Subaru Legacy IV (2008 year). Service manual — part 991
AC(diag)-16
Diagnostics for A/C System Malfunction
HVAC SYSTEM (AUTO A/C) (DIAGNOSTICS)
B: BLOWER MOTOR DOES NOT ROTATE
TROUBLE SYMPTOM:
• Blower motor does not rotate.
• Blower motor does not rotate in “HI”.
WIRING DIAGRAM:
11
12
32
B225
B87
B86
F/B No. 27
F/B No. 28
F/B No. 22
SBF-3
MAIN SBF
SBF-6
2
4
1
21
23
24
22
2
1
B87
B86
3 4
1 2
B282
E
M
3
1 2
B225
AC-01644
B282
13
14
15 16
17
27
24
25
26
20
21
22
23
29
30
31
28
32
35
33
34
37
38
39
36
40
8
9
10
11 12
1
2
5
3
4
7
6
19
18
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40
BATTERY
IGNITION
SWITCH
BLOWER MOTOR
RELAY
BLOWER MOTOR
POWER
TRANSISTOR
AUTO A/C CONTROL MODULE
AC(diag)-17
Diagnostics for A/C System Malfunction
HVAC SYSTEM (AUTO A/C) (DIAGNOSTICS)
Step
Check
Yes
No
1
CHECK FUSE.
1) Remove fuse No. 22, 27 and 28 from fuse &
relay box.
2) Check the condition of fuse.
Is any fuse blown out?
Replace the fuse.
Go to step 2.
2
CHECK POWER SUPPLY FOR BLOWER
MOTOR.
1) Turn the ignition switch to ON.
2) Turn the blower switch to ON.
3) Measure the voltage between blower motor
and chassis ground.
Connector & terminal
(B87) No. 2 (+) — Chassis ground (–):
Is the voltage 10 V or more?
Go to step 3.
Repair the open
circuit of blower
motor power sup-
ply line harness.
3
CHECK BLOWER MOTOR RELAY.
1) Turn the ignition switch to OFF.
2) Remove the blower motor relay.
3) Connect the battery positive (+) terminal to
terminal No. 23 of blower motor relay, and neg-
ative (–) terminal to terminal No. 24.
4) Measure the resistance between terminals
No. 21 and No. 22.
Terminals
(B225) No. 21 — (B225) No. 22:
Is the resistance less than 1
:? Go to step 4.
Replace the blower
motor relay.
4
CHECK BLOWER MOTOR.
1) Disconnect the connector from blower
motor.
2) Connect the battery positive (+) terminal to
terminal No. 2 of blower motor connector, and
negative (–) terminal to terminal No. 1.
3) Make sure the blower motor runs.
Does the blower motor run?
Go to step 5.
Replace the blower
motor.
5
CHECK POOR CONTACT.
Check poor contact of auto A/C control module
connector.
Is there poor contact in connec-
tor?
Repair the connec-
tor.
Replace the auto
A/C control mod-
ule.
AC(diag)-18
Diagnostics for A/C System Malfunction
HVAC SYSTEM (AUTO A/C) (DIAGNOSTICS)
C: COMPARTMENT TEMPERATURE DOES NOT CHANGE, OR A/C SYSTEM
DOES NOT RESPOND PROMPTLY
WIRING DIAGRAM:
E
E
E
MAIN SBF
SBF-6
F/B No.22
B360
F109
B143
B:
F37
A:
F35
C:
B143
B:
F37
A:
F35
C:
1
9
F24
1
2
B361
F108
B136
C:
B282
F27
B10
14
9
14
16
15
17
C3
C7
A4
B13
2
4
1
3
C9
C24
C33
22
15
A13
B20
C12
A/C RELAY
B282
B143
F109
B:
F37
A:
F35
C:
1 2 3 4
5 6 7 8 9
10 11 12 13 14
15 16 17 18 19 20
1 2
3 4 5
6 7 8 9 10 11 12
2 3 4
5 6 7 8 9
11 12 13 14
17 18 19 20
1
10
15 16
B361
1 2 3
4 5 6
7 8 9 10 11 12 13 14
B136
C:
1
2
8 9
5
6
3
4
10 11 12
19 20 21
29 30
31
13 14 15 16
17
27
28
18
22 23 24 25 26
7
32 33 34 35
F24
1 2
B10
2
3
1
4
B360
1 2 3
4 5 6 7
8 9 10 11 12 13 14 15 16
F108
1
9
2 3
8
10
4
11 12 13 14 15 16
5 6 7
17 18
1 2 3 4 5 6 7 8 9 10
21 22 23 24 25 26 27 28 29 30
11 12 13 14 15 16 17 18 19 20
31 32 33 34 35 36 37 38 39 40
F27
12
11
10
18
19
16
15
17
9
20 21 22
8
4 5
3
2
1
7
6
14
13
3 4
1 2
8 9 10 11
12 13 14 15 16 17 18 19 20 21 22 23 24
5
6 7
AC-01683
IGNITION SWITCH
THROUGH JOINT
CONNECTOR
THROUGH JOINT
CONNECTOR
MAIN FUSE
BOX
PRESSURE
SWITCH
MAGNET
CLUTCH
MAIN FUSE
BOX
AUTO A/C
CONTROL
MODULE
ECM
BATTERY
AC(diag)-19
Diagnostics for A/C System Malfunction
HVAC SYSTEM (AUTO A/C) (DIAGNOSTICS)
Step
Check
Yes
No
1
CHECK FUSE.
1) Turn the ignition switch to OFF.
2) Remove the fuse No. 22 from fuse & relay
box.
3) Check the condition of fuse.
Is the fuse blown out?
Replace the fuse.
Go to step 2.
2
CHECK POWER SUPPLY TO A/C RELAY
AND AUTO A/C CONTROL MODULE.
1) Disconnect the A/C relay and auto A/C con-
trol module harness connector.
2) Turn the ignition switch to ON.
3) Measure the voltage between A/C relay
connector terminal and chassis ground.
4) Measure the voltage between auto A/C con-
trol module harness connector terminal and
chassis ground.
Connector & terminal
(F27) No. 17 (+) — Chassis ground (–):
(B282) No. 22 (+) — Chassis ground (–):
Is the voltage 10 V or more?
Go to step 5.
Go to step 3.
3
CHECK POWER SUPPLY FOR PRESSURE
SWITCH.
1) Turn the ignition switch to OFF.
2) Disconnect the pressure switch harness
connector.
3) Turn the ignition switch to ON.
4) Measure the voltage between pressure
switch harness connector terminal and chassis
ground.
Connector & terminal
(B10) No. 2 (+) — Chassis ground (–):
Is the voltage 10 V or more?
Go to step 4.
Check for open or
short circuit in the
harness between
fuse and pressure
switch.
4
CHECK HARNESS BETWEEN PRESSURE
SWITCH AND A/C RELAY, AUTO A/C CON-
TROL MODULE.
1) Turn the ignition switch to OFF.
2) Measure the resistance of harness between
pressure switch connector and A/C relay con-
nector.
3) Measure the resistance of harness between
pressure switch connector and auto A/C control
module connector.
Connector & terminal
(B10) No. 1 — (F27) No. 17:
(B10) No. 1 — (B282) No. 22:
Is the resistance less than 1
:? Check the pres-
sure switch. <Ref.
to AC-42, INSPEC-
TION, Pressure
Switch (Triple
Pressure Switch).>
Repair the har-
ness.
5
CHECK POWER SUPPLY FOR A/C RELAY.
Measure the voltage between A/C relay con-
nector terminal and chassis ground.
Connector & terminal
(F27) No. 14 (+) — Chassis ground (–):
Is the voltage 10 V or more?
Go to step 6.
Check open or
short circuit of har-
ness between fuse
and A/C relay.
6
CHECK A/C RELAY.
Check the A/C relay. <Ref. to AC-41, INSPEC-
TION, Relay and Fuse.>
Is there a malfunction in the A/C
relay?
Replace the A/C
relay.
Go to step 7.
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