Subaru Legacy IV (2008 year). 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.