POWER SEATS
CONTENTS
page page
DESCRIPTION AND OPERATION
INTRODUCTION ......................... 1
DIAGNOSIS AND TESTING
CIRCUIT BREAKER ....................... 1
DIAGNOSTIC PROCEDURE ................. 1
SEAT MOTORS .......................... 1
SEAT SWITCH ........................... 2
VOLTAGE............................... 3
REMOVAL AND INSTALLATION
FRONT SEAT ASSEMBLY .................. 3
POWER FRONT SEAT ADJUSTER ........... 3
POWER SEAT SWITCH .................... 3
DESCRIPTION AND OPERATION
INTRODUCTION
Power seats can be adjusted in 8 different direc-
tions:
• Front riser up and down
• Rear riser up and down
• Forward and backward
• Seat back recliner up and down
Four single armature permanent magnet reversible
motors are coupled through cables to worm gear box
assemblies. They are located in the seat tracks and
upper supports. The two single gear motor assem-
blies attach to the seat tracks provide the various
seat movements.
The electrical circuit is protected by a 20 amp cir-
cuit breaker located in the junction block.
DIAGNOSIS AND TESTING
DIAGNOSTIC PROCEDURE
Before any testing is attempted the battery should
be carefully charged and all connections and termi-
nals cleaned and tightened to insure proper continu-
ity and grounds.
With dome lamp on, apply switch in direction of
failure. If dome lamp dims the seat motor is trying to
work indicating mechanical jamming. If dome lamp
does not dim, then proceed with the following electri-
cal tests.
CIRCUIT BREAKER
Find correct circuit breaker on fuse block. Pull out
slightly but be sure that circuit breaker terminals
still contact terminals in fuse block. Connect ground
wire of voltmeter to a good ground. With probe of
voltmeter positive wire, check both terminals of cir-
cuit breaker for battery voltage. If only one terminal
checks at battery voltage, circuit breaker is defective
and must be replaced. If neither terminal shows bat-
tery voltage, check for open or shorted circuit to cir-
cuit breaker.
SEAT MOTORS
(1) Remove power seat switch from seat.
(2) Disconnect wire harness connector.
(3) Check Pin 5 for battery voltage and Pin 1 for
ground.
(4) To test the seat motors, refer to the (Fig. 1),
and verify proper seat responses. Using two jumper
wires, connect one to a battery supply and the second
to a ground. Connect the other ends to the seat wire
harness connector as described in the Switch Har-
ness Connector Circuit Test table (Fig. 1).
JA POWER SEATS 8R - 1
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