2001 DODGE RAM fuse

and receiving the proper messages on the CCD data
bus, that the CTM is receiving the proper hard wired
inputs, and that the power lock motors are being sent
the proper hard wired outputs by the CTM.
Refer to the appropriate wiring information. The
wiring information includes wiring diagrams, proper
wire and connector repair procedures, details of wire
harness routing and retention, connector pin-out
information and location views for the various wire
harness connectors, splices and grounds.
PRELIMINARY TESTS
To begin this test, note the system operation while
you actuate both the Lock and Unlock functions with
the power lock switches, the door cylinder lock switches,
and the RKE transmitter. Then, proceed as follows:
²If the entire power lock system fails to function
with the power lock switches, the door cylinder lock
switches, or the RKE transmitter, check the fused
B(+) fuse in the Junction Block (JB). If the fuse is
OK, proceed to the diagnosis of the power lock
motors. (Refer to 8 - ELECTRICAL/POWER LOCKS/
POWER LOCK MOTOR - DIAGNOSIS AND TEST-
ING).
²If the power lock system functions with both
power lock switches, and both door cylinder lock
switches, but not with the RKE transmitter, proceed
to the diagnosis of the transmitter. (Refer to 8 -
ELECTRICAL/POWER LOCKS/REMOTE KEYLESS
ENTRY TRANSMITTER - DIAGNOSIS AND TEST-
ING).
²
If the entire power lock system functions with the
RKE transmitter, and both door cylinder lock switches,
but not with one or both of the power lock switches, pro-
ceed to diagnosis of the power lock switches. (Refer to 8
- ELECTRICAL/POWER LOCKS/POWER LOCK
SWITCH - DIAGNOSIS AND TESTING).
²If the entire power lock system functions with
the RKE transmitter, and both power lock switches,
but not with one or both of the door cylinder lock
switches, proceed to diagnosis of the door cylinder
lock switches. (Refer to 8 - ELECTRICAL/POWER
LOCKS/DOOR CYLINDER LOCK SWITCH - DIAG-
NOSIS AND TESTING).
²If one power lock motor fails to operate with
both of the power lock switches, both of the door cyl-
inder lock switches and/or the RKE transmitter, pro-
ceed to diagnosis of the power lock motor. (Refer to 8
- ELECTRICAL/POWER LOCKS/POWER LOCK
MOTOR - DIAGNOSIS AND TESTING).
If the problem being diagnosed is related to one or
more of the electronic features (automatic locks, door
lock inhibit, enhanced accident response, illuminated
entry, panic mode, or RKE horn chirp), further diag-
nosis should be performed using a DRBIIItscan tool.
Refer to the appropriate diagnostic information.
DOOR CYLINDER LOCK
SWITCH
DESCRIPTION
A door cylinder lock switch is snapped onto the
back of the key lock cylinder inside each front door of
vehicles equipped with a high-line or premium Cen-
tral Timer Module (CTM). The door cylinder lock
switch is a resistor multiplexed momentary switch
that is hard wired in series between a body ground
and the CTM through the front door wire harness.
The door cylinder lock switches are driven by the key
lock cylinders and contain three internal resistors.
One resistor is used for the neutral switch position,
one for the Lock position, and one for the Unlock
position.
The door cylinder lock switches cannot be adjusted
or repaired and, if faulty or damaged, they must be
replaced.
OPERATION
The door cylinder lock switches are actuated by the
key lock cylinder when the key is inserted in the lock
cylinder and turned to the lock or unlock positions.
The door cylinder lock switch closes a path to ground
through one of three internal resistors for the Cen-
tral Timer Module (CTM) when the front door key
lock cylinder is in the Lock, Unlock, or Neutral posi-
tions. The CTM reads the switch status through an
internal pull-up, then uses this information as an
input for both power lock system and Vehicle Theft
Security System (VTSS) operation.
The door cylinder lock switches and circuits can be
diagnosed using conventional diagnostic tools and
methods.
DIAGNOSIS & TESTING - DOOR CYLINDER
LOCK SWITCH
Refer to the appropriate wiring information. The
wiring information includes wiring diagrams, proper
wire and connector repair procedures, details of wire
harness routing and retention, connector pin-out
information and location views for the various wire
harness connectors, splices and grounds.
(1) Disconnect the door cylinder lock switch pigtail
wire connector from the door wire harness connector.
(2) Using an ohmmeter, perform the switch resis-
tance checks between the two cavities of the door cyl-
inder lock switch pigtail wire connector. Actuate the
switch by rotating the key in the door lock cylinder
to test for the proper resistance values in each of the
three switch positions, as shown in the Door Cylinder
Lock Switch chart.
BR/BEPOWER LOCKS 8N - 5
POWER LOCKS (Continued)

the suspect transmitter does not, replace the faulty
RKE transmitter.
NOTE: Be certain to perform the RKE Transmitter
Programming procedure again following this test.
This procedure will erase the access code of the
test transmitter from the RKE receiver.
STANDARD PROCEDURE - RKE TRANSMITTER
PROGRAMMING
To program the Remote Keyless Entry (RKE)
transmitter access codes into the RKE receiver in the
high-line or premium Central Timer Module (CTM)
requires the use of a DRBIIItscan tool. Refer to the
appropriate diagnostic information.
STANDARD PROCEDURE - RKE TRANSMITTER
BATTERIES
The Remote Keyless Entry (RKE) transmitter case
snaps open and shut for battery access. To replace
the RKE transmitter batteries:
(1) Using a trim stick or a thin coin, gently pry at
the notch in the center seam of the RKE transmitter
case halves located near the key ring until the two
halves unsnap.
(2) Lift the back half of the transmitter case off of
the RKE transmitter.
(3) Remove the two batteries from the RKE trans-
mitter.
(4) Replace the two batteries with new Duracell
DL2016, or their equivalent. Be certain that the bat-
teries are installed with their polarity correctly ori-
ented.
(5) Align the two RKE transmitter case halves
with each other, and squeeze them firmly and evenly
together using hand pressure until they snap back
into place.
POWER LOCK SWITCH
DESCRIPTION
The power lock system can be controlled by a two-
way momentary switch integral to the power window
and lock switch and bezel unit on the trim panel of
each front door. Each power lock switch is illumi-
nated by a Light-Emitting Diode (LED) that is inte-
gral to the switch paddle. The LED of each switch is
illuminated whenever the ignition switch is in the
On position.
The power lock switches and their LEDs cannot be
adjusted or repaired and, if faulty or damaged, the
entire power window and lock switch and bezel unit
must be replaced.
OPERATION
On models with a base version of the Central
Timer Module (CTM), the power lock switches are
hard-wired to the power lock motors. The power lock
switch provides the correct battery and ground feeds
to the power lock motors to lock or unlock the door
latches.
On models with a high-line or premium version of
the CTM, the power lock switch controls battery cur-
rent signals to the lock and unlock sense inputs of
the CTM. The CTM then relays the correct battery
and ground feeds to the power lock motors to lock or
unlock the door latches.
DIAGNOSIS AND TESTING - POWER LOCK
SWITCH
The Light-Emitting Diode (LED) illumination
lamps for all of the power window and lock switch
and bezel unit switch paddles receive battery current
through the power window circuit breaker in the
Junction Block (JB). If all of the LEDs are inopera-
tive in either or both power window and lock switch
and bezel units, be certain to diagnose the power
window system before replacing the switch unit.
(Refer to 8 - ELECTRICAL/POWER WINDOWS -
DIAGNOSIS AND TESTING). If only one LED in a
power window and lock switch and bezel unit is inop-
erative, replace the faulty switch and bezel unit.
Refer to the appropriate wiring information. The wir-
ing information includes wiring diagrams, proper
wire and connector repair procedures, details of wire
harness routing and retention, connector pin-out
information and location views for the various wire
harness connectors, splices and grounds.
(1) Check the fused B(+) fuse (Fuse 13 - 10
ampere) in the Junction Block (JB). If OK, go to Step
2. If not OK, repair the shorted circuit or component
as required and replace the faulty fuse.
(2) Check for battery voltage at the fused B(+) fuse
(Fuse 13 - 10 ampere) in the JB. If OK, go to Step 3.
If not OK, repair the open fused B(+) circuit between
the JB and the Power Distribution Center (PDC) as
required.
(3) Disconnect and isolate the battery negative
cable. Remove the power window and lock switch and
bezel unit from the door trim panel. Disconnect the
door wire harness connector for the power window
and lock switch unit from the switch connector recep-
tacle.
(4) Reconnect the battery negative cable. Check for
battery voltage at the fused B(+) circuit cavity of the
door wire harness connector for the power window
and lock switch unit. If OK, go to Step 5. If not OK,
repair the open fused B(+) circuit between the power
window and lock switch unit and the JB as required.
8N - 8 POWER LOCKSBR/BE
REMOTE KEYLESS ENTRY TRANSMITTER (Continued)

POWER MIRRORS
TABLE OF CONTENTS
page page
POWER MIRRORS
DESCRIPTION...........................10
OPERATION.............................10
AUTOMATIC DAY / NIGHT MIRROR
DESCRIPTION...........................10
OPERATION.............................11
DIAGNOSIS AND TESTING.................11
AUTOMATIC DAY/NIGHT MIRROR..........11
REMOVAL..............................12
INSTALLATION...........................12
POWER MIRROR SWITCH
DESCRIPTION...........................12OPERATION.............................12
REMOVAL..............................12
INSTALLATION...........................13
SIDEVIEW MIRROR
DESCRIPTION...........................13
OPERATION.............................13
DIAGNOSIS AND TESTING.................13
SIDEVIEW MIRROR.....................13
REMOVAL..............................14
POWER MIRRORS
DESCRIPTION
AUTOMATIC DAY / NIGHT MIRROR
The automatic day/night mirror system is able to
automatically change the reflectance of the inside
rear view mirror in order to reduce the glare of head-
lamps approaching the vehicle from the rear. The
automatic day/night rear view mirror receives bat-
tery current through a fuse in the junction block only
when the ignition switch is in the On position.
OUTSIDE REAR VIEW MIRROR
The heated mirror option includes an electric heat-
ing grid behind the mirror glass in each outside mir-
ror, which can clear the mirror glass of ice, snow, or
fog. The heating grid receives fused battery current
through the heated mirror relay in the heater and air
conditioner control only when the ignition switch is
in the On position, and the heated mirror system is
turned on. (Refer to 8 - ELECTRICAL/HEATED
MIRRORS - DESCRIPTION) for more information.
Refer to the owner's manual in the vehicle glove
box for more information on the features, use and
operation of the power mirror system.
OPERATION
AUTOMATIC DAY / NIGHT MIRROR
A switch located on the bottom of the automatic
day/night mirror housing allows the vehicle operator
to select whether the automatic dimming feature is
operational. When the automatic day/night mirror isturned on, the mirror switch is lighted by an integral
Light-Emitting Diode (LED). The mirror will auto-
matically disable its self-dimming feature whenever
the vehicle is being driven in reverse.
Refer to the owner's manual in the vehicle glove
box for more information on the features, use and
operation of the automatic day/night mirror system.
OUTSIDE REAR VIEW MIRROR
The heated mirror option includes an electric heat-
ing grid behind the mirror glass in each outside mir-
ror, which can clear the mirror glass of ice, snow, or
fog. The heating grid receives fused battery current
through the heated mirror relay in the heater and air
conditioner control only when the ignition switch is
in the On position, and the heated mirror system is
turned on. (Refer to 8 - ELECTRICAL/HEATED
MIRRORS - OPERATION) for more information.
Refer to the owner's manual in the vehicle glove
box for more information on the features, use and
operation of the power mirror system.
AUTOMATIC DAY / NIGHT
MIRROR
DESCRIPTION
The automatic day/night mirror uses a thin layer
of electrochromic material between two pieces of con-
ductive glass to make up the face of the mirror.
When the mirror switch is in the On position, two
photocell sensors are used by the mirror circuitry to
monitor external light levels and adjust the reflec-
tance of the mirror.
8N - 10 POWER MIRRORSBR/BE

OPERATION
The ambient photocell sensor is located on the for-
ward-facing (windshield side) of the rear view mirror
housing, and detects the ambient light levels outside
of the vehicle. The headlamp photocell sensor is
located inside the rear view mirror housing behind
the mirror glass and faces rearward, to detect the
level of the light being received at the rear window
side of the mirror. When the circuitry of the auto-
matic day/night mirror detects that the difference
between the two light levels is too great (the light
level received at the rear of the mirror is much
higher than that at the front of the mirror), it begins
to darken the mirror.
The automatic day/night mirror circuitry also mon-
itors the transmission using an input from the
backup lamp circuit. The mirror circuitry is pro-
grammed to automatically disable its self-dimming
feature whenever it senses that the transmission
backup lamp circuit is energized.
The automatic day/night mirror is a completely
self-contained unit and cannot be repaired. If faulty
or damaged, the entire mirror assembly must be
replaced.
DIAGNOSIS AND TESTING - AUTOMATIC
DAY/NIGHT MIRROR
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.
(1) Check the fuse in the junction block. If OK, go
to Step 2. If not OK, repair the shorted circuit or
component as required replace the faulty fuse.
(2) Turn the ignition switch to the On position.
Check for battery voltage at the fuse in the junction
block. If OK, go to Step 3. If not OK, repair the open
circuit to the ignition switch as required.
(3) Turn the ignition switch to the Off position.
Disconnect and isolate the battery negative cable.
Unplug the wire harness connector from the auto-
matic day/night mirror (Fig. 1). Connect the battery
negative cable. Turn the ignition switch to the On
position. Check for battery voltage at the fused igni-
tion switch output (run/start) circuit cavity of the
automatic day/night mirror wire harness connector. If
OK, go to Step 4. If not OK, repair the open circuit to
the junction block as required.
(4) Turn the ignition switch to the Off position.
Disconnect and isolate the battery negative cable.
Check for continuity between the ground circuit cav-
ity of the automatic day/night mirror wire harness
connector and a good ground. There should be conti-nuity. If OK, go to Step 5. If not OK, repair the cir-
cuit to ground as required.
(5) Connect the battery negative cable. Turn the
ignition switch to the On position. Set the parking
brake. Place the transmission gear selector lever in
the Reverse position. Check for battery voltage at the
backup lamp switch output circuit cavity of the auto-
matic day/night mirror wire harness connector. If
OK, go to Step 6. If not OK, repair the open circuit
as required.
(6) Turn the ignition switch to the Off position.
Disconnect the battery negative cable. Plug in the
automatic day/night mirror wire harness connector.
Connect the battery negative cable. Turn the ignition
switch to the On position. Place the transmission
gear selector lever in the Neutral position. Place the
mirror switch in the On (LED in the mirror switch is
lighted) position. Cover the forward facing ambient
photocell sensor to keep out any ambient light.
NOTE: The ambient photocell sensor must be cov-
ered completely, so that no light reaches the sen-
sor. Use a finger pressed tightly against the sensor,
or cover the sensor completely with electrical tape.
(7) Shine a light into the rearward facing head-
lamp photocell sensor. The mirror glass should
darken. If OK, go to Step 8. If not OK, replace the
faulty automatic day/night mirror unit.
(8) With the mirror glass darkened, place the
transmission gear selector lever in the Reverse posi-
tion. The mirror should return to its normal reflec-
tance. If not OK, replace the faulty automatic day/
night mirror unit.
Fig. 1 Automatic Day/Night Mirror
BR/BEPOWER MIRRORS 8N - 11
AUTOMATIC DAY / NIGHT MIRROR (Continued)

(3) Remove the nut that secures the power mirror
switch to the driver side front door trim panel.
(4) Remove the trim panel from the inside of the
driver side front door. (Refer to 23 - BODY/DOOR -
FRONT/TRIM PANEL - REMOVAL) for the proce-
dures.
(5) Pull the trim panel away from the inner door
far enough to access the power mirror switch wire
harness connector.
(6) Unplug the power mirror switch wire harness
connector.
(7) Remove the power mirror switch from the back
of the door trim panel.
INSTALLATION
(1) Insert the power mirror switch to the back of
the door trim panel.
(2) Connect the power mirror switch to the har-
ness connector.
(3) Install the trim panel to the inside of the
driver side door. (Refer to 23 - BODY/DOOR -
FRONT/TRIM PANEL - INSTALLATION).
(4) Install the nut that secures the power mirror
switch to the driver side front door.
(5) Push the control knob on to the power mirror
switch.
(6) Connect the battery negative cable.
SIDEVIEW MIRROR
DESCRIPTION
Each power mirror head contains two electric
motors, two drive mechanisms, and the mirror glass.
One motor and drive controls mirror up-and-down
movement, and the other controls right-and-left
movement.
OPERATION
The power mirrors in vehicles equipped with the
available heated mirror system option also include an
electric heating grid located behind the mirror glass.
This heating grid is energized by the heated mirror
relay in the heater and air conditioner control only
when the ignition switch is in the On position, and
the heated mirror system is turned on. (Refer to 8 -
ELECTRICAL/HEATED MIRRORS - DESCRIP-
TION) for more information.
The power mirror assembly cannot be repaired. If
any component of the power mirror unit is faulty or
damaged, the entire assembly must be replaced.
DIAGNOSIS AND TESTING - SIDEVIEW
MIRROR
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.
(1) Check the fuses in the Power Distribution Cen-
ter (PDC) and 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(s).
(2) Check for battery voltage at the fuse in the
junction block. If OK, go to Step 3. If not OK, repair
the open circuit to the PDC as required.
(3) Disconnect and isolate the battery negative
cable. Remove the driver side door trim panel and
unplug the wire harness connector from the power
mirror switch. Connect the battery negative cable.
Check for battery voltage at the fused B(+) circuit
cavity in the door wire harness half of the power mir-
ror switch wire harness connector. If OK, go to Step
4. If not OK, repair the open circuit to the junction
block as required.
BR/BEPOWER MIRRORS 8N - 13
POWER MIRROR SWITCH (Continued)

POWER SEAT SYSTEM
TABLE OF CONTENTS
page page
POWER SEAT SYSTEM
DESCRIPTION...........................15
OPERATION.............................15
DIAGNOSIS AND TESTING.................15
POWER SEAT SYSTEM..................15
DRIVER POWER SEAT SWITCH
DESCRIPTION...........................16
OPERATION.............................16
DIAGNOSIS AND TESTING.................16
DRIVER POWER SEAT SWITCH...........16
REMOVAL..............................17
INSTALLATION...........................17
LUMBAR CONTROL SWITCH
DESCRIPTION...........................17
OPERATION.............................18
REMOVAL..............................18
LUMBAR MOTOR
DESCRIPTION...........................18
OPERATION.............................18
DIAGNOSIS AND TESTING.................18POWER LUMBAR ADJUSTER.............18
PASSENGER POWER SEAT SWITCH
DESCRIPTION...........................19
OPERATION.............................19
DIAGNOSIS AND TESTING.................19
PASSENGER POWER SEAT SWITCH.......19
REMOVAL..............................20
INSTALLATION...........................20
RECLINER MOTOR
DESCRIPTION...........................20
OPERATION.............................21
DIAGNOSIS AND TESTING.................21
POWER SEAT RECLINER................21
POWER SEAT TRACK
DESCRIPTION...........................21
OPERATION.............................21
DIAGNOSIS AND TESTING.................21
POWER SEAT TRACK...................21
REMOVAL..............................22
INSTALLATION...........................22
POWER SEAT SYSTEM
DESCRIPTION
The power seat system option allows the driver (or
passenger on SLT Plus with power seats) to electri-
cally adjust the seat position for optimum control and
comfort using the power seat switches located on the
outboard seat cushion side shield. The power seat
system allows the seating position to be adjusted for-
ward, rearward, front up, front down, rear up, or
rear down. The power seat system receives battery
current through a fuse in the Power Distribution
Center and a circuit breaker in the junction block,
regardless of the ignition switch position.
Extended cab (club cab and quad cab) models
equipped with the power seat option also feature a
power operated lumbar support in the seat back. The
power lumbar support allows the user to inflate or
deflate a bladder located in the lower seat back to
achieve optimum comfort and support in the lower lum-
bar region of the spinal column. The power lumbar sup-
port shares the battery feed circuit of the power seat
system.
The power seat system includes the power seat
adjuster and motors unit, the power lumbar support
bladder and electric pump (extended cab only), the
power seat switch, and the circuit breaker. Followingare general descriptions of the major components in
the power seat system. Refer to the owner's manual
in the vehicle glove box for more information on the
features, use and operation of the power seat system.
OPERATION
The power seat system allows the driver and/or
front passenger seating positions to be adjusted elec-
trically and independently using the separate power
seat switches found on the outboard seat cushion
side shield of each front seat. See the owner's manual
in the vehicle glove box for more information on the
features, use and operation of the power seat system.
DIAGNOSIS & TESTING - POWER SEAT
SYSTEM
Before any testing of the power seat system is
attempted, the battery should be fully-charged and all
wire harness connections and pins cleaned and tightened
to ensure proper continuity and grounds. For circuit
descriptions and diagrams, refer to Wiring Diagrams.
With the dome lamp on, apply the power seat
switch in the direction of the failure. If the dome
lamp dims, the seat may be jamming. Check under
and behind the seat for binding or obstructions. If
the dome lamp does not dim, proceed with testing of
the individual components and circuits.
BR/BEPOWER SEAT SYSTEM 8N - 15

OPERATION
When the power lumbar switch paddle is actuated,
a battery feed and a ground path are applied through
the switch contacts to the power lumbar adjuster
motor. The motor operates to move the lumbar
adjuster through its drive unit in the selected direc-
tion until the switch is released, or until the travel
limit of the adjuster is reached. When the switch is
moved in the opposite direction, the battery feed and
ground path to the motor are reversed through the
switch contacts. This causes the motor to run in the
opposite direction.
The power lumbar switch should not be held
applied in either direction after the adjuster has
reached its travel limit. The power lumbar adjuster
motor contains a self-resetting circuit breaker to pro-
tect it from overload. However, consecutive or fre-
quent resetting of the circuit breaker must not be
allowed to continue, or the motor may be damaged.
REMOVAL
The power lumbar switch is integral with the other
power seat switches. Refer to the appropriate driver
or passenger power front seat switch removal and/or
installation procedure.
LUMBAR MOTOR
DESCRIPTION
The 8-way power seat option includes an electri-
cally operated lumbar support mechanism. The only
visible evidence of this option is the separate power
lumbar switch control paddle that is located on the
outboard seat cushion side shield, next to the other
power seat switch control knobs. The power lumbar
adjuster and motor are concealed beneath the seat
back trim cover and padding, where they are secured
to a molded plastic back panel and to the seat back
frame.
The power lumbar adjuster cannot be repaired, and
is serviced only as a unit with the seat back frame. If
the power lumbar adjuster or the seat back frame
are damaged or faulty, the entire seat back frame
unit must be replaced. Refer toBucket Seat Back
in Body for the seat back frame service procedures.
OPERATION
The power lumbar adjuster mechanism includes a
reversible electric motor that is secured to the
inboard side of the seat back panel and is connected
to a worm-drive gearbox. The motor and gearbox
operate the lumbar adjuster mechanism in the center
of the seat back by extending and retracting a cable
that actuates a lever. The action of this lever com-
presses or relaxes a grid of flexible slats. The morethis grid is compressed, the more the slats bow out-
ward against the center of the seat back padding,
providing additional lumbar support.
DIAGNOSIS & TESTING - POWER LUMBAR
ADJUSTER
Actuate the power lumbar switch to move the
power lumbar adjuster in each direction. The power
lumbar adjuster should move in both directions. It
should be noted that the power lumber adjuster nor-
mally operates very quietly and exhibits little visible
movement. If the power lumbar adjuster fails to oper-
ate in only one direction, move the adjuster a short
distance in the opposite direction and test again to be
certain that the adjuster is not at its travel limit. If
the power lumbar adjuster still fails to operate in
only one direction, refer toPower Lumbar Switch
in the Diagnosis and Testing section of this group. If
the power lumbar adjuster fails to operate in either
direction, perform the following tests. For complete
circuit diagrams, refer toPower Seatin Wiring Dia-
grams.
(1) Check the power seat circuit breaker in the
junction block. If OK, go to Step 2. If not OK, replace
the faulty power seat circuit breaker.
(2) Check for battery voltage at the power seat cir-
cuit breaker in the junction block. If OK, go to Step
3. If not OK, repair the open fused B(+) circuit to the
fuse in the Power Distribution Center as required.
(3) Remove the outboard seat cushion side shield
from the seat. Disconnect the seat wire harness con-
nector from the power lumbar switch connector
receptacle. Check for battery voltage at the fused
B(+) circuit cavity of the power seat wire harness
connector for the power lumbar switch. If OK, go to
Step 4. If not OK, repair the open fused B(+) circuit
to the power seat circuit breaker in the junction
block as required.
(4) Check for continuity between the ground cir-
cuit cavity of the power seat wire harness connector
for the power lumbar switch and a good ground.
There should be continuity. If OK, go to Step 5. If not
OK, repair the open ground circuit to ground as
required.
(5) Test the power lumbar switch. Refer toPower
Lumbar Switchin the Diagnosis and Testing sec-
tion of this group. If the switch tests OK, test the cir-
cuits of the power seat wire harness between the
power lumbar adjuster motor and the power lumbar
switch for shorts or opens. If the circuits check OK,
replace the faulty seat back frame assembly. If the
circuits are not OK, repair the power seat wire har-
ness as required.
8N - 18 POWER SEAT SYSTEMBR/BE
LUMBAR CONTROL SWITCH (Continued)

the motor and drive unit of the power seat recliner
mechanism is secured with two screws to the seat
cushion frame, and is concealed by the outboard seat
cushion side shield.
The power seat recliner cannot be repaired. If the
unit is faulty or damaged, it must be replaced. Refer
toBucket Seat Reclinerin Body for the service
procedure.
OPERATION
The power seat recliner includes a reversible elec-
tric motor that is secured to the lower hinge plate of
the recliner unit. The motor is connected to a gearbox
that moves the upper hinge plate of the power seat
recliner through a screw-type drive unit.
DIAGNOSIS & TESTING - POWER SEAT
RECLINER
Following are tests that will help to diagnose the
hard wired components and circuits of the power seat
system. Actuate the power seat recliner switch to
move the power seat recliner adjuster in each direc-
tion. The power seat recliner adjuster should move in
both directions. If the power seat recliner adjuster
fails to operate in only one direction, move the
adjuster a short distance in the opposite direction
and test again to be certain that the adjuster is not
at its travel limit. If the power seat recliner adjuster
still fails to operate in only one direction, refer to
Power Seat Switchin the Diagnosis and Testing
section of this group. If the power recliner adjuster
fails to operate in either direction, perform the fol-
lowing tests. For complete circuit diagrams, refer to
Power Seatin Wiring Diagrams.
(1) Check the power seat circuit breaker in the
junction block. If OK, go to Step 2. If not OK, replace
the faulty power seat circuit breaker.
(2) Check for battery voltage at the power seat cir-
cuit breaker in the junction block. If OK, go to Step
3. If not OK, repair the open fused B(+) circuit to the
fuse in the Power Distribution Center as required.
(3) Remove the outboard seat cushion side shield
from the seat. Disconnect the seat wire harness con-
nector from the power seat switch connector recepta-
cle. Check for battery voltage at the fused B(+)
circuit cavity of the power seat wire harness connec-
tor for the power seat switch. If OK, go to Step 4. If
not OK, repair the open fused B(+) circuit to the
power seat circuit breaker in the junction block as
required.
(4) Check for continuity between the ground cir-
cuit cavity of the power seat wire harness connector
for the power seat switch and a good ground. There
should be continuity. If OK, go to Step 5. If not OK,
repair the open ground circuit to ground as required.(5) Test the power seat switch. Refer toPower
Seat Switchin the Diagnosis and Testing section of
this group. If the switch tests OK, test the circuits of
the power seat wire harness between the power seat
recliner adjuster motor and the power seat switch for
shorts or opens. If the circuits check OK, replace the
faulty power seat recliner unit. If the circuits are not
OK, repair the power seat wire harness as required.
POWER SEAT TRACK
DESCRIPTION
There are three reversible motors that operate the
power seat adjuster. The motors are connected to
worm-drive gearboxes that move the seat adjuster
through a combination of screw-type drive units.
The front and rear of a seat are operated by differ-
ent motors. They can be raised or lowered indepen-
dently of each other. When the center seat switch is
pushed in the Up or Down direction, both the front
and rear motors operate in unison. On standard cab
models the entire seat is moved up or down, on
extended cab models (club cab and quad cab) the seat
cushion moves independently of the seat back in the
up or down directions. The forward-rearward motor
is operated by pushing the center seat switch in the
Forward or Rearward direction, which moves the
entire seat in the selected direction on all models.
Each motor contains a self-resetting circuit breaker
to protect it from overload. Consecutive or frequent
resetting of the circuit breakers must not be allowed
to continue, or the motors may be damaged. Make
the necessary repairs.
The power seat adjuster and motors cannot be
repaired, and are serviced only as a complete unit. If
any component in this unit is faulty or damaged, the
entire power seat adjuster and motors assembly must
be replaced.
OPERATION
When a power seat switch is actuated, a battery
feed and a ground path are applied through the
switch contacts to the motor(s). The motor(s) and
drive unit(s) operate to move the seat in the selected
direction until the switch is released, or until the
travel limit of the power seat adjuster is reached.
When the switch is moved in the opposite direction,
the battery feed and ground path to the motor(s) are
reversed through the switch contacts. This causes the
motor to run in the opposite direction.
DIAGNOSIS & TESTING - POWER SEAT TRACK
For circuit descriptions and diagrams, refer to Wir-
ing Diagrams.
BR/BEPOWER SEAT SYSTEM 8N - 21
RECLINER MOTOR (Continued)