DODGE RAM 2001 Service Repair Manual

REMOVAL
3.9L/5.2L/5.9L GASOLINE ENGINE
(1) Disconnect and isolate negative battery cable.
(2) Raise and support vehicle.
(3) Remove nut and lock washer securing starter
motor to mounting stud (Fig. 9).
(4) While supporting starter motor, remove upper
mounting bolt from starter motor.
(5) If equipped with automatic transmission, slide
cooler tube bracket forward on tubes far enough for
starter motor mounting flange to be removed from
lower mounting stud.
(6) Move starter motor towards front of vehicle far
enough for nose of starter pinion housing to clear
housing. Always support starter motor during this
process, do not let starter motor hang from wire har-
ness.
(7) Tilt nose downwards and lower starter motor
far enough to access and remove nut that secures
battery positive cable wire harness connector eyelet
to solenoid battery terminal stud. Do not let starter
motor hang from wire harness.(8) Remove battery positive cable wire harness
connector eyelet from solenoid battery terminal stud.
(9) Disconnect battery positive cable wire harness
connector from solenoid terminal connector recepta-
cle.
(10) Remove starter motor.
5.9L DIESEL ENGINE
(1) Disconnect and isolate negative cables of both
batteries.
(2) Raise and support vehicle.
(3) Pull back protective rubber boot from solenoid
battery terminal far enough to access and remove
nut securing battery positive cable wire harness con-
nector eyelet to solenoid battery terminal stud (Fig.
10).
(4) Remove nut securing battery positive cable
wire harness solenoid connector eyelet to solenoid
terminal stud.
(5) Remove battery positive cable wire harness
connector eyelets from solenoid terminal studs.
Fig. 7 Continuity Test Between Solenoid Terminal
and Field Coil Terminal - Typical
1 - OHMMETER
2 - SOLENOID TERMINAL
3 - FIELD COIL TERMINAL
Fig. 8 Continuity Test Between Solenoid Terminal
and Solenoid Case - Typical
1 - SOLENOID TERMINAL
2 - OHMMETER
3 - SOLENOID
Fig. 9 Starter Motor Remove/Install - 3.9L/5.2L/5.9L
Gasoline Engine
1 - ENGINE
2 - STARTER MOUNTING FLANGE
3 - STUD
4 - STARTER MOTOR
5 - LOCK WASHER
6 - NUT
7 - BRACKET
8 - BOLT
9 - POSITIVE BATTERY CABLE WIRE HARNESS
10 - POSITIVE BATTERY CABLE WIRE HARNESS NUT
8F - 40 STARTINGBR/BE
ENGINE STARTER MOTOR (Continued)

(6) While supporting starter motor, remove three
bolts securing starter motor to flywheel housing (Fig.
10) and (Fig. 11).
(7) Remove starter motor from engine (certain die-
sel engines have an aluminum spacer mounted
between the starter and the starter mounting flange.
Note position and orientation of spacer before remov-
al).
8.0L GASOLINE ENGINE
(1) Disconnect and isolate negative battery cable.
(2) Raise and support vehicle.
(3) Remove nut securing battery positive cable
wire harness connector eyelet to solenoid battery ter-
minal stud (Fig. 12).
(4) Remove battery positive cable connector eyelet
from solenoid battery terminal stud.
(5) Disconnect battery positive cable wire harness
connector from solenoid terminal connector recepta-
cle.(6) Support starter motor and remove two bolts
securing starter motor to engine.
(7) Remove starter motor from engine.
INSTALLATION
3.9L/5.2L/5.9L GASOLINE ENGINE
(1) Connect wiring harness to starter motor and
tighten eyelet nut to 25 N´m (221 in. lbs.). Do not
allow starter motor to hang from wire harness.
(2) Position starter motor to starter mounting
flange.
(3) If equipped with automatic transmission, slide
cooler tube bracket into position.
(4) Loosely install upper bolt.
(5) Position lock washer and loosely install lower
nut.
(6) Tighten upper bolt to 67.8 N´m (50 ft. lbs.).
(7) Tighten lower nut to 67.8 N´m (50 ft. lbs.).
(8) Lower vehicle.
(9) Connect battery cable.
Fig. 10 Starter Motor Wire Harness Remove/Install -
5.9L Diesel Engine
1 - SOLENOID WIRE
2 - MOUNTING BOLTS (3)
3 - BATTERY TERMINAL
Fig. 11 Starter Motor Remove/Install - 5.9L Diesel
Engine
1 - MOUNTING BOLT
BR/BESTARTING 8F - 41
ENGINE STARTER MOTOR (Continued)

5.9L DIESEL ENGINE
(1) If equipped, position aluminum spacer to rear
of starter.
(2) Position starter motor to engine.
(3) Support starter and loosely install three
mounting bolts.
(4) Tighten 3 bolts to 43.4 N´m (32 ft. lbs.).
(5) Position wiring eyelets to starter studs and
install nuts. Tighten small nut to 6.2 N´m (55 in.
lbs.). Tighten large nut to 13.6 N´m (120 in. lbs.).
(6) Install protective rubber boot over stud.
(7) Lower vehicle.
(8) Connect battery cables to both batteries.
8.0L GASOLINE ENGINE
(1) Support starter motor and loosely install two
bolts securing starter motor to engine.
(2) Tighten 2 bolts to 67.8 N´m (50 ft. lbs.).
(3) Connect solenoid wire to solenoid terminal.
(4) Position battery cable eyelet to starter stud.
Install nut and tighten to 13.6 N´m (120 in. lbs.).
(5) Lower vehicle.
(6) Connect battery cable.
ENGINE STARTER MOTOR
RELAY
DESCRIPTION
The starter relay is an electromechanical device
that switches battery current to the pull-in coil of the
starter solenoid when ignition switch is turned to
Start position. The starter relay is located in the
Power Distribution Center (PDC) in the engine com-
partment. See PDC cover for relay identification and
location.
The starter relay is a International Standards
Organization (ISO) relay. Relays conforming to ISO
specifications have common physical dimensions, cur-
rent capacities, terminal patterns, and terminal func-
tions.
The starter relay cannot be repaired or adjusted
and, if faulty or damaged, it must be replaced.
OPERATION
The ISO relay consists of an electromagnetic coil, a
resistor or diode, and three (two fixed and one mov-
able) electrical contacts. The movable (common feed)
relay contact is held against one of the fixed contacts
(normally closed) by spring pressure. When electro-
magnetic coil is energized, it draws the movable con-
tact away from normally closed fixed contact, and
holds it against the other (normally open) fixed con-
tact.
When electromagnetic coil is de-energized, spring
pressure returns movable contact to normally closed
position. The resistor or diode is connected in parallel
with electromagnetic coil within relay, and helps to
dissipate voltage spikes produced when coil is de-en-
ergized.
DIAGNOSIS AND TESTING - STARTER RELAY
The starter relay (Fig. 13) is located in Power Dis-
tribution Center (PDC). Refer to PDC cover for relay
identification and location. For complete starter relay
wiring circuit diagrams, refer to 8, Wiring Diagrams.
(1) Remove starter relay from PDC.
(2) A relay in de-energized position should have
continuity between terminals 87A and 30, and no
continuity between terminals 87 and 30. If OK, go to
Step 3. If not OK, replace faulty relay.
(3) Resistance between terminals 85 and 86 (elec-
tromagnet) should be 7565 ohms. If OK, go to Step
4. If not OK, replace faulty relay.
(4) Connect 12V battery to terminals 85 and 86.
There should now be continuity between terminals
30 and 87, and no continuity between terminals 87A
and 30. If OK, perform Relay Circuit Test that fol-
lows. If not OK, replace faulty relay.
Fig. 12 Starter Motor Remove/Install - 8.0L Gasoline
Engine
1 - ENGINE
2 - BATTERY POSITIVE CABLE WIRE HARNESS
3 - NUT
4 - STARTER MOTOR
5 - SCREW AND WASHER (2)
8F - 42 STARTINGBR/BE
ENGINE STARTER MOTOR (Continued)

RELAY CIRCUIT TEST
(1) The relay common feed terminal cavity (30) is
connected to battery voltage and should be hot at all
times. If OK, go to Step 2. If not OK, repair open cir-
cuit to fuse in PDC as required.
(2) The relay normally closed terminal (87A) is
connected to terminal 30 in the de-energized position,
but is not used for this application. Go to Step 3.
(3) The relay normally open terminal (87) is con-
nected to common feed terminal (30) in the energized
position. This terminal supplies battery voltage to
starter solenoid field coils. There should be continu-
ity between cavity for relay terminal 87 and starter
solenoid terminal at all times. If OK, go to Step 4. If
not OK, repair open circuit to starter solenoid as
required.
(4) The coil battery terminal (86) is connected to
electromagnet in relay. It is energized when ignition
switch is held in Start position. On vehicles with
manual transmission, clutch pedal must be fully
depressed for this test. Check for battery voltage at
cavity for relay terminal 86 with ignition switch in
Start position, and no voltage when ignition switch is
released to On position. If OK, go to Step 5. If not
OK with automatic transmission, check for open or
short circuit to ignition switch and repair, if required.
If circuit to ignition switch is OK, refer toIgnition
Switch and Key Lock Cylinder. If not OK with a
manual transmission, check circuit between relay
and clutch pedal position switch for open or a short.
If circuit is OK, refer toClutch Pedal Position
Switchin 6 , Clutch.(5)
The coil ground terminal (85) is connected to the
electromagnet in the relay. On vehicles with manual
transmission, it is grounded at all times. On vehicles
with automatic transmission, it is grounded through
park/neutral position switch only when gearshift selec-
tor lever is in Park or Neutral positions. Check for con-
tinuity to ground at cavity for relay terminal 85. If not
OK with manual transmission, repair circuit to ground
as required. If not OK with automatic transmission,
check for pen or short circuit to park/neutral position
switch and repair, if required. If circuit to park/neutral
position switch is OK, refer toPark/Neutral Position
Switch
in 21, Transmission.
REMOVAL
(1) Disconnect and isolate negative battery cable
(both negative cables if diesel).
(2) Remove cover from Power Distribution Center
(PDC) (Fig. 14).
(3) Refer to PDC cover for relay identification and
location.
(4) Remove starter relay from PDC.
INSTALLATION
(1)Position starter relay in proper receptacle in PDC.
(2) Align starter relay terminals with terminal
cavities in PDC receptacle.
(3)
Push down firmly on starter relay until terminals
are fully seated in terminal cavities in PDC receptacle.
(4) Install PDC cover..
(5) Reconnect negative battery cable(s).
Fig. 13 Starter Relay
TERMINAL LEGEND
NUMBER IDENTIFICATION
30 COMMON FEED
85 COIL GROUND
86 COIL BATTERY
87 NORMALLY OPEN
87A NORMALLY CLOSED
Fig. 14 Power Distribution Center
1 - EYELET
2 - NUT
3 - POWER DISTRIBUTION CENTER
4 - POSITIVE CABLE
5 - SCREW
6 - NEGATIVE CABLE
7 - EYELET
8 - CLIP
BR/BESTARTING 8F - 43
ENGINE STARTER MOTOR RELAY (Continued)

HEATED SYSTEMS
TABLE OF CONTENTS
page page
HEATED MIRRORS......................... 1 HEATED SEATSYSTEM..................... 5
HEATED MIRRORS
TABLE OF CONTENTS
page page
HEATED MIRRORS
DESCRIPTION............................1
OPERATION.............................2
DIAGNOSIS AND TESTING..................2
HEATED MIRROR SYSTEM................2
MIRROR SWITCH
DESCRIPTION............................3
OPERATION.............................3DIAGNOSIS AND TESTING..................3
HEATED MIRROR SWITCH................3
HEATED MIRROR GRID
DESCRIPTION............................4
OPERATION.............................4
DIAGNOSIS AND TESTING..................0
HEATED MIRROR GRID...................4
HEATED MIRRORS
DESCRIPTION - HEATED MIRROR SYSTEM
Electrically heated outside rear view mirrors are
an additional factory-installed option on models that
are equipped with factory-installed dual power mir-
rors. Vehicles with this option can be visually identi-
fied by the International Control and Display Symbol
icon for rear window defogger, which appears on the
lower inboard corner of each outside mirror glass
(Fig. 1); or, by the heated mirror switch that is
located in the lower left corner of the a/c heater con-
trol unit face plate. The heated mirror system helps
the vehicle operator maintain outside rear view mir-
ror visibility during inclement operating conditions
by keeping both outside mirror glasses clear of ice,
snow, or fog. The heated mirror system for this vehi-
cle includes the following major components:
²The heated mirror switch, including the heated
mirror system solid state electronic control logic and
timer circuitry, the heated mirror relay and the
heated mirror system indicator lamp. All of these
components are integral to the a/c heater control unit
on the instrument panel.
²The two outside mirror heating grids, which are
integral to the power outside mirror units.
Following are general descriptions of the major
components in the heated mirror system. See the
owner's manual in the vehicle glove box for more
information on the features, use and operation of the
heated mirror system.
Fig. 1 HEATED MIRROR
1 - POWER HEATED OUTSIDE REAR VIEW MIRROR
2 - REAR WINDOW DEFOGGER ICON
BR/BEHEATED SYSTEMS 8G - 1

OPERATION - HEATED MIRROR SYSTEM
The solid state electronic control logic and timer
circuitry for the heated mirror system receives bat-
tery current from a fuse in the Junction Block (JB)
only when the ignition switch is in the On or Start
positions. After the heated mirror system is turned
On, the electronic control logic and timer circuitry
will automatically turn the system off after a pro-
grammed time interval of about fifteen minutes.
After the initial time interval has expired, if the
heated mirror switch is depressed and released a sec-
ond time during the same ignition cycle, the elec-
tronic control logic and timer circuitry will
automatically turn the heated mirror system off after
a programmed time interval of about five minutes.
The heated mirror system will be shut off automati-
cally if the ignition switch is turned to the Off or
Accessory positions. After the heated mirror system
is turned On, it can also be turned off manually by
depressing and releasing the heated mirror switch a
second time.
When the heated mirror system is turned On, the
heated mirror system control logic and timer cir-
cuitry energizes the heated mirror system indicator
lamp and the heated mirror relay. When energized,
the heated mirror relay supplies fused ignition
switch output (run/start) current from a fuse in the
JB to the outside mirror heating grids located behind
the mirror glass of each of the outside rear view mir-
rors. When energized, each of the outside mirror
heating grids produces enough heat to warm the
glass of the outside rear view mirrors.
DIAGNOSIS AND TESTING - HEATED MIRROR
SYSTEM
If only one of the outside mirror heating grids is
inoperative, perform continuity checks on the circuits
and heater grid for that mirror only. If both outside
mirror heating grids are inoperative, proceed with
the heated mirror system diagnosis as follows. (Refer
to Appropriate Wiring Information).
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.The operation of the heated mirror system can be
confirmed in one of the following manners:
²Turn the ignition switch to the On position.
While monitoring the instrument panel voltmeter,
momentarily depress and release the heated mirror
switch. When the heated mirror system is turned On,
a distinct voltmeter needle deflection should be
noted.
²Turn the ignition switch to the On position.
Momentarily depress and release the heated mirror
switch to turn the heated mirror system On. The
heated mirror operation can be checked by feeling
the outside rear view mirror glass. A distinct differ-
ence in temperature between the unheated and
heated mirror glass can be detected within three to
four minutes of system operation.
The above checks will confirm system operation.
Illumination of the heated mirror system indicator
lamp means that there is electrical current available
at the heated mirror relay, but does not confirm that
the electrical current is reaching the outside mirror
heating grids.
If the heated mirror system does not operate, the
problem should be isolated in the following manner:
(1) Confirm that the ignition switch is in the On
position.
(2) Check the fuses in the Power Distribution Cen-
ter (PDC) and in the Junction Block (JB). The fuses
must be tight in their receptacles and all electrical
connections must be secure.
When the above steps have been completed and
both outside mirror heating grids are still inopera-
tive, one or more of the following is faulty:
²Heated mirror switch, electronic control logic
and timer circuitry, and heated mirror relay.
²Heated mirror wire harness circuits or connec-
tors.
²Outside mirror heating grid (both mirror grids
would have to be faulty).
If turning On the heated mirror system produces a
severe voltmeter deflection or fuse failures, check for
a shorted circuit between the output of the heated
mirror relay and the outside mirror heating grids.
8G - 2 HEATED MIRRORSBR/BE
HEATED MIRRORS (Continued)

MIRROR SWITCH
DESCRIPTION
The heated mirror switch, the heated mirror sys-
tem indicator lamp, the heated mirror system solid
state electronic control logic and timer circuitry and
the heated mirror relay are all integral to the a/c
heater control, which is located between the instru-
ment cluster and the radio near the center of the
instrument cluster bezel on the instrument panel.
The heated mirror switch and the heated mirror sys-
tem indicator lamp are visible in the lower left corner
of the a/c heater control face plate (Fig. 2).
The heated mirror switch, the heated mirror sys-
tem indicator lamp, the heated mirror system solid
state electronic control logic and timer circuitry and
the heated mirror relay cannot be repaired. If any of
these components is damaged or faulty, the entire a/c
heater control must be replaced. (Refer to 24 - HEAT-
ING & AIR CONDITIONING/CONTROLS/A/C
HEATER CONTROL - REMOVAL)
OPERATION
The momentary-type heated mirror switch provides
a hard-wired battery current signal to the heated
mirror system electronic control logic circuitry each
time it is depressed. In response to the heated mirror
switch input, the electronic control logic and timer
circuitry energizes or de-energizes the amber heated
mirror system indicator lamp next to the heated mir-
ror switch to indicate that the heated mirror systemis turned On or Off. The electronic control logic and
timer circuitry also energizes or de-energizes the
heated mirror relay, which controls the feed of elec-
trical current to the outside mirror heating grids.
The heated mirror system electronic control logic
and timer circuitry is programmed to turn the heated
mirror system Off automatically after about fifteen
minutes of operation. If the heated mirror system is
turned On a second time following an initial time-out
event during the same ignition switch cycle, the
heated mirror system electronic control logic and
timer circuit is programmed to turn the system Off
automatically after about five minutes. When the
electronic control logic and timer circuit detects that
a programmed time interval has elapsed, it will auto-
matically de-energize the heated mirror system indi-
cator lamp and the heated mirror relay. The heated
mirror system will also be turned Off if the heated
mirror switch is depressed while the system is
turned On, or if the ignition switch is turned to the
Off or Accessory positions.
DIAGNOSIS AND TESTING - HEATED MIRROR
SWITCH
The heated mirror switch, the solid state electronic
heated mirror system control logic and timer cir-
cuitry, the heated mirror system indicator lamp and
the heated mirror relay are all integral to the a/c
heater control. For circuit descriptions and diagrams
(Refer to Appropriate Wiring Information).
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) Check the fused ignition switch output (run/
start) fuse in the Junction Block (JB). If OK, go to
Step 2. If not OK, repair the shorted circuit or com-
ponent 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/start) fuse in the JB. If OK, go to Step 3.
If not OK, repair the open circuit to the ignition
switch as required.
Fig. 2 HEATED MIRROR SWITCH
1 - A/C HEATER CONTROL
2 - HEATED MIRROR SWITCH
3 - HEATED MIRROR SYSTEM INDICATOR LAMP
BR/BEHEATED MIRRORS 8G - 3

(3) Disconnect and isolate the battery negative
cable. Disconnect the 3-way instrument panel wire
harness connector for the heated mirror switch from
the heated mirror switch connector receptacle on the
back of the a/c heater control. Check for continuity
between the ground circuit cavity of the wire harness
connector and a good ground. There should be conti-
nuity. If OK, go to Step 4. If not OK, repair the open
ground circuit to ground as required.
(4) Reconnect the battery negative cable. Turn the
ignition switch to the On position. Check for battery
voltage at the fused ignition switch output (run/start)
circuit cavity of the 3-way instrument panel wire
harness connector for the heated mirror switch. If
OK, go to Step 5. If not OK, repair the open fused
ignition switch output (run/start) circuit to the fuse
in the JB as required.
(5) Turn the ignition switch to the Off position.
Disconnect and isolate the battery negative cable.
Reconnect the 3-way instrument panel wire harness
connector for the heated mirror switch to the heated
mirror switch connector receptacle on the back of the
a/c heater control. Reconnect the battery negative
cable. Turn the ignition switch to the On position.
Depress and release the heated mirror switch. The
amber heated mirror system indicator lamp next to
the heated mirror switch button should light. If OK,
go to Step 6. If not OK, replace the faulty a/c heater
control.
(6) Back probe the fused heated mirror relay out-
put circuit cavity of the 3-way instrument panel wire
harness connector for the heated mirror switch on
the back of the a/c heater control and check for volt-
age (battery voltage less the resistance in both out-
side mirror heating grids). If OK, (Refer to 8 -
ELECTRICAL/HEATED MIRRORS/HEATED MIR-
ROR GRID - DIAGNOSIS AND TESTING).
HEATED MIRROR GRID
DESCRIPTION
Vehicles equipped with the optional heated mirror
system have an electrically operated heating grid
located behind the mirror glass of each power oper-
ated outside rear view mirror. The outside mirror
heating grid consists of two thin laminations of plas-
tic that approximate the outer dimensions and shape
of the mirror glass. A single length of resistor wire
weaves in a back and forth pattern between, and is
held in place by the two thin laminations of plastic.
The two ends of the resistor wire terminate near the
inboard edge of the grid, where they are soldered to
the ground feed and battery current feed wires con-
tained in the power mirror wire harness. The heating
grid is then sandwiched between the back of themolded plastic mirror glass case and the mirror
glass, where it remains in direct contact with the
back of the mirror glass at all times.
The outside mirror heating grids cannot be
repaired and, if faulty or damaged, the entire outside
power mirror unit must be replaced. Refer to Power
Mirrors for the service procedures.
OPERATION
One end of the outside mirror heating grid resistor
wire is connected to a ground feed at all times
through a body ground screw located inside the left
rear corner of the truck cab. Battery current is
directed to the other end of the outside mirror heat-
ing grid resistor wire by the energized heated mirror
relay when the heated mirror switch is in the On
position. As electrical current passes through the
heating grid, the resistance of the wire in the heating
grid converts some of that electrical current into
heat. The heat produced by the heating grid is then
conducted through the back of the mirror glass to
help keep the glass clear of ice, snow or fog.
DIAGNOSIS AND TESTING - HEATED MIRROR
GRID
For circuit descriptions and diagrams (Refer to
Appropriate Wiring Information).
(1) Disconnect and isolate the battery negative
cable. Disconnect the door wire harness connector
from the power mirror wire harness connector at the
power mirror with the inoperative heating grid.
Check for continuity between the ground circuit cav-
ity in the door wire harness connector for the power
mirror and a good ground. If OK, go to Step 2. If not
OK, repair the open ground circuit to ground as
required.
(2) Reconnect the battery negative cable. Turn the
ignition switch to the On position. Turn on the
heated mirror system. Check for voltage (battery
voltage less the resistance in the outside mirror heat-
ing grid that is still connected) at the fused heated
mirror relay output circuit cavity in the door wire
harness connector for the power mirror. If OK, go to
Step 3. If not OK, repair the open fused heated mir-
ror relay output circuit to the heater and air condi-
tioner control unit as required.
(3) Check the outside mirror heating grid by test-
ing for continuity between the ground circuit and the
fused heated mirror relay output circuit cavities in
the power mirror wire harness connector. There
should be continuity. If not OK, replace the faulty
power mirror. If OK, check the resistance through
the outside mirror heating grid. The correct resis-
tance should be from 10 to 16 ohms when measured
at an ambient temperature of 21É C (70É F). If not
OK, replace the faulty power mirror.
8G - 4 HEATED MIRRORSBR/BE
MIRROR SWITCH (Continued)

HEATED SEAT SYSTEM
TABLE OF CONTENTS
page page
HEATED SEAT SYSTEM
DESCRIPTION............................5
OPERATION.............................6
DIAGNOSIS AND TESTING..................6
HEATED SEAT SYSTEM..................6
DRIVER SEAT HEATER SWITCH
DESCRIPTION............................7
OPERATION.............................7
DIAGNOSIS AND TESTING..................8
HEATED SEAT SWITCH...................8
REMOVAL...............................9
INSTALLATION............................9
HEATED SEAT ELEMENT
DESCRIPTION...........................10
OPERATION.............................10
DIAGNOSIS AND TESTING.................11HEATED SEAT ELEMENT & SENSOR.......11
HEATED SEAT RELAY
DESCRIPTION...........................11
OPERATION.............................12
DIAGNOSIS AND TESTING.................12
HEATED SEAT RELAY...................12
REMOVAL..............................13
INSTALLATION...........................13
PASSENGER SEAT HEATER SWITCH
DESCRIPTION...........................13
OPERATION.............................14
DIAGNOSIS AND TESTING.................14
HEATED SEAT SWITCH..................14
REMOVAL..............................15
INSTALLATION...........................16
HEATED SEAT SYSTEM
DESCRIPTION
Individually controlled electrically heated front
seats are available factory-installed optional equip-
ment on the Ram quad cab models that are also
equipped with the optional SLT Plus (leather) trimpackage. Vehicles with this option can be visually
identified by the two separate heated seat switches
mounted in a bezel located in the lower right corner
of the instrument cluster bezel, next to the radio
receiver (Fig. 1). The heated seat system allows the
front seat driver and passenger to select from two
different levels of supplemental electrical seat heat-
ing, or no seat heating to suit their individual com-
fort requirements. The heated seat system for this
vehicle includes the following major components:
²The heated seat switches, including two heated
seat Light-Emitting Diode (LED) indicator lamps and
an incandescent back lighting bulb for each switch.
²The heated seat module, also referred to as the
Seat Heat Interface Module (SHIM), which contains
the solid state electronic control and diagnostic logic
circuitry for the heated seat system. Refer to the
Electronic Control Modules section of the service
manual for heated seat module information.
²The heated seat elements and sensors, which
are integral to the individual front seat cushion and
front seat back trim covers.
²The heated seat relay, which controls the avail-
ability of battery current to the heated seat module
or SHIM.
Following are general descriptions of the major
components in the heated seat system. See the own-
er's manual in the vehicle glove box for more infor-
mation on the features, use and operation of the
heated seat system. Refer toPower Seatin the
index of this service manual for the location of com-
plete heated seat system wiring diagrams.
Fig. 1 Heated Seat System Switches
1 - RADIO RECEIVER
2 - HEATED SEAT SWITCHES
BR/BEHEATED SEAT SYSTEM 8G - 5