2001 DODGE RAM Ac control

(3) If the multi-function switch fails any of the
continuity or resistance tests, replace the faulty
switch unit as required.
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) If the vehicle is so equipped, unscrew the lever
from the tilt steering column adjuster mechanism
located on the left side of the column just below the
multi-function switch control stalk. Turn the lever
counterclockwise to unscrew it from the adjuster.
(3) From below the steering column, remove the
two outboard screws that secure the upper shroud to
the lower outer shroud (Fig. 26).
(4) Press carefully inward on each side of the outer
shrouds to release the snap features and remove the
upper outer shroud from the lower outer shroud.
(5) From below the steering column, remove the
one center screw that secures the lower outer shroud
to the steering column housing.
(6) Remove the lower outer shroud from the steer-
ing column.
(7) From below the steering column, remove the
two screws that secure the lower inner shroud to the
steering column housing and the upper inner shroud.
(8) Press carefully inward on the gearshift lever
side of the inner shrouds to release the snap features
and remove the lower inner shroud from the steering
column.
(9) Carefully lift the upper inner shroud upward
far enough to access the multi-function switch
mounting screws.(10) Remove the two tamper proof screws (a Snap
On tamper proof Torx bit TTXR20B2 or equivalent is
required) that secure the multi-function switch to the
steering column housing.
(11) Gently pull the multi-function switch away
from the steering column far enough to access and
remove the screw that secures the instrument panel
wire harness connector for the multi-function switch
to the switch connector receptacle (Fig. 27).
(12) Disconnect the instrument panel wire harness
connector from the multi-function switch connector
receptacle.
(13) Remove the multi-function switch from the
steering column.
Fig. 26 Steering Column Shrouds Remove/Install -
Typical
1 - STEERING WHEEL
2 - TILT LEVER
3 - UPPER SHROUD
4 - PANEL BRACKET
5 - SPACER
6 - TOE PLATE
7 - NUT
8 - LOWER SHROUD
9 - CLOCK SPRING
10 - NUT
BR/BELAMPS/LIGHTING - EXTERIOR 8L - 27
MULTI-FUNCTION SWITCH (Continued)

INSTALLATION
(1) Position retainer on rear fender.
(2) Install screws attaching lamp retainer to rear
fender.
(3) Engage lamp bulb socket to lamp.
(4) Position and press ID lamp in retainer.
(5) Connect the battery negative cable.
PARK/TURN SIGNAL LAMP
REMOVAL
(1) Disconnect and isolate the battery negative
cable.
(2) Remove park and turn signal lamp.
(3) Rotate bulb socket 1/4 turn counterclockwise
and pull turn signal lamp socket from back of lamp.
(4) Pull park and turn signal lamp bulb from
socket.
INSTALLATION
(1) Install park and turn signal lamp bulb in
socket.
(2) Install park and turn signal lamp socket into
back of lamp.
(3) Install park/turn signal lamp.
(4) Connect the battery negative cable.
PARK/TURN SIGNAL LAMP
UNIT
REMOVAL
(1) Disconnect and isolate the battery negative
cable.
(2) Remove screw attaching the park lamp to
headlamp module.
(3) Grasp lamp and pull forward to disengage clip
attaching park/turn lamp to headlamp module.
(4) Separate park lamp headlamp module.
(5) Rotate park/turn signal socket 1/4 turn
counter-clockwise and remove from back of lamp.
(6) Remove side marker socket from back of lamp.
(7) Separate park/turn signal lamp from vehicle.
INSTALLATION
(1) Install side marker socket from back of lamp.
(2) Install park/turn signal socket in back of lamp.
(3) Install park/turn signal lamp in vehicle.
(4) Install screw attaching the park lamp to head-
lamp module.
(5) Connect the battery negative cable.
TAIL LAMP
DESCRIPTION
There are two types of tail lamp modules used on
the Ram Truck. One type is integrated into the
pick-up bed, The other is a bracket mounted module
used on the Ram Truck Cab and Chassis. The Cab
and Chassis module is made up of a housing, lens,
and two bulbs. This type of module has license plate
illumination built into the lens. The integrated pick
up module contains a housing, lens, and two bulbs. A
dual filament bulb is used for tail, stop, and turn sig-
nal operations. A separate bulb is used for back-up
illumination.
OPERATION
Tail lamp functions are controlled by the headlamp
switch. Turn signal operations are controlled by the
multifunction switch. Stop lamp functions are con-
trolled by the stoplamp switch. The back-up lamps
are controlled by the back-up lamp switch on the
transmission.
REMOVAL
CHASSIS CAB
(1) Disconnect and isolate the battery negative
cable.
(2) Remove screws holding tail lamp lens to lamp
body.
Fig. 28 Side Identification Lamps
1 - FENDER
2 - U-NUT
3 - IDENTIFICATION LAMP
4 - RETAINER
5 - U-NUT
BR/BELAMPS/LIGHTING - EXTERIOR 8L - 29
OUTBOARD IDENTIFICATION LAMP (Continued)

(3) Separate lens from lamp.
(4) Grasp bulb, push in slightly and rotate 1/2 turn
counter-clockwise.
PICKUP
(1) Disconnect and isolate the battery negative
cable.
(2) Remove screws from tail lamp.
(3) Grasp lamp, firmly pull lamp rearward to dis-
engage retaining studs.
(4) Remove socket from tail lamp.
(5) Separate tail lamp from cargo box.
(6) Pull bulb from socket.
INSTALLATION
CHASSIS CAB
(1) Install bulb in socket.
(2) Install lamp lens.
(3) Connect the battery negative cable.
PICKUP
(1) Install bulb in socket.
(2) Install socket in tail lamp.
(3) Position tail lamp in cargo box, engage retain-
ing studs and install screws.
(4) Connect the battery negative cable.
TAIL LAMP UNIT
REMOVAL
CAB CHASSIS
(1) Disconnect and isolate the battery negative
cable.
(2) Remove nuts attaching tail lamp to mounting
bracket (Fig. 29).
(3) Disengage tail lamp wire connector from body
wire harness.
(4) Separate tail lamp from vehicle.
PICKUP
(1) Disconnect and isolate the battery negative
cable.
(2) Remove screws from tail lamp (Fig. 30).
(3) Grasp lamp, firmly pull lamp rearward to dis-
engage retaining studs.
(4) Remove socket from tail lamp.
(5) Separate tail lamp from cargo box.
(6) Pull bulb from socket.
INSTALLATION
CAB CHASSIS
(1) Position tail lamp on vehicle.(2) Engage tail lamp wire connector to body wire
harness.
(3) Install nuts attaching tail lamp to mounting
bracket.
(4) Connect the battery negative cable.
PICKUP
(1) Install bulb in socket.
(2) Install socket in tail lamp.
(3) Position tail lamp in cargo box, engage retain-
ing studs and install screws.
(4) Connect the battery negative cable.
TURN SIGNAL CANCEL CAM
DESCRIPTION
The turn signal cancel cam is concealed within the
steering column below the steering wheel. The turn
signal cancel cam consists of two lobes that are inte-
gral to the lower surface of the clockspring rotor. The
clockspring mechanism provides turn signal cancella-
tion as well as a constant electrical connection
between the horn switch, driver airbag, speed control
switches, and remote radio switches on the steering
wheel and the instrument panel wire harness on the
steering column. The housing of the clockspring is
secured to the steering column and remains station-
Fig. 29 Tail, Brake, Turn Signal and Back-up
LampsÐCab Chassis
1 - LICENCE PLATE BRACKET
2 - FRAME
3 - TAILLAMP MOUNTING BRACKET
4 - TAILLAMP-BRAKE LAMP-BACKUP LAMP HOUSING
8L - 30 LAMPS/LIGHTING - EXTERIORBR/BE
TAIL LAMP (Continued)

ary. The rotor of the clockspring, including the turn
signal cancel cam lobes rotate with the steering
wheel.
The turn signal cancel cam is serviced as a unit
with the clockspring and cannot be repaired. If faulty
or damaged, the entire clockspring unit must be
replaced. (Refer to 8 - ELECTRICAL/RESTRAINTS/
CLOCKSPRING - REMOVAL).
OPERATION
The turn signal cancel cam has two lobes molded
into the lower surface of the clockspring rotor. When
the turn signals are activated by moving the multi-
function switch control stalk to a detent position, a
turn signal cancel actuator is extended from the
inside surface of the multi-function switch housing
toward the center of the steering column and theturn signal cancel cam. When the steering wheel is
rotated during a turning maneuver, one of the two
turn signal cancel cam lobes will contact the turn sig-
nal cancel actuator. The cancel actuator latches
against the cancel cam rotation in the direction oppo-
site that which is signaled. In other words, if the left
turn signal detent is selected, the lobes of the cancel
cam will ratchet past the cancel actuator when the
steering wheel is rotated to the left, but will unlatch
the cancel actuator as the steering wheel rotates to
the right and returns to center, which will cancel the
turn signal event and release the control stalk from
the detent so it returns to the neutral Off position.
UNDERHOOD LAMP
REMOVAL
(1) Disconnect and isolate the battery negative
cable.
(2) Insert a small flat blade in the access slot
between the lamp base and lamp lens.
(3) Pry the lamp lens upward and remove the
lamp lens (Fig. 31).
(4) Depress the bulb terminal inward (Fig. 32) to
release the bulb.
Fig. 30 Tail, Brake, Turn Signal and Back-up Lamp
Bulb
1 - TAIL LAMP
2 - SCREW
3 - LIGHTING HARNESS
4 - BULB
5 - RETAINING CLIP
6 - RETAINING STUDS
Fig. 31 Underhood Lamp Lens
1 - LAMP
2 - LAMP LENS
BR/BELAMPS/LIGHTING - EXTERIOR 8L - 31
TURN SIGNAL CANCEL CAM (Continued)

LAMPS/LIGHTING - INTERIOR
TABLE OF CONTENTS
page page
LAMPS/LIGHTING - INTERIOR
SPECIFICATIONS........................33
DOME LAMP
REMOVAL..............................33
INSTALLATION...........................33
DOOR AJAR SWITCH
DESCRIPTION...........................34
DIAGNOSIS AND TESTING.................34
DOOR AJAR SWITCH....................34
REMOVAL..............................35
INSTALLATION...........................35GLOVE BOX LAMP AND SWITCH
REMOVAL..............................35
INSTALLATION...........................35
READING LAMP
DESCRIPTION...........................36
OPERATION.............................36
REMOVAL..............................36
INSTALLATION...........................36
VANITY LAMP
REMOVAL..............................37
INSTALLATION...........................37
LAMPS/LIGHTING - INTERIOR
SPECIFICATIONS
INTERIOR LAMPS
LAMP BULB
A/C HEATER CONTROL 158
ASH RECEIVER 161
CIGAR LIGHTER 161
HEADLAMP SWITCH 158
HEATER CONTROL 158
INSTRUMENT CLUSTER PC194
RADIO ASC
AIRBAG HIGH LINE PC194
AIRBAG LOW LINE PC74
ANTI-LOCK BRAKE PC74
BATTERY VOLTAGE PC194
BRAKE WARNING PC194
CHECK ENGINE PC74
ENGINE OIL PRESSURE PC74
FOUR WHEEL DRIVE PC194
HIGH BEAM PC194
LOW FUEL PC194
LOW WASHER FLUID PC74
MAINTENANCE
REQUIREDPC74
MESSAGE CENTER PC194
SEAT BELT PC74
LAMP BULB
TURN SIGNAL PC194
UPSHIFT PC74
DOME 1004
GLOVE COMPARTMENT 1891
VANITY MIRROR LAMP P/N 6501966
DOME LAMP
REMOVAL
(1) Using a small flat blade, pry the left side (driv-
er's side) of the dome lamp lens downward from
dome lamp.
(2) Allow the lens to hang down (Fig. 1) , this will
disengage the right side of the lamp (passenger's
side) from the headliner.
(3) Pull the right side of the lamp down and slide
the lamp to the right (Fig. 2) .
(4) Separate the lamp from the headliner.
(5) Disengage dome lamp wire connector from body
wire harness.
(6) Separate dome lamp from vehicle.
INSTALLATION
(1) Position dome lamp at headliner.
(2) Connect dome lamp wire connector to body
wire harness.
(3) Position the left side of the lamp in the head-
liner opening and slide lamp to the left.
(4) Push the right side of the lamp in the head-
liner opening and push the lamp lens up into the
lamp to secure.
BR/BELAMPS/LIGHTING - INTERIOR 8L - 33

DOOR AJAR SWITCH
DESCRIPTION
The door ajar switches are mounted to the door
hinge pillars. The switches close a path to ground for
the Central Timer Module (CTM) when a door is
opened, and open the ground path when a door is
closed.
The door ajar switches cannot be repaired and, if
faulty or damaged, they must be replaced.
DIAGNOSIS AND TESTING - DOOR AJAR
SWITCH
For circuit descriptions and diagrams, refer to the
appropriate wiring information. The wiring informa-tion includes wiring diagrams, proper wire and con-
nector repair procedures, details of wire harness
routing and retention, connector pin-out information
and location views for the various wire harness con-
nectors, splices and grounds.
WARNING: ON VEHICLES EQUIPPED WITH AIR-
BAGS, REFER TO ELECTRICAL, RESTRAINTS
BEFORE ATTEMPTING ANY STEERING WHEEL,
STEERING COLUMN, OR INSTRUMENT PANEL
COMPONENT DIAGNOSIS OR SERVICE. FAILURE
TO TAKE THE PROPER PRECAUTIONS COULD
RESULT IN ACCIDENTAL AIRBAG DEPLOYMENT
AND POSSIBLE PERSONAL INJURY.
(1) Rotate the headlamp switch knob counterclock-
wise to ensure that the dome lamps are not switched
off. Open the driver door and note whether the inte-
rior lamps light. They should light. If OK, (Refer to 8
- ELECTRICAL/LAMPS/LIGHTING - EXTERIOR/
HEADLAMP SWITCH - DIAGNOSIS AND TEST-
ING). If not OK, go to Step 2.
(2) Disconnect and isolate the battery negative
cable. Unplug the driver door ajar switch from its
wire harness connector. Check for continuity between
the ground circuit cavity of the driver door ajar
switch wire harness connector and a good ground.
There should be continuity. If OK, go to Step 3. If not
OK, repair the circuit to ground as required.
(3) Check for continuity between the door ajar
switch ground circuit terminal and each of the other
two terminals of the driver door ajar switch. There
should be continuity with the switch plunger
released, and no continuity with the switch plunger
depressed. If OK, go to Step 4. If not OK, replace the
faulty switch.
(4) Remove the Central Timer Module (CTM) from
its mounting bracket to access the CTM wire harness
connectors (Refer to 8 - ELECTRICAL/ELECTRONIC
CONTROL MODULES/BODY CONTROL/CENTRAL
TIMER MODUL - REMOVAL). Unplug the 14-way
CTM wire harness connector. Check for continuity
between the driver door switch sense circuit cavity of
the 14-way CTM wire harness connector and a good
ground. There should be no continuity. If OK, go to
Step 5. If not OK, repair the short circuit as
required.
(5) Check for continuity between the driver door
switch sense circuit cavities of the 14-way CTM wire
harness connector and the driver door ajar switch
wire harness connector. There should be continuity. If
OK, (Refer to 8 - ELECTRICAL/LAMPS/LIGHTING -
EXTERIOR/HEADLAMP SWITCH - DIAGNOSIS
AND TESTING) If not OK, repair the open circuit as
required.
Fig. 1 Dome Lamp Lens
1 - HEADLINER
2 - CONNECTOR
3 - DOME LAMP
4 - LENS
5 - BULB
Fig. 2 Dome Lamp
1 - SLIDE LAMP
8L - 34 LAMPS/LIGHTING - INTERIORBR/BE
DOME LAMP (Continued)

(5) Reconnect the battery negative cable.
VANITY LAMP
REMOVAL
(1) Insert a flat blade into the slot at front of lens.
(2) Rotate blade until lens pops out of lamp.
(3) Remove lens from housing.(4) Remove bulb from lamp terminals.
INSTALLATION
(1) Install bulb into lamp terminals.
(2) Place one side of lens into housing.
(3) Insure dim control is in place, and snap lens
into housing.
BR/BELAMPS/LIGHTING - INTERIOR 8L - 37
READING LAMP (Continued)

MESSAGE SYSTEMS
TABLE OF CONTENTS
page page
OVERHEAD CONSOLE
DESCRIPTION............................1
STANDARD PROCEDURE...................4
COMPASS CALIBRATION..................4
COMPASS VARIATION ADJUSTMENT........4
COMPASS DEMAGNETIZING...............5
REMOVAL...............................6
DISASSEMBLY............................7
ASSEMBLY..............................7
INSTALLATION............................8
SPECIAL TOOLS..........................8
COMPASS/MINI-TRIP COMPUTER
DESCRIPTION............................8OPERATION.............................9
DIAGNOSIS AND TESTING.................10
COMPASS MINI-TRIP COMPUTER..........10
REMOVAL..............................11
INSTALLATION...........................11
AMBIENT TEMP SENSOR
DESCRIPTION...........................11
OPERATION.............................11
DIAGNOSIS AND TESTING.................12
AMBIENT TEMPERATURE SENSOR........12
REMOVAL..............................12
INSTALLATION...........................13
OVERHEAD CONSOLE
DESCRIPTION
Two different overhead console units are available
factory-installed options on this model, base or pre-
mium. The base overhead console unit features a
garage door opener storage bin, a sunglasses storage
bin and two reading and courtesy lamps. The pre-
mium overhead console has all of the features of the
base unit, but adds a compass mini-trip computer.
See the owner's manual in the vehicle glove box for
more information on the features, use and operation
of all of the overhead console components and sys-
tems. Refer toOverhead Consolein the Contents of
Wiring Diagrams for complete circuit diagrams.
The premium overhead console (Fig. 1) includes
two front-mounted reading and courtesy lamps, a
garage door opener storage bin, and a sunglasses
storage bin. The premium overhead console includes
a compass mini-trip computer. The base overhead
console uses the same overhead console housing, but
has a computer cover plug installed in place of the
compass mini-trip computer display module lens and
push buttons.
The rear of the overhead console is secured to two
rear mounting holes in the inner roof panel by two
plastic hook formations that are integral to the over-
head console housing. The front of the overhead con-
sole is secured to the two front mounting holes of the
inner roof panel by two plastic latches that are inte-
gral to the overhead console housing. A single electri-
cal connection joins the overhead console wireharness to the roof wire harness for both the base
and premium overhead console units.
Following are general descriptions of the major
components used in the overhead console. See the
owner's manual in the vehicle glove box for more
information on the use and operation of the various
overhead console features.
GARAGE DOOR OPENER STORAGE BIN
A compartment near the front of the overhead con-
sole is designed to hold most garage door opener
remote control transmitters. The transmitter is
mounted within the compartment with an adhesive-
backed hook and loop fastener patch and, when the
compartment is closed, a push button in the center of
the compartment door is depressed to actuate the
transmitter.
A transmitter mounting kit including the adhesive-
backed hook and loop fastener material is available
for service. The garage door opener storage bin door
and the push button with three assorted length
adapter pegs are also available for service replace-
ment.
The garage door opener storage compartment door
is opened by pressing the integral latch towards the
front of the vehicle. When the compartment door is
opened, the push button unit is removed from the
compartment by squeezing the latch tabs and pulling
the unit downward. With the push button removed,
the garage door opener can be installed in the com-
partment using the adhesive-backed hook and loop
fastener material provided.
BR/BEMESSAGE SYSTEMS 8M - 1