Subaru Legacy IV (2008 year). Service manual — part 1104
SE-28
Power Seat System
SEATS
• Passenger’s seat
4. CHECK MEMORY SWITCH
(MEMORY-EQUIPPED)
Move each switch and measure the resistance be-
tween connector terminals.
5. ALL FUNCTION FAILS TO OPERATE (DRIVER’S SEAT, WITHOUT MEMORY)
Switch position
Terminal No.
Standard
Slide forward
7 and 13
8 and 14
Less than 10
:
Slide backward
7 and 14
8 and 13
Less than 10
:
Reclining forward
7 and 4
8 and 3
Less than 10
:
Reclining backward
7 and 3
8 and 4
Less than 10
:
5 4
3
8 7
6
2 1
11
9
10
12
14 13
SE-00682
Switch position
Terminal No.
Standard
Memory 1
3 and 1
Less than 10
:
Memory 2
2 and 1
Less than 10
:
Set
8 and 1
Less than 10
:
5 4 3
8 7 6
2 1
SE-00683
Step
Check
Yes
No
1
CHECK SEAT FUNCTION.
Operate each power seat switch and check that
each power seat function operates normally.
Does all function fails to oper-
ate?
Go to step 2.
Check motors that
do not operate.
<Ref. to SE-29,
SOME OF THE
MOTORS DO NOT
OPERATE
(DRIVER’S SEAT,
WITHOUT MEM-
ORY), INSPEC-
TION, Power Seat
System.>
2
CHECK FUSE.
Check the power seat fuse inside the fuse box.
Is the fuse blown out?
Replace the appro-
priate fuse.
Go to step 3.
3
CHECK POWER SUPPLY CIRCUIT.
1) Disconnect the connector of power seat
switch assembly.
2) Measure the voltage between harness con-
nector and chassis ground.
Connector & terminal
(R190) No. 7 (+) — Chassis ground (–):
Is the voltage 10 V or more?
Go to step 4.
Check body har-
ness.
4
CHECK POWER SUPPLY CIRCUIT.
Measure the resistance between power seat
switch harness connector and chassis ground.
Connector & terminal
(R190) No. 8 — Chassis ground:
Is the resistance less than 10
:? Replace the power
seat switch assem-
bly.
Check body har-
ness.
SE-29
Power Seat System
SEATS
6. SOME OF THE MOTORS DO NOT OPERATE (DRIVER’S SEAT, WITHOUT MEMORY)
• Malfunction of slide operation
• Malfunction of tilt operation
Step
Check
Yes
No
1
CHECK SWITCH.
1) Disconnect the connector of power seat
switch assembly.
2) Measure resistance between terminals
while moving the switch to slide forward and
slide rearward positions. <Ref. to SE-27,
CHECK POWER SEAT SWITCH, INSPEC-
TION, Power Seat System.>
Is there any problem on the
inspection result?
Go to step 2.
Replace the power
seat switch assem-
bly.
2
CHECK HARNESS.
1) Disconnect the power seat switch connector
and slide motor connector.
2) Measure the resistance between power
seat switch connector and slide motor connec-
tor.
Connector & terminal
(R192) No. 1 — (R190) No. 14:
(R192) No. 2 — (R190) No. 13:
Is the resistance less than 10
:? Go to step 3.
Check power seat
harness.
3
CHECK SLIDE MOTOR.
1) Connect the power seat switch connector
and slide motor connector.
2) Apply 12 V voltage to the slide motor and
check the motor rotation.
Connector & terminal
(R190) No. 14 (+) — (R190) No. 13 (–):
(R190) No. 13 (+) — (R190) No. 14 (–):
Does the motor rotate nor-
mally?
Check for tempo-
rary poor contact
or mechanical
trouble in slide rail.
Slide motor prob-
lem. Replace the
slide rail assembly.
Step
Check
Yes
No
1
CHECK SWITCH.
1) Disconnect the connector of power seat
switch assembly.
2) Measure resistance between terminals
while moving the switch to tilt up and tilt down
positions. <Ref. to SE-27, CHECK POWER
SEAT SWITCH, INSPECTION, Power Seat
System.>
Is there any problem on the
inspection result?
Go to step 2.
Replace the power
seat switch assem-
bly.
2
CHECK HARNESS.
1) Disconnect the power seat switch connector
and tilt motor connector.
2) Measure the resistance between power
seat switch connector and tilt motor connector.
Connector & terminal
(R197) No. 2 — (R190) No. 2:
(R197) No. 3 — (R190) No. 1:
Is the resistance less than 10
:? Go to step 3.
Check power seat
harness.
3
CHECK TILT MOTOR.
1) Connect the power seat switch connector
and tilt motor connector.
2) Apply 12 V voltage to the tilt motor and
check the motor rotation.
Connector & terminal
(R190) No. 2 (+) — (R190) No. 1 (–):
(R190) No. 1 (+) — (R190) No. 2 (–):
Does the motor rotate nor-
mally?
Check for tempo-
rary poor contact
or mechanical
trouble in tilt mech-
anism.
Tilt motor problem.
Replace the slide
rail assembly.
SE-30
Power Seat System
SEATS
• Malfunction of lifter operation
• Malfunction of reclining operation
Step
Check
Yes
No
1
CHECK SWITCH.
1) Disconnect the connector of power seat
switch assembly.
2) Measure resistance between terminals
while moving the switch to lifter up and lifter
down positions. <Ref. to SE-27, CHECK
POWER SEAT SWITCH, INSPECTION, Power
Seat System.>
Is there any problem on the
inspection result?
Go to step 2.
Replace the power
seat switch assem-
bly.
2
CHECK HARNESS.
1) Disconnect the power seat switch connector
and lifter motor connector.
2) Measure the resistance between power
seat switch connector and lifter motor connec-
tor.
Connector & terminal
(R194) No. 4 — (R190) No. 5:
(R194) No. 3 — (R190) No. 6:
Is the resistance less than 10
:? Go to step 3.
Check power seat
harness.
3
CHECK LIFTER MOTOR.
1) Connect the power seat switch connector
and lifter motor connector.
2) Apply 12 V voltage to the lifter motor and
check the motor rotation.
Connector & terminal
(R190) No. 5 (+) — (R190) No. 6 (–):
(R190) No. 6 (+) — (R190) No. 5 (–):
Does the motor rotate nor-
mally?
Check for tempo-
rary poor contact
or mechanical
trouble in lifter
mechanism.
Lifter motor prob-
lem. Replace the
slide rail assembly.
Step
Check
Yes
No
1
CHECK SWITCH.
1) Disconnect the connector of power seat
switch assembly.
2) Measure resistance between terminals
while moving the switch to reclining forward and
reclining rearward positions. <Ref. to SE-27,
CHECK POWER SEAT SWITCH, INSPEC-
TION, Power Seat System.>
Is there any problem on the
inspection result?
Go to step 2.
Replace the power
seat switch assem-
bly.
2
CHECK HARNESS.
1) Disconnect the power seat switch connector
and reclining motor connector.
2) Measure the resistance between power
seat switch connector and reclining motor con-
nector.
Connector & terminal
(R191) No. 2 — (R190) No. 3:
(R191) No. 1 — (R190) No. 4:
Is the resistance less than 10
:? Go to step 3.
Check power seat
harness.
3
CHECK RECLINING MOTOR.
1) Connect the power seat switch connector
and reclining motor connector.
2) Apply 12 V voltage to the reclining motor
and check the motor rotation.
Connector & terminal
(R190) No. 3 (+) — (R190) No. 4 (–):
(R190) No. 4 (+) — (R190) No. 3 (–):
Does the motor rotate nor-
mally?
Check for tempo-
rary poor contact
or mechanical
trouble in reclining
hinge.
Reclining motor
problem. Replace
the reclining motor
assembly.
SE-31
Power Seat System
SEATS
7. DOES NOT OPERATE IN MANUAL OPERATION (DRIVER’S SEAT, MEMORY-EQUIPPED)
Step
Check
Yes
No
1
CHECK SEAT FUNCTION.
Operate each power seat switch and check that
each power seat function operates normally.
Does all function fails to oper-
ate?
Go to step 2.
Check the motor
which does not
operate. <Ref. to
SE-32, SOME OF
THE MOTORS DO
NOT OPERATE.
(DRIVER’S SEAT,
WITH MEMORY),
INSPECTION,
Power Seat Sys-
tem.>
2
CHECK FUSE.
Check the power seat fuse inside the fuse box.
Is the fuse blown out?
Replace the appro-
priate fuse.
Go to step 3.
3
CHECK POWER SUPPLY CIRCUIT.
1) Disconnect the memory module connector.
2) Measure the voltage between harness con-
nector and chassis ground.
Connector & terminal
(R195) No. 10 (+) — Chassis ground (–):
(R196) No. 8 (+) — Chassis ground (–):
(R196) No. 3 (+) — Chassis ground (–):
Is the voltage 10 V or more?
Go to step 4.
Check body har-
ness.
4
CHECK POWER SUPPLY CIRCUIT.
Measure the resistance between memory mod-
ule harness connector and chassis ground.
Connector & terminal
(R196) No. 14 — Chassis ground:
(R196) No. 12 — Chassis ground:
Is the resistance less than 10
:? Go to step 5.
Check body har-
ness.
5
CHECK IGNITION CIRCUIT.
Measure the voltage between harness connec-
tor and chassis ground while turning the ignition
switch to ON.
Connector & terminal
(R195) No. 11 (+) — Chassis ground (–):
Is the voltage 10 V or more?
Go to step 6.
Check body har-
ness.
6
CHECK TRANSMISSION CIRCUITS.
Measure the resistance between harness con-
nector and chassis ground in the following con-
dition.
• AT model: Select lever shifted to P position.
• MT model: Parking brake lever pulled.
Connector & terminal
(R195) No. 12 — Chassis ground:
Is the resistance less than 10
:? Go to step 7.
Check body har-
ness.
7
CHECK SWITCH.
1) Disconnect the connector of power seat
switch assembly.
2) Measure resistance between terminals
while moving the switch to reclining forward and
reclining rearward positions. <Ref. to SE-27,
CHECK POWER SEAT SWITCH, INSPEC-
TION, Power Seat System.>
Is there any problem on the
inspection result?
Replace the mem-
ory module.
Replace the power
seat switch assem-
bly.
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