2004 SUBARU FORESTER wiring

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-51
HVAC SYSTEM (HEATER, VENTILATOR AND A/C)
General Diagnostics
Temperature of air from vents does not change.Wiring harness
Air mix actuator (Auto A/C), Temperature control cable (Manual
A/C)
Temperature adjustment switch
Unable to switch blow vents.Wiring harness
Mode actuator (Auto A/C), Mode control cable (Manual A/C)
Mode switch
Unable to switch suction vents.Wiring harness
FRESH/RECIRC actuator
Air inlet select switch Symptom Repair order

AC-3
HVAC SYSTEM (AUTO A/C)(DIAGNOSTIC)
General Description
2. General Description
A: CAUTION
1) Never connect the battery in reverse polarity.
Auto A/C control module may be destroyed instant-
ly.
2) Do not disconnect the battery terminals while the
engine is running.
A large counter electromotive force will be generat-
ed in the generator, and this voltage may damage
electronic parts such as auto A/C control module,
etc.
3) Before disconnecting the connectors of each
sensor and the auto A/C control module, be sure to
turn off the ignition switch.
Auto A/C control module may be damaged.
4) Every A/C-related part is a precision part. Do not
drop them.
5) Airbag system wiring harness is routed near the
A/C control panel (auto A/C control module) and
junction box.
CAUTION:
 For airbag system, yellow-colored wiring har-
ness and connectors are all used. Do not use
the electrical test equipment on these circuits.
 Be careful not to damage the airbag system
wiring harness when servicing the A/C control
panel (auto A/C control module) and junction
box.
B: INSPECTION
Before performing the diagnosis, check the follow-
ing items which might affect A/C system problems.
1. BATTERY
1) Measure battery voltage and specific gravity of
electrolyte.
Standard voltage: 12 V
Specific gravity: More than 1.260
2) Check the condition of the fuses for A/C system
power supply and other fuses.
3) Check the condition of harness and harness
connector connections.
2. ASPIRATOR HOSE
1) Turn the ignition switch to ON, and press the A/
C switch.
2) Turn the temperature control dial at maximum
hot position.
3) Press the defroster switch.
4) Turn the fan speed control dial to 4th position.5) Approach a strip of paper (b) in front of the in-ve-
hicle sensor suction port (a) located in the instru-
ment lower cover, and check that air is being
sucked into the port by seeing the paper moving to-
wards port.
NOTE:
Be careful not to let the paper get sucked into port.
6) If the paper does not move at all, remove the in-
strument panel lower cover MOVAL, Instrument Panel Assembly.> and check
for improper connection of the aspirator hose (a),
in-vehicle sensor and heater unit, and repair them if
necessary.
3. A/C LINE
Check the connection for A/C line (A) and lower
side high-pressure pipe.
4. CONTROL LINKAGE
1) Check the state of mode door linkage.
2) Check the state of air mix door linkage.
3) Check the state of intake door linkage.
AC-00094
(a)
(a)
(b)
AC-00065
(a)
AC-00096
(A)

AC-8
HVAC SYSTEM (AUTO A/C)(DIAGNOSTIC)
Auto A/C Control Module I/O Signal
*1: Battery voltage is indicated when motor running, 0 V or battery voltage pulse signal is output when motor stops.
*2: Battery voltage is indicated when motor running, 0 V is indicated when motor stops.
*3: Voltage can not be measured because of pulse signal.
B: WIRING DIAGRAM:

A14Combination meter (ambient temperature sig-
nal)*3 *3
A13 Mode door actuator position detection signal OutletVENT, BI-LEVEL, HEAT 5 V
DEF/HEAT, DEF 0 V
A12 Mode door actuator position detection signal OutletVENT, DEF/HEAT 5 V
BI-LEVEL, HEAT, DEF 0 V
A10 A/C cutout signalA/C: ON Battery voltage
Pressure switch operated 0 V
A9 Illumination ground When there is continuity to chassis ground 0 Ω Terminal No. Content Measuring conditionSpecified
value

AC-12
HVAC SYSTEM (AUTO A/C)(DIAGNOSTIC)
Diagnostics for A/C System Malfunction
6. Diagnostics for A/C System Malfunction
A: A/C OR SELF-DIAGNOSIS SYSTEMS DO NOT OPERATE
TROUBLE SYMPTOM:
 Switch LEDs are faulty and switches do not operate.
 Self-diagnosis system does not operate.
WIRING DIAGRAM:
AC-00149
A:
i48B:
i49B201
12345678
910 11 12 13 14 15 1612345678910
11 12 13 14 15 16 17 18 19 20
E
A:
i48B:
i49
i40
B201
SBF-1BATTERY IGNITION
SWITCH
AUTO A/C CONTROL MODULE
M/B NO.2SBF-4
F/B NO.17
B5B4B11
3
4 128910 11
12 13 14 15 16 17 18 19 20 21 22 23 2456 7
B202
3
4 128910 11
12 13 14 15 16 17 18 19 20 21 22 23 24567
LHD
14
4
10
19 2113RHD
: LHD MODEL
: RHD MODELLHD
RHD
: LHD
: LHD
B202: RHD
i41: RHD

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-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

AC-21
HVAC SYSTEM (AUTO A/C)(DIAGNOSTIC)
Diagnostic Procedure for Actuators
7. Diagnostic Procedure for Actuators
A: INTAKE DOOR ACTUATOR
TROUBLE SYMPTOM:
FRESH/RECIRC mode is not changed.
WIRING DIAGRAM:
AC-00153
B91A:
i48B:
i49
12345678
910 11 12 13 14 15 1612345678910
11 12 13 14 15 16 17 18 19 20
B91
i41 :
B202 : IGNITION
SWITCHBATTERY
SBF-1SBF-4F/B NO.17
43
141312
B18B20B19
1234
B202
34 12 8910 11
12 13 14 15 16 17 18 19 20 21 22 23 24567
A:
i48B:
i49AUTO A/C CONTROL
MODULE
INTAKE DOOR
ACTUATOR
B201
34 12 8910 11
12 13 14 15 16 17 18 19 20 21 22 23 2456 7
: LHD MODEL
: RHD MODELLHD
RHD
: LHD MODEL : 2
: RHD MODEL : 1
: LHD MODEL : 1
: RHD MODEL : 2
1*
2*
LHD465RHD
i40 :
B201 :
LHDRHD
LHDRHD
1*2*