2001 DODGE RAM ECU

8W-39 VEHICLE THEFT SECURITY SYSTEM
Component Page
Central Timer Module C1.............. 8W-39-4
Central Timer Module C2.......... 8W-39-2, 3, 4
Clockspring......................... 8W-39-3
Daytime Running Lamp Module......... 8W-39-2
Driver Cylinder Lock Switch............ 8W-39-4
Driver Door Ajar Switch............... 8W-39-4
Fuse G (PDC)....................... 8W-39-2
Fuse H (PDC)....................... 8W-39-3
G100.............................. 8W-39-3
G102.............................. 8W-39-2
G300.............................. 8W-39-4
Headlamp Beam Select Switch.......... 8W-39-2
High Note Horn..................... 8W-39-3
Horn Relay......................... 8W-39-3Component Page
Horn Switch........................ 8W-39-3
Joint Connector No. 1............... 8W-39-2, 3
Joint Connector No. 3................. 8W-39-3
Joint Connector No. 6................. 8W-39-3
Joint Connector No. 8................. 8W-39-4
Left Outboard Headlamp.............. 8W-39-2
Low Note Horn...................... 8W-39-3
Overhead Console.................... 8W-39-4
Passenger Cylinder Lock Switch......... 8W-39-4
Passenger Door Ajar Switch............ 8W-39-4
Power Distribution Center........... 8W-39-2, 3
Right Outboard Headlamp............. 8W-39-2
Security Relay....................... 8W-39-2
BR/BE8W-39 VEHICLE THEFT SECURITY SYSTEM 8W - 39 - 1

8W-45 CENTRAL TIMER MODULE
Component Page
Central Timer Module C1......... 8W-45-8, 9, 10
Central Timer Module C2...... 8W-45-2, 3, 4, 6, 7
Clockspring......................... 8W-45-7
Data Link Connector................. 8W-45-2
Driver Cylinder Lock Switch............ 8W-45-6
Driver Door Ajar Switch............ 8W-45-10, 7
Driver Door Lock Motor............... 8W-45-6
Driver Door Window/Lock Switch........ 8W-45-5
Fuse 6 (JB)....................... 8W-45-8, 9
Fuse 11 (JB)...................... 8W-45-2, 8
Fuse 13 (JB)...................... 8W-45-5, 8
Fuse G (PDC)....................... 8W-45-3
Fuse H (PDC)....................... 8W-45-4
G100............................ 8W-45-4, 9
G102.............................. 8W-45-3
G200.............................. 8W-45-8
G201.............................. 8W-45-2
G300......................... 8W-45-10, 6, 7
Headlamp Switch............. 8W-45-10, 2, 7, 8
Heated Seat Relay................... 8W-45-7
High Note Horn..................... 8W-45-4
Horn Relay......................... 8W-45-4
Ignition Switch................. 8W-45-10, 7, 8Component Page
Instrument Cluster................... 8W-45-8
Intermittent Wiper Switch............. 8W-45-9
Joint Connector No. 1............... 8W-45-3, 4
Joint Connector No. 2................. 8W-45-9
Joint Connector No. 3................. 8W-45-4
Joint Connector No. 5................. 8W-45-2
Joint Connector No. 6........ 8W-45-4, 7, 8, 9, 10
Joint Connector No. 7................. 8W-45-2
Joint Connector No. 8............ 8W-45-7, 8, 10
Junction Block............... 8W-45-2, 5, 7, 8, 9
Left Outboard Headlamp.............. 8W-45-3
Low Note Horn...................... 8W-45-4
Overhead Console.................... 8W-45-6
Passenger Cylinder Lock Switch......... 8W-45-6
Passenger Door Ajar Switch........... 8W-45-10
Passenger Door Lock Motor............ 8W-45-6
Passenger Door Window/Lock Switch . . . 8W-45-5, 6
Power Distribution Center........... 8W-45-3, 4
Right Outboard Headlamp............. 8W-45-3
Security Relay....................... 8W-45-3
Wiper Motor........................ 8W-45-9
Wiper Motor Relay................... 8W-45-9
BR/BE8W-45 CENTRAL TIMER MODULE 8W - 45 - 1

8W-50 FRONT LIGHTING
Component Page
Cargo Lamp No. 1.................... 8W-50-2
Cargo Lamp No. 2.................... 8W-50-2
Center Identification Lamp............. 8W-50-8
Central Timer Module C2.............. 8W-50-2
Daytime Running Lamp Module.... 8W-50-6, 9, 11,
12, 13
Fog Lamp Indicator............... 8W-50-10, 11
Fog Lamp Relay............. 8W-50-6, 10, 11, 12
Fuse 5 (JB)......................... 8W-50-3
Fuse 7 (JB)........................ 8W-50-12
Fuse 14 (JB)...................... 8W-50-6, 9
Fuse B (PDC)....................... 8W-50-4
Fuse C (PDC)....................... 8W-50-4
Fuse E (PDC)....................... 8W-50-5
Fuse F (PDC).................. 8W-50-10, 11, 3
Fuse G (PDC)................ 8W-50-10, 11, 12
G100........................... 8W-50-7, 12
G102........................... 8W-50-5, 13
G201.................. 8W-50-2, 4, 6, 9, 10, 11
G302.............................. 8W-50-8
Headlamp Beam Select Switch....... 8W-50-4, 6,
9, 10, 13
Headlamp Switch........... 8W-50-2, 3, 4, 10, 11
Ignition Switch...................... 8W-50-3
Instrument Cluster............ 8W-50-2, 6, 9, 13
Joint Connector No. 1............ 8W-50-4, 5, 13Component Page
Joint Connector No. 3................. 8W-50-7
Joint Connector No. 4.............. 8W-50-12, 7
Joint Connector No. 5........... 8W-50-3, 10, 11
Joint Connector No. 6............... 8W-50-2, 3
Joint Connector No. 8............... 8W-50-2, 3
Junction Block.......... 8W-50-2, 3, 6, 7, 8, 9, 12
Left Fog Lamp................... 8W-50-10, 11
Left Headlamp...................... 8W-50-5
Left Outboard Clearance Lamp.......... 8W-50-8
Left Outboard Headlamp............ 8W-50-4, 6
Left Outboard Identification Lamp....... 8W-50-8
Left Park/Turn Signal Lamp............ 8W-50-7
Overhead Console.................... 8W-50-2
Park Brake Switch.................. 8W-50-12
Power Distribution Center...... 8W-50-10, 11, 12,
3, 4, 5
Quad High Beam Relay............. 8W-50-13, 5
Right Fog Lamp................. 8W-50-10, 11
Right Headlamp..................... 8W-50-5
Right Outboard Clearance Lamp........ 8W-50-8
Right Outboard Headlamp........... 8W-50-4, 6
Right Outboard Identification Lamp...... 8W-50-8
Right Park/Turn Signal Lamp........... 8W-50-7
Security Relay...................... 8W-50-13
Trailer Tow Relay.................... 8W-50-7
BR/BE8W-50 FRONT LIGHTING 8W - 50 - 1

CENTRAL TIMER MODULE C1 - GREEN 14 WAY
CAV CIRCUIT FUNCTION
1 G75 22TN DRIVER DOOR AJAR SWITCH SENSE
2 G13 22DB/RD CHIME REQUEST SIGNAL
3 V8 16VT WIPER SWITCH MODE SENSE
4 V18 22YL/DG WIPER MOTOR RELAY CONTROL
5 G16 22BK/LB PASSENGER DOOR AJAR SWITCH SENSE
6 Z2 22BK/LG GROUND
7- -
8 F12 22DB/WT (BASE/MIDLINE) FUSED IGNITION SWITCH OUTPUT (RUN-START)
8 V6 16DB (HIGHLINE/PREMIUM) FUSED IGNITION SWITCH OUTPUT (RUN-ACC)
9 G26 22LB KEY-IN IGNITION SWITCH SENSE
10 V10 16BR WASHER SWITCH SENSE
11 V5 16DG WIPER PARK SWITCH SENSE
12 V9 16WT/DB WIPER SWITCH MODE SIGNAL
13 - -
14 F35 22RD FUSED B(+)
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
8W - 80 - 32 8W-80 CONNECTOR PIN-OUTSBR/BE

8W-97 POWER DISTRIBUTION
TABLE OF CONTENTS
page page
POWER DISTRIBUTION
DESCRIPTION............................1
OPERATION.............................1
SPECIAL TOOLS..........................2
CIGAR LIGHTER OUTLET
DESCRIPTION............................2
OPERATION.............................2
DIAGNOSIS AND TESTING..................2
CIGAR LIGHTER........................2
REMOVAL...............................3
INSTALLATION............................3
CIRCUIT BREAKER
DESCRIPTION............................4
DIAGNOSIS AND TESTING..................4
CIRCUIT BREAKER......................4
GENERATOR CARTRIDGE FUSE
DESCRIPTION............................4
OPERATION.............................4
REMOVAL...............................4
INSTALLATION............................4
IOD FUSE
DESCRIPTION............................4OPERATION.............................5
REMOVAL...............................5
INSTALLATION............................5
JUNCTION BLOCK
DESCRIPTION............................6
OPERATION.............................6
REMOVAL...............................6
INSTALLATION............................7
POWER DISTRIBUTION CENTER
DESCRIPTION............................7
OPERATION.............................8
REMOVAL...............................8
INSTALLATION............................8
POWER OUTLET
DESCRIPTION............................9
OPERATION.............................10
DIAGNOSIS AND TESTING.................10
POWER OUTLET.......................10
REMOVAL..............................10
INSTALLATION...........................11
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 fuses
²Cartridge 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 thepower distribution system components. Refer to the
index in this service manual for the location of com-
plete circuit diagrams for the various power distribu-
tion system components.
OPERATION
The power distribution system for this vehicle is
designed to provide safe, reliable, and centralized dis-
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.
BR/BE8W-97 POWER DISTRIBUTION 8W - 97 - 1

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 a
fuse 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 bottomof 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 & TESTING - CIGAR LIGHTER
For complete circuit diagrams, refer toCigar
Lighterin Wiring Diagrams.
WARNING: ON VEHICLES EQUIPPED WITH AIR-
BAGS, REFER TO GROUP 8M - PASSIVE
RESTRAINT SYSTEMS BEFORE ATTEMPTING ANY
STEERING WHEEL, STEERING COLUMN, OR
INSTRUMENT PANEL COMPONENT DIAGNOSIS OR
SERVICE. FAILURE TO TAKE THE PROPER PRE-
CAUTIONS COULD RESULT IN ACCIDENTAL AIR-
BAG 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
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-Terminal Pick Kit 6680
8W - 97 - 2 8W-97 POWER DISTRIBUTIONBR/BE

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, usinga 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.
(8) Remove the cigar lighter or power outlet mount
from the instrument panel.
INSTALLATION
(1) Install the cigar lighter or power outlet mount
into the instrument panel.
(2) Reconnect the instrument panel wire harness
connector to the cigar lighter or power outlet recep-
tacle base connector receptacle.
(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.
Fig. 1 Cigar Lighter and Power Outlet
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)

(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
An automatic resetting circuit breaker in the junc-
tion block is used to protect the system from a short
circuit, or from an overload condition caused by an
obstructed or stuck seat adjuster.
The circuit breaker cannot be repaired and, if
faulty or damaged, it must be replaced.
DIAGNOSIS & 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 currentlevels 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 Systemin the
index of this service manual for the charging system
diagnostic procedures. Refer toPower Distribution
in the index of this service manual for the location of
complete PDC circuit 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
to service. Refer toCharging Systemin the index of
this service manual for the charging system diagnos-
tic procedures.
(1) Position the generator cartridge fuse onto the
two B(+) terminal stud bus bars within the PDC.
(2) Install and tighten the two screws that secure
the generator cartridge fuse to the two B(+) terminal
stud bus bars within the PDC. Tighten the screws to
3.4 N´m (30 in. lbs.).Be certain that both screws
are tightened to the proper torque value.
(3) Install and latch the cover onto the PDC.
(4) Reconnect the battery negative cable.
IOD FUSE
DESCRIPTION
All vehicles are equipped with an Ignition-Off
Draw (IOD) fuse (Fig. 3) that is disconnected within
the Junction Block (JB) when the vehicle is shipped
from the factory. Dealer personnel are to reconnect
the IOD fuse in the JB as part of the preparation
8W - 97 - 4 8W-97 POWER DISTRIBUTIONBR/BE
CIGAR LIGHTER OUTLET (Continued)