, go to Step 3. If not OK, repair the open fused
Terminal Pick Kit 6680
8W - 97 - 2 8W-97 POWER DISTRIBUTIONBR/BE
POWER DISTRIBUTION (Continued)

ignition switch output (run/accessory) circuit to the
ignition switch as required.
(3) Turn the ignition switch to the Off position.
Remove the cigar lighter knob and element from the
cigar lighter receptacle. Check for continuity between
the inside circumference of the cigar lighter recepta-
cle and a good ground. There should be continuity. If
OK, go to Step 4. If not OK, go to Step 5.
(4) Turn the ignition switch to the On position.
Check for battery voltage at the insulated contact
located at the back of the cigar lighter receptacle. If
OK, replace the faulty cigar lighter knob and ele-
ment. If not OK, go to Step 5.
(5) Turn the ignition switch to the Off position.
Disconnect and isolate the battery negative cable.
Remove the cigar lighter receptacle from the instru-
ment panel and disconnect the wire harness connec-
tor. Check for continuity between the ground circuit
cavity of the cigar lighter wire harness connector and
a good ground. There should be continuity. If OK, go
to Step 6. If not OK, repair the open ground circuit to
ground as required.
(6) Connect the battery negative cable. Turn the
ignition switch to the On position. Check for battery
voltage at the fused ignition switch output (run/ac-
cessory) circuit cavity of the cigar lighter wire har-
ness connector. If OK, replace the faulty cigar lighter
receptacle. If not OK, repair the open fused ignition
switch output (run/accessory) circuit to the junction
block fuse as required.
REMOVAL
(1) Disconnect and isolate the battery negative
cable.
(2) Pull the cigar lighter knob and element out of
the cigar lighter receptacle base, or unsnap the pro-
tective cap from the power outlet receptacle base
(Fig. 1).
(3) Look inside the cigar lighter or power outlet
receptacle base and note the position of the rectangu-
lar retaining bosses of the mount that secures the
receptacle base to the instrument panel (Fig. 2).
(4) Insert a pair of external snap ring pliers into
the cigar lighter or power outlet receptacle base and
engage the tips of the pliers with the retaining
bosses of the mount.
(5) Squeeze the pliers to disengage the mount
retaining bosses from the receptacle base and, using
a gentle rocking motion, pull the pliers and the
receptacle base out of the mount.
(6) Pull the receptacle base away from the instru-
ment panel far enough to access the instrument
panel wire harness connector.
(7) Disconnect the instrument panel wire harness
connector from the cigar lighter or power outlet
receptacle base connector receptacle.
Fig. 1 Cigar Lighter and Power Outlet - Typical
1 - RECEPTACLE BASE
2 - KNOB & ELEMENT
3 - MOUNT
4 - WIRE HARNESS CONNECTOR
5 - POWER OUTLET
Fig. 2 Cigar Lighter and Power Outlet Remove/
Install
1 - KNOB AND ELEMENT
2 - RETAINING BOSSES-ENGAGE PLIERS HERE
3 - BASE
4 - PARTIALLY REMOVED
5 - EXTERNAL SNAP-RING PLIERS
6 - MOUNT
7 - BASE
BR/BE8W-97 POWER DISTRIBUTION 8W - 97 - 3
CIGAR LIGHTER OUTLET (Continued)

(8) Remove the cigar lighter or power outlet mount
from the instrument panel.
INSTALLATION
(1) Reconnect the instrument panel wire harness
connector to the cigar lighter or power outlet recep-
tacle base connector receptacle.
(2) Install the cigar lighter or power outlet mount
into the instrument panel.
(3) Align the splines on the outside of the cigar
lighter or power outlet receptacle base connector
receptacle with the grooves on the inside of the
mount.
(4) Press firmly on the cigar lighter or power out-
let receptacle base until the retaining bosses of the
mount are fully engaged in their receptacles.
(5) Install the cigar lighter knob and element into
the cigar lighter receptacle base, or the protective cap
into the power outlet receptacle base.
(6) Reconnect the battery negative cable.
CIRCUIT BREAKER
DESCRIPTION
Automatic resetting circuit breakers are used to
protect a system circuit from a short circuit or over-
load. Some examples of his condition can be caused
by an obstructed or stuck seat adjuster or power win-
dow motor.
The circuit breaker cannot be repaired and, if
faulty or damaged, it must be replaced.
DIAGNOSIS AND TESTING - CIRCUIT BREAKER
For circuit descriptions and diagrams, refer to Wir-
ing Diagrams.
(1) Locate the correct circuit breaker in the junc-
tion block. Pull out the circuit breaker slightly, but
be certain that the circuit breaker terminals still con-
tact the terminals in the junction block cavities.
(2) Connect the negative lead of a 12-volt DC volt-
meter to a good ground.
(3) With the voltmeter positive lead, check both
terminals of the circuit breaker for battery voltage.
If only one terminal has battery voltage, the circuit
breaker is faulty and must be replaced. If neither ter-
minal has battery voltage, repair the open circuit
from the Power Distribution Center (PDC) as
required.
GENERATOR CARTRIDGE
FUSE
DESCRIPTION
A 140 ampere generator cartridge fuse is used on
this model. The generator cartridge fuse is similar to
other cartridge fuses found in the Power Distribution
Center (PDC). This fuse has a color-coded plastic
housing and a clear plastic fuse conductor inspection
cover like other cartridge fuses, but has a higher cur-
rent rating and is connected and secured with screws
instead of being pushed onto male spade-type termi-
nals. The generator cartridge fuse cannot be repaired
and, if faulty or damaged, it must be replaced.
OPERATION
The generator cartridge fuse is secured between
the two B(+) terminal stud connection bus bars
within the Power Distribution Center (PDC). This
fuse protects the vehicle electrical system from dam-
age that could be caused by excessive charging sys-
tem output and/or excessive electrical system current
levels resulting from a faulty generator or faulty
charging system control circuits. If the current rating
of the fuse is exceeded, the fuse conductor melts to
open the generator output circuit connection to the
PDC. If a generator cartridge fuse fails, be certain to
completely inspect and test the vehicle charging sys-
tem before replacing the fuse and returning the vehi-
cle to service. Refer toCharging Systemfor the
charging system diagnostic procedures. Refer toWir-
ing Diagramsfor the location of complete PDC cir-
cuit diagrams.
REMOVAL
If a generator cartridge fuse fails, be certain to
inspect and test the vehicle charging system before
replacing the cartridge fuse and returning the vehicle
to service. Refer toCharging Systemin the index of
this service manual for the charging system diagnos-
tic procedures.
(1) Disconnect and isolate the battery negative
cable.
(2) Unlatch and remove the cover from the Power
Distribution Center (PDC).
(3) Remove the two screws that secure the genera-
tor cartridge fuse to the two B(+) terminal stud bus
bars within the PDC.
(4) Remove the generator cartridge fuse from the
PDC.
INSTALLATION
If a generator cartridge fuse fails, be certain to
inspect and test the vehicle charging system before
replacing the cartridge fuse and returning the vehicle
8W - 97 - 4 8W-97 POWER DISTRIBUTIONBR/BE
CIGAR LIGHTER OUTLET (Continued)