DODGE RAM 2001 Service Repair Manual

REMOVAL
(1) Disconnect and isolate the battery negative
cable.
(2) Unplug the wire harness connector from the
automatic day/night mirror (Fig. 2).
(3) Remove the set screw that secures the auto-
matic day/night mirror to the windshield support
button.
(4) Push the automatic day/night mirror upwards
far enough for the mounting bracket to clear the sup-
port button and remove the mirror from the wind-
shield.
INSTALLATION
(1) Install the mirror to the support button.
(2) Tighten the set screw.
(3) Reconnect the harness connector to the mirror.
(4) Reconnect the negative battery cable.
POWER MIRROR SWITCH
DESCRIPTION
Both the right and left power outside mirrors are
controlled by a single multi-function switch unit
located on and mounted to the upper flag area of the
driver side door trim panel.
OPERATION
The switch knob is rotated clockwise (right mirror
control), or counterclockwise (left mirror control) to
select the mirror to be adjusted. The switch knob is
then moved in a joystick fashion to control movement
of the selected mirror up, down, right, or left.
The power mirror switch cannot be repaired and, if
faulty or damaged, it must be replaced. The power
mirror switch knob is available for service replace-
ment.
REMOVAL
(1) Disconnect and isolate the battery negative
cable.
(2) Pull the control knob rearward to remove it
from the power mirror switch stem (Fig. 3).
Fig. 2 AUTOMATIC DAY/NIGHT MIRROR REMOVE
1 - SCREW
2 - WIRE HARNESS CONNECTOR
3 - AUTOMATIC DAY/NIGHT MIRROR
4 - SUPPORT BUTTON
Fig. 3 POWER MIRROR SWITCH REMOVE/INSTALL
1 - DOOR
2 - SWITCH
3 - DOOR TRIM PANEL
4 - KNOB
5 - NUT
8N - 12 POWER MIRRORSBR/BE
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)

(4) Disconnect and isolate the battery negative
cable. Check for continuity between the ground cir-
cuit cavity in the door wire harness half of the power
mirror switch wire harness connector and a good
ground. There should be continuity. If OK, go to Step
5. If not OK, repair the circuit to ground as required.
(5) Check the power mirror switch continuity as
shown in (Fig. 4). If OK, go to Step 6. If not OK,
replace the faulty switch.(6) Unplug the wire harness connector at the inop-
erative power mirror. Use two jumper wires, one con-
nected to a 12-volt battery feed, and the other
connected to a good body ground. See the Power Mir-
ror Test chart for the correct jumper wire connections
to the power mirror half of the power mirror wire
harness connector (Fig. 5). If the power mirror(s) do
not respond as indicated in the chart, replace the
faulty power mirror assembly. If the power mirror(s)
do respond as indicated in the chart, repair the cir-
cuits between the power mirror and the power mirror
switch for a short or open as required.
REMOVAL
For removal procedures (Refer to 23 - BODY/EX-
TERIOR/SIDE VIEW MIRROR - REMOVAL) .
Fig. 4 Power Mirror Switch Continuity
MIRROR SELECTOR KNOB IN9L9POSITION
MOVE LEVER CONTINUITY BETWEEN
UP Pins 3 and 8, 1 and 7, 4 and 7
RIGHT Pins 3 and 7, 2 and 8, 5 and 8
DOWN Pins 3 and 7, 1 and 8, 4 and 8
LEFT Pins 3 and 8, 2 and 7, 5 and 7
MIRROR SELECTOR KNOB IN(R(POSITION
MOVE LEVER CONTINUITY BETWEEN
UP Pins 6 and 8, 1 and 7, 4 and 7
RIGHT Pins 6 and 7, 2 and 8, 4 and 8
DOWN Pins 6 and 7, 1 and 8, 4 and 8
LEFT Pins 6 and 8, 2 and 7, 5 and 7
Fig. 5 Power Mirror Test
Left or Right Mirror
12 Volts Ground MIRROR
MOVEMENT
Pin 3 Pin 1 UP
Pin 1 Pin 3 DOWN
Pin 2 Pin 1 LEFT
Pin 1 Pin 2 RIGHT
8N - 14 POWER MIRRORSBR/BE
SIDEVIEW MIRROR (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

DRIVER POWER SEAT SWITCH
DESCRIPTION
The power seat in standard cab models can be
adjusted in six different ways using the power seat
switches (Fig. 1). The power seat switch for extended
cab models (club cab and quad cab) has an additional
switch knob for adjusting the power lumbar support.
The switch is located on the lower outboard side of the
seat cushion on the seat cushion side shield on all mod-
els. Refer to the owner's manual in the vehicle glove box
for more information on the power seat switch functions
and the seat adjusting procedures.
The individual switches in the power seat switch
module cannot be repaired. If one switch is damaged
or faulty, the entire power seat switch module must
be replaced.
OPERATION
When a power switch control knob or knobs are actu-
ated, a battery feed and a ground path are applied
through the switch contacts to the power seat track or
recliner adjuster motor. The selected adjuster motor
operates to move the seat track or recliner through its
drive unit in the selected direction 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 adjuster motor to run in the opposite direction.
No power seat switch should be held applied in any
direction after the adjuster has reached its travel limit.
The power seat adjuster motors each contain a self-re-
setting circuit breaker to protect them from overload.
However, consecutive or frequent resetting of the circuit
breaker must not be allowed to continue, or the motor
may be damaged.
DIAGNOSIS & TESTING - DRIVER POWER
SEAT SWITCH
For circuit descriptions and diagrams, refer to Wir-
ing Diagrams.
(1)
Disconnect and isolate the battery negative cable.
(2)Remove the power seat switch from the power
seat.
(3)Use an ohmmeter to test the continuity of the
power seat switches in each position. See the Power
Seat Switch Continuity chart (Fig. 2) . If OK, see Power
Seat Adjuster and Motors or Power Lumbar Adjuster
and Motor in the Diagnosis and Testing section of this
group. If not OK, replace the faulty power seat switch
unit.
DRIVER POWER SEAT SWITCH TEST TABLE
DRIVER SWITCH
POSITIONCONTINUITY BETWEEN
OFF B-N, B-J, B-M
B-E, B-L, B-K
VERTICAL UP A-E, A-M, B-N, B-E
VERTICAL DOWN A-J, A-N, B-M, B-E
HORIZONTAL
FORWARDA-L, B-K
HORIZONTAL
REARWARDA-K, B-L
FRONT TILT UP A-M, B-N
FRONT TILT DOWN A-N, B-M
REAR TILT UP A-E, B-J
REAR TILT DOWN A-J, B-E
LUMBAR OFF O-P, O-R, P-R
LUMPAR UP (INFLATE) O-P, Q-R
LUMBAR DOWN
(DEFLATE)O-R, P-Q
Fig. 1 Seat Switches and Bezel - Standard Cab
1 - Seat Switch
Fig. 2 Testing Driver Power Seat Switch
8N - 16 POWER SEAT SYSTEMBR/BE

REMOVAL
(1) Disconnect and isolate the battery negative
cable.
(2) If equipped with a 6-way power seat, remove
the two screws that secure the power seat switch and
bezel unit to the seat cushion frame (Fig. 3).
(3) If equipped with a 8-way power seat, remove
the seat cushion side shield from the seat. Refer to
Body for the procedure.
(4) Pull the switch bezel or side shield unit out
from the seat far enough to access the switch wire
harness connector. Gently pry the locking tabs of the
switch away from the wire harness connector and
carefully unplug the connector from the power seat
switch module (Fig. 4).
(5) Remove the screws that secure the power seat
switch (Fig. 5).
INSTALLATION
(1) Position the power seat switch on the seat
cushion side shield and connect the electrical connec-
tor.
(2) Install the screws that secure the power seat
switch to seat cushion side shield.
(3) Install the seat cushion side shield on the seat.
Refer to Body for the procedure.
(4) If equipped, install the recliner lever on the
recliner mechanism release shaft.
(5) If equipped, install the screw that secures the
recliner lever to the recliner mechanism release shaft
on the outboard side of the front seat.
(6) Connect the battery negative cable.
LUMBAR CONTROL SWITCH
DESCRIPTION
The 8-way power seat option includes an electri-
cally operated lumbar support mechanism. A single
two-way momentary power lumbar switch is integral
with the power seat switches. The power lumbar
switch is secured to the back of the seat cushion side
shield with screws, and the switch paddle protrudes
through a hole to the outside of the shield. The
switch paddle is located in a shallow depression
molded into the outer surface of the seat cushion side
shield that helps to shroud it from unintentional
actuation when entering or leaving the vehicle.
The power lumbar switches cannot be adjusted or
repaired and, if faulty or damaged, the seat switch
assembly must be replaced.
Fig. 3 Seat Switches and Bezel - Standard Cab
1 - Seat Switch
Fig. 4 Power Seat Switch Connector Remove -
Standard Cab
1 - Release Tabs (3)
Fig. 5 Power Seat Switch Remove/Install - Extended
Cab
1 - Seat Cushion Side Shield
2 - Power Seat Switch
3 - Retaining Screws
BR/BEPOWER SEAT SYSTEM 8N - 17
DRIVER POWER SEAT SWITCH (Continued)

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)

PASSENGER POWER SEAT
SWITCH
DESCRIPTION
The power seat in standard cab models can be
adjusted in six different ways using the power seat
switches (Fig. 6). The power seat switch for extended
cab models (club cab and quad cab) has an additional
switch knob for adjusting the power lumbar support.
The switch is located on the lower outboard side of
the seat cushion on the seat cushion side shield on
all models. Refer to the owner's manual in the vehi-
cle glove box for more information on the power seat
switch functions and the seat adjusting procedures.
The individual switches in the power seat switch mod-
ule cannot be repaired. If one switch is damaged or
faulty, the entire power seat switch module must be
replaced.
OPERATION
When a power switch control knob or knobs are actu-
ated, a battery feed and a ground path are applied
through the switch contacts to the power seat track or
recliner adjuster motor. The selected adjuster motor
operates to move the seat track or recliner through its
drive unit in the selected direction until the switch is
released, or until the travel limit of the adjuster is
reached. When the switch is moved in the opposite direc-
tion, the battery feed and ground path to the motor are
reversed through the switch contacts. This causes the
adjuster motor to run in the opposite direction.
No power seat switch should be held applied in any
direction after the adjuster has reached its travel
limit. The power seat adjuster motors each contain a
self-resetting circuit breaker to protect them from
overload. However, consecutive or frequent resettingof the circuit breaker must not be allowed to con-
tinue, or the motor may be damaged.
DIAGNOSIS & TESTING - PASSENGER POWER
SEAT SWITCH
For circuit descriptions and diagrams, refer to Wir-
ing Diagrams.
(1)
Disconnect and isolate the battery negative cable.
(2)Remove the power seat switch from the power
seat.
(3) Use an ohmmeter to test the continuity of the
power seat switches in each position. See the Power
Seat Switch Continuity chart below (Fig. 7) . If OK,
see Power Seat Adjuster and Motors or Power Lum-
bar Adjuster and Motor in the Diagnosis and Testing
section of this group. If not OK, replace the faulty
power seat switch unit.
PASSENGER POWER SEAT SWITCH TEST TABLE
PASSENGER SWITCH
POSITIONCONTINUITY BETWEEN
OFF B-N, B-J, B-M,B-E, B-L,
B-K
VERTICAL DOWN A-E, A-M, B-N, B-E
VERTICAL UP A-J, A-N, B-M, B-E
HORIZONTAL
FORWARDA-L, B-K
HORIZONTAL
REARWARDA-K, B-L
FRONT TILT DOWN A-M, B-N
FRONT TILT UP A-N, B-M
REAR TILT DOWN A-E, B-J
REAR TILT UP A-J, B-E
LUMBAR OFF O-P, O-R, P-R
LUMBAR DOWN
(DEFLATE)O-P, Q-R
LUMBAR UP (INFLATE) O-R, P-Q
Fig. 6 Seat Switches and Bezel - Standard Cab
1 - Seat Switch
Fig. 7 Testing Passenger Power Seat Switch
BR/BEPOWER SEAT SYSTEM 8N - 19

REMOVAL
(1) Disconnect and isolate the battery negative
cable.
(2) If equipped with a 6-way power seat, remove
the two screws that secure the power seat switch and
bezel unit to the seat cushion frame (Fig. 8).
(3) If equipped with a 8-way power seat, remove
the seat cushion side shield from the seat. Refer to
Body for the procedure.
(4) Pull the switch bezel or side shield unit out
from the seat far enough to access the switch wire
harness connector. Gently pry the locking tabs of the
switch away from the wire harness connector and
carefully unplug the connector from the power seat
switch module (Fig. 9).
(5) Remove the screws that secure the power seat
switch (Fig. 10).
INSTALLATION
(1) Position the power seat switch on the seat
cushion side shield and connect the electrical connec-
tor.
(2) Install the screws that secure the power seat
switch to seat cushion side shield.
(3) Install the seat cushion side shield on the seat.
Refer to Body for the procedure.
(4) If equipped, install the recliner lever on the
recliner mechanism release shaft.
(5) If equipped, install the screw that secures the
recliner lever to the recliner mechanism release shaft
on the outboard side of the front seat.
(6) Connect the battery negative cable.
RECLINER MOTOR
DESCRIPTION
The 8-way power seat option includes an electri-
cally operated seat back recliner mechanism. The
only visible evidence of this option is the power seat
recliner switch control knob that is located on the
outboard seat cushion side shield, just behind the
other power seat switch control knob. The power seat
recliner switch is integral to the 8-way power seat
switch.
The power seat recliner unit is mounted in the
place of a seat hinge on the outboard side of the seat.
The upper hinge plate of the power seat recliner
mechanism is secured with two screws to the seat
back frame and is concealed beneath the seat back
trim cover and padding. The lower hinge plate and
Fig. 8 Seat Switches and Bezel - Standard Cab
1 - Seat Switch
Fig. 9 Power Seat Switch Connector Remove -
Standard Cab
1 - Release Tabs (3)
Fig. 10 Power Seat Switch Remove/Install -
Extended Cab
1 - Seat Cushion Side Shield
2 - Power Seat Switch
3 - Retaining Screws
8N - 20 POWER SEAT SYSTEMBR/BE
PASSENGER POWER SEAT 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)