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POWER SEATS
8R - 1
POWER SEATS
CONTENTS
page
page
DIAGNOSIS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
GENERAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
GENERAL
The power seat can be adjusted in 6 different direc-
tions (Fig. 1). The control switch is on the lower out-
board side of the seat.
The front lever on the switch raises or lowers (tilts)
the front of the seat cushion. The center lever raises
or lowers the complete seat by moving the switch up
or down. The center lever also moves the seat for-
ward or rearward by moving the switch forward or
rearward. The rear lever raises or lowers (tilts) the
back of the seat cushion.
POWER SEAT MOTOR REPLACEMENT . . . . . . . 2
SWITCH TESTING . . . . . . . . . . . . . . . . . . . . . . . 2
ward-rearward motor. The motor is grounded
through pin S4 and the contacts of the back switch to
pin 2 and to ground. The motor runs to drive the seat
forward until the switch is released.
With the switch in the REAR position, pin S4 re-
ceives battery voltage and pin S3 is grounded. This
reversed polarity causes the motor to run in the op-
posite direction and drive the seat backward.
The front motor works in a similar way when the
front height switch is operated.
To raise the entire seat, the center position seat
switch is held in the UP position. This applies bat-
tery voltage to both pins S1 and S5 and the front and
rear motors. Pins S2 and S6 are grounded through
the down switches and the lower switch. Both motors
run to drive the entire seat up. A similar action oc-
curs to move the entire seat down.
Each motor contains a self-resetting circuit breaker
to protect it from overload. Consecutive or frequent
resetting must not be allowed to continue. Make nec-
essary repairs.
DIAGNOSIS
Refer to Group 8W-Wiring Diagrams for a complete
circuit diagram.
Before any testing is attempted the battery should
be fully charged and all connections and pins cleaned
and tightened to insure proper continuity and
grounds.
With the dome light on, apply switch in direction
of the failure. If the dome light dims, the seat may
be jamming. Check for binding. If the dome light
does not dim, then proceed with the following electri-
cal tests.
Fig. 1 Power Seat Switch
There are 3 reversible motors that operate the
power seat. The front and rear of the seat are oper-
ated by different motors. They can be raised or low-
ered independently of each other. Moving the center
position seat switch to either the UP or DOWN posi-
tion, runs both the front and rear motors at the same
time.
The forward-rearward motor is operated by the
center position seat switch. When the switch is held
in the FORWARD position, battery voltage is applied
through the switch contacts to pin S3 and the for-
SEAT MOTOR ASSEMBLY
•
Position seat switch to move all 3 seat motors. The
seat should move in all directions. If not, go to No
Seat Motors Operate. If one or more motors operate,
refer to switch testing.
Test seat switch. If OK, replace defective motor.
NO SEAT MOTORS OPERATE
Circuit breaker installed.
•
Probe 30 amp circuit breaker, cavity #16 on fuse
panel. If battery voltage is present, replace circuit
breaker.
8R - 2
POWER SEATS
J
•
Remove switch mounting screws and measure volt-
age at red wire at switch. Meter should read battery
voltage. If not, repair open to circuit breaker.
•
Measure resistance at black wire at switch. Meter
should read zero ohms. If OK, replace switch. If not,
repair open to ground.
SWITCH TESTING
POWER SEAT MOTOR REPLACEMENT
(1) Disconnect power seat wire harness at motor.
(2) Remove bolts attaching seat frame to floor pan
and remove seat.
(3) Disconnect motor ground wire.
CAUTION: Take care to avoid excessive bending of
the 3 drive cables when removing/installing the mo-
tor assembly.
(4) Remove screws attaching motor assembly to
seat frame and remove motor assembly and mount-
ing spacers (Fig. 3).
Fig. 3 Power Seat Motor Assembly
(5) To install power seat motor, reverse the re-
moval procedures.
DRIVER SIDE
Fig. 2 Switch Diagram

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