2004 SUBARU FORESTER relay

HVAC SYSTEM
(HEATER, VENTILATOR AND A/C)
AC
Page
1. General Description ....................................................................................2
2. Refrigerant Pressure with Manifold Gauge Set .........................................25
3. Refrigerant Recovery Procedure...............................................................26
4. Refrigerant Charging Procedure ...............................................................27
5. Refrigerant Leak Check ............................................................................30
6. Compressor Oil .........................................................................................31
7. Blower Motor Unit Assembly .....................................................................32
8. Blower Resistor (Manual A/C Model) ........................................................33
9. Heater Core...............................................................................................34
10. Control Unit ...............................................................................................35
11. Compressor...............................................................................................36
12. Condenser.................................................................................................37
13. Condenser (Sub Fan)................................................................................38
14. Heater Cooling Unit ...................................................................................39
15. Evaporator.................................................................................................40
16. Hose and Tube..........................................................................................41
17. Relay and Fuse .........................................................................................42
18. Pressure Switch (Triple Pressure Switch) .................................................43
19. Ambient Sensor (Auto A/C Model) ............................................................44
20. Sunload Sensor (Auto A/C Model) ............................................................45
21. Air Vent Grille ............................................................................................46
22. Heater Duct ...............................................................................................47
23. Heater Vent Duct.......................................................................................48
24. Heater Cock Solenoid Valve .....................................................................49
25. General Diagnostics ..................................................................................50

AC-42
HVAC SYSTEM (HEATER, VENTILATOR AND A/C)
Relay and Fuse
17.Relay and Fuse
A: LOCATIONB: INSPECTION
While applying battery voltage between the termi-
nals (1) and (2), check continuity between the ter-
minals (3) and (5).
If no continuity exists, replace the relay with a new
one.
(1) Main fuse box (M/B)
(2) Main fan relay
(3) Sub fan relay
(4) A/C relay
(5) Fan mode relay
(6) Main fan fuse
(7) Sub fan fuse
AC-00834
(7) (6) (5) (4)(1) (3) (2)
(1) — (2) Continuity exists.
(3) — (4) Continuity exists.
(3) — (5) No continuity.
AC-00093
4
4
5
2
25
3
3
1
1

AC-50
HVAC SYSTEM (HEATER, VENTILATOR AND A/C)
General Diagnostics
25.General Diagnostics
A: INSPECTION
Symptom Repair order
Blower motorDoes not run.Fuse
Blower motor relay
Wiring harness
Blower motor
Blower motor resistor (Manual A/C model)
Blower switch
Noise Blower motor
CompressorDoes not run.Refrigerant
Fuse
A/C relay
Wiring harness
Magnet clutch
Compressor
Pressure switch
A/C switch
Blower switch
NoiseV- B e l t
Magnet clutch
Compressor
Condenser fanDoes not run.Fuse
Sub fan relay
Wiring harness
Noise Condenser fan motor
Cold air not emitted.Refrigerant
V- B e l t
Magnet clutch
Compressor
Pressure switch
Blower fan relay, Blower motor
A/C switch
Blower switch
Wiring harness
Heater duct
Heater vent duct
Control unit
Expansion valve
Evaporator
Air mix actuator (Auto A/C), Temperature control cable (Manual
A/C)
Warm air not emitted.Engine coolant
Aspirator hose
Blower switch
Air mix actuator (Auto A/C), Temperature control cable (Manual
A/C)
Heater core
Heater cock solenoid valve (Non-turbo model for EC/EK)

AC-5
HVAC SYSTEM (AUTO A/C)(DIAGNOSTIC)
Electrical Component Location
3. Electrical Component Location
A: LOCATION
1. ENGINE COMPARTMENT
(1) A/C compressor (3) Pressure switch (4) Ambient sensor
(2) A/C relay
AC-00097 (1)
(2)
(4)
(1)
(3)
(2)
(3)

AC-13
HVAC SYSTEM (AUTO A/C)(DIAGNOSTIC)
Diagnostics for A/C System Malfunction
Step Check Yes No
1 CHECK FUSE.
1) Turn the ignition switch to OFF.
2) Remove the fuse No. 2 from main fuse box.
3) Check the condition of fuse.Is the fuse blown-out? Replace the fuse. Go to step 2.
2 CHECK FUSE.
1) Turn the ignition switch to OFF.
2) Remove the fuse No. 17 from fuse & relay
box.
3) Check the condition of fuse.Is the fuse blown-out? Replace the fuse. Go to step 3.
3 CHECK AUTO A/C CONTROL MODULE
POWER CIRCUIT.
1) Pull out the auto A/C control module con-
nector.
2) Measure the voltage between auto A/C
control module connector terminal and chassis
ground after turning the ignition switch to OFF
position.
Connector & terminal
(i49) No. 4 (+) — Chassis ground (
−):Is the voltage more than 10 V? Go to step 4.Check open or
short circuit in har-
ness between auto
A/C control mod-
ule and fuse.
4 CHECK AUTO A/C CONTROL MODULE
POWER CIRCUIT.
Measure the voltage between auto A/C control
module connector terminal and chassis ground
after turning the ignition switch to ON position.
Connector & terminal
(i49) No. 5 (+) — Chassis ground (
−):Is the voltage more than 10 V? Go to step 5.Check open or
short circuit in har-
ness between auto
A/C control mod-
ule and fuse.
5 CHECK AUTO A/C CONTROL MODULE
GROUND CIRCUIT.
Measure the resistance in harness between
auto A/C control module and chassis ground.
Connector & terminal
(i49) No. 11 — Chassis ground:Is the resistance less than 1
Ω?Go to step 6.Repair the har-
ness for ground
line.
6 CHECK POOR CONTACT.
Check poor contact in auto A/C control module
connector.Is there poor contact in con-
nector?Repair the con-
nector.Replace the auto
A/C control mod-
ule.

AC-14
HVAC SYSTEM (AUTO A/C)(DIAGNOSTIC)
Diagnostics for A/C System Malfunction
B: BLOWER FAN DOES NOT ROTATE.
TROUBLE SYMPTOM:
 Blower motor does not rotate.
 Blower motor does not change.
WIRING DIAGRAM:
AC-00150
E
B50
B50B87A:
i48B:
i49 4
312
B87 5
21
SBF-1SBF-3 F/B NO.1
SBF-4
F/B NO.2
F/B NO.17
B16B15
18
B202
B202
i41
22
341212345612345678
910 11 12 13 14 15 1612345678910
11 12 13 14 15 16 17 18 19 20
34 12 8910 11
12 13 14 15 16 17 18 19 20 21 22 23 24567
A: i48B: i49BATTERY
IGNITION
SWITCH
BLOWER
MOTOR RELAY
BLOWER MOTOR
B201
34 12 8910 11
12 13 14 15 16 17 18 19 20 21 22 23 2456 7
3
RHDRHD
LHDLHD
: LHD MODEL
: RHD MODELLHD
RHD
B201i40
AUTO A/C CONTROL MODULE

AC-15
HVAC SYSTEM (AUTO A/C)(DIAGNOSTIC)
Diagnostics for A/C System Malfunction
Step Check Yes No
1 CHECK FUSE.
1) Remove the fuse No. 1, 2 and 17 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 fan speed control dial clockwise.
3) Measure the voltage between blower motor
and chassis ground.
Connector & terminal
(B87) No. 1 (+) — Chassis ground (
−):Is the voltage more than 8 V (at
normal temperature)?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. 1 of blower motor relay, and nega-
tive (−) terminal to terminal No. 3.
4) Measure the resistance between terminals
No. 2 and 4.
Te r m i n a l s
No. 2 — No. 4:Is the resistance less than 1
Ω?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. 1 of blower motor connector, and
negative (−) terminal to terminal No. 2 and No.
5.
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 in auto A/C control module
connector.Is there poor contact in con-
nector?Repair the con-
nector.Replace the auto
A/C control mod-
ule.

AC-16
HVAC SYSTEM (AUTO A/C)(DIAGNOSTIC)
Diagnostics for A/C System Malfunction
C: COMPARTMENT TEMPERATURE DOES NOT CHANGE, OR A/C SYSTEM
DOES NOT RESPOND PROMPTLY.
TROUBLE SYMPTOM:
 Compartment temperature is not changed. (No cool air is discharged.)
 A/C system does not respond quickly.
WIRING DIAGRAM:
 LHD model
AC-00882
A: B134 :
B: B135 :
B202
D: B137 :C: B136 :
F2F27
EA:
i48
F27
F17
F79
F45
B62
B202
i41
F24
F24
F16F79
F45
F17
B:
i49A:
B134 B136
B135 B137C:
B:D:IGNITION
SWITCHBATTERY
A/C RELAY HOLDER
FAN RELAY
FAN RELAY
A/C RELAY
PRESSURE SWITCH
COMPRESSOR
MAGNET
CLUTCH FAN MODE RELAYSUB FAN FUSE
MAIN FAN FUSE
MAIN FAN MOTOR
1
M
SBF-1SBF-4F/B NO.17
F/B NO.18
1
2
3
2
1
4
3033
32 31
34
86
7 9
5
2926
27 28
25
1916
15 18
17
43
21
B15A10B17
F17
MAIN FAN MOTOR
M
F16
SUB FAN MOTOR
M
F16
SUB FAN MOTOR
M
1
2112 1314
15 16171819
20
10
1121222324
2526272829
3031323334
35
36
12
93456
7
82 314
567
82 1
94
310
24 22 23 251112131415
26 27
281617181920 21
4
1
53
2618 15 167891011
17 19
20121314
1234567891011121314151617181920212223242526272829303132333435
AUTO A/C
CONTROL MODULE ECM
2421
1234 5678910 11 12 13 14 15 16 17 18 19 20
123 4567
8910 11 12 13 14 15 16
56
78 2 1
94
310
24 22 23 251112131415
261617181920 21
34 12 8910 11
12 13 14 15 16 17 18 19 20 21 22 23 24567
D: B137 :
B: B135 :C: B136 :
A: i48
12345678
910 11 12 13 14 15 16
B: i49
12345678910
11 12 13 14 15 1617 18 19 20
: TURBO MODEL : B33
NON-TURBO MODEL : A91*
: TURBO MODEL : B24
NON-TURBO MODEL : A132*
: TURBO MODEL : B25
NON-TURBO MODEL : A143*
: TURBO MODEL : C30
NON-TURBO MODEL : B114*
: TURBO MODEL : D17
NON-TURBO MODEL : C115*
: TURBO MODEL : D13
NON-TURBO MODEL : D136*
: TURBO MODELTB
: NON-TURBO MODEL
NA
: EXCEPT NON-TURBO
AT MODEL
ET
ETNA
TB
TBNANANATB
1112
10
3
18 1
*2*3*4*5*6*
2F2
B100
ET
ETTA
TA
ET
TA
ET
: TURBO AT MODEL
TATA
TA
ET
:
ET :
F16
F17
TA :
TA :
567
82 1
94 310
24 22 23 2511 12 13 14 15
26 27
2816 17 18 19
20 21
29 30 31 32 33 34 3556
782 1
94 310
24 22 23 2511 12 13
1415
26 27
2816
17 18 19 20 21
33 34 29
32 30
31 35
567
82 1
94 310
22 23 11 12 13 14 15
24 25
2616 17
18 19 20 21
27 28 29 30 31
12
1
2
2 1
12