Subaru Legacy IV (2008 year). Service manual — part 1105

SE-32

Power Seat System

SEATS

8. SOME OF THE MOTORS DO NOT OPERATE (DRIVER’S SEAT, WITH MEMORY)

• Malfunction of slide operation

Step

Check

Yes

No

1

CHECK OPERATION.
Check the slide motor rotation while moving the
switch to slide forward and slide backward.

Does the motor rotate for one
second or more when operating
the switch?

Go to step 2.

Encoder defec-
tion. Replace the
slide rail assembly.

2

CHECK SWITCH.
1) Disconnect the harness 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 3.

Replace the power
seat switch assem-
bly.

3

CHECK HARNESS.
1) Disconnect the power seat switch connector
and slide motor connector.
2) Measure the resistance between the mem-
ory module connector and power seat switch
connector.

Connector & terminal

(R195) No. 7 — (R190) No. 13:
(R195) No. 6 — (R190) No. 14:

Is the resistance less than 10

:? Go to step 4.

Check power seat
harness.

4

CHECK HARNESS.
1) Disconnect the slide motor connector.
2) Measure the resistance between the mem-
ory module connector and slide motor connec-
tor.

Connector & terminal

(R196) No. 16 — (R206) No. 1:
(R196) No. 15 — (R206) No. 2:

Is the resistance less than 10

:? Go to step 5.

Check power seat
harness.

5

CHECK SLIDE MOTOR.
Apply battery voltage to the memory module
connector and check the motor rotation.

Connector & terminal

(R196) No. 16 (+) — (R196) No. 15 (–):
(R196) No. 15 (+) — (R196) No. 16 (–):

Does the motor rotate nor-
mally?

Replace the mem-
ory module.

Slide motor prob-
lem. Replace the
slide rail assembly.

SE-33

Power Seat System

SEATS

• Malfunction of tilt operation

Step

Check

Yes

No

1

CHECK OPERATION.
Check the tilt motor rotation while moving the
switch to tilt up and tilt down.

Does the motor rotate for one
second or more when operating
the switch?

Go to step 2.

Encoder defec-
tion. Replace the
slide rail assembly.

2

CHECK SWITCH.
1) Disconnect the harness 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 3.

Replace the power
seat switch assem-
bly.

3

CHECK HARNESS.
1) Disconnect the power seat switch connector
and tilt motor connector.
2) Measure the resistance between the mem-
ory module connector and power seat switch
connector.

Connector & terminal

(R195) No. 3 — (R190) No. 5:
(R195) No. 2 — (R190) No. 6:

Is the resistance less than 10

:? Go to step 4.

Check power seat
harness.

4

CHECK HARNESS.
1) Disconnect the tilt motor connector.
2) Measure the resistance between the mem-
ory module connector and tilt motor connector.

Connector & terminal

(R196) No. 4 — (R197) No. 3:
(R196) No. 5 — (R197) No. 2:

Is the resistance less than 10

:? Go to step 5.

Check power seat
harness.

5

CHECK TILT MOTOR.
Apply battery voltage to the memory module
connector and check the motor rotation.

Connector & terminal

(R196) No. 4 (+) — (R196) No. 5 (–):
(R196) No. 5 (+) — (R196) No. 4 (–):

Does the motor rotate nor-
mally?

Replace the mem-
ory module.

Tilt motor problem.
Replace the slide
rail assembly.

SE-34

Power Seat System

SEATS

• Malfunction of lifter operation

Step

Check

Yes

No

1

CHECK OPERATION.
Check the lifter motor rotation while turning the
switch to lifter up and lifter down.

Does the motor rotate for one
second or more when operating
the switch?

Go to step 2.

Encoder defec-
tion. Replace the
slide rail assembly.

2

CHECK SWITCH.
1) Disconnect the harness 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 3.

Replace the power
seat switch assem-
bly.

3

CHECK HARNESS.
1) Disconnect the power seat switch connector
and lifter motor connector.
2) Measure the resistance between the mem-
ory module connector and power seat switch
connector.

Connector & terminal

(R195) No. 5 — (R190) No. 2:
(R195) No. 4 — (R190) No. 1:

Is the resistance less than 10

:? Go to step 4.

Check power seat
harness.

4

CHECK HARNESS.
1) Disconnect the lifter motor connector.
2) Measure the resistance between the mem-
ory module connector and lifter motor connec-
tor.

Connector & terminal

(R196) No. 1 — (R194) No. 4:
(R196) No. 2 — (R194) No. 3:

Is the resistance less than 10

:? Go to step 5.

Check power seat
harness.

5

CHECK LIFTER MOTOR.
Apply battery voltage to the memory module
connector and check the motor rotation.

Connector & terminal

(R196) No. 1 (+) — (R196) No. 2 (–):
(R196) No. 2 (+) — (R196) No. 1 (–):

Does the motor rotate nor-
mally?

Replace the mem-
ory module.

Lifter motor prob-
lem. Replace the
slide rail assembly.

SE-35

Power Seat System

SEATS

• Malfunction of reclining operation

Step

Check

Yes

No

1

CHECK OPERATION.
Check the reclining motor rotation while moving
the switch to reclining forward and reclining
backward.

Does the motor rotate for one
second or more when operating
the switch?

Go to step 2.

Encoder defec-
tion. Replace the
reclining motor
assembly.

2

CHECK SWITCH.
1) Disconnect the harness 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 3.

Replace the power
seat switch assem-
bly.

3

CHECK HARNESS.
1) Disconnect the power seat switch connector
and reclining motor connector.
2) Measure the resistance between the mem-
ory module connector and power seat switch
connector.

Connector & terminal

(R195) No. 9 — (R190) No. 4:
(R195) No. 8 — (R190) No. 3:

Is the resistance less than 10

:? Go to step 4.

Check power seat
harness.

4

CHECK HARNESS.
1) Disconnect the slide motor connector.
2) Measure the resistance between the mem-
ory module connector and reclining motor con-
nector.

Connector & terminal

(R196) No. 6 — (R191) No. 1:
(R196) No. 7 — (R191) No. 2:

Is the resistance less than 10

:? Go to step 5.

Check power seat
harness.

5

CHECK RECLINING MOTOR.
Apply battery voltage to the memory module
connector and check the motor rotation.

Connector & terminal

(R196) No. 6 (+) — (R196) No. 7 (–):
(R196) No. 7 (+) — (R196) No. 6 (–):

Does the motor rotate nor-
mally?

Replace the mem-
ory module.

Reclining motor
problem. Replace
the reclining motor
assembly.