2009 SUBARU TRIBECA Service Workshop Manual

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Page 377 of 2453

SUBARU TRIBECA 2009 1.G Service Workshop Manual AC-51
General Diagnostic Table
HVAC SYSTEM (HEATER, VENTILATOR AND A/C)
Air does not come out of the rear A/C.
Rear cooler blower
Rear cooler blower resistor
Rear cooler switch
Wiring harness
Air does

Page 378 of 2453

SUBARU TRIBECA 2009 1.G Service Workshop Manual AC-52
General Diagnostic Table
HVAC SYSTEM (HEATER, VENTILATOR AND A/C)

Page 379 of 2453

SUBARU TRIBECA 2009 1.G Service Workshop Manual AC(diag)-2
Basic Diagnostic Procedure
HVAC SYSTEM (AUTO A/C) (DIAGNOSTICS)
1. Basic Diagnostic Procedure
A: PROCEDURE
Step Check Yes No
1START INSPECTIONS.
1) Perform the pre-inspection. <Ref. to
AC(

Page 380 of 2453

SUBARU TRIBECA 2009 1.G Service Workshop Manual AC(diag)-3
General Description
HVAC SYSTEM (AUTO A/C) (DIAGNOSTICS)
2. General Description
A: CAUTION
1) Never connect the battery in reverse polarity.
•Auto A/C control module may be destroyed in-

AC(diag)-3
General Description
HVAC SYSTEM (AUTO A/C) (DIAGNOSTICS)
2. General Description
A: CAUTION
1) Never connect the battery in reverse polarity.
•Auto A/C control module may be destroyed in-
stantly.
2) Do not disconnect the battery terminals while the
engine is running.
•A large counter electromotive force will be gener-
ated 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 the ignition switch to OFF.
•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 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 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 the battery voltage and specific gravity
of electrolyte.
Standard voltage: 12 V
Specific gravity: 1.260 or more
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 to maximum
hot position.
3) Turn the air flow control dial to “DEF” position.
4) Turn the fan speed control dial to 4th position.
5) Put a strip of paper close to the front side of in-
vehicle sensor suction port (A) located in the driv-
er’s side console side panel, and check that air is
being sucked into the port by seeing the paper
moving towards the port.
NOTE:
Be careful not to let the paper get sucked into the
port.
6) If the paper does not move at all, remove the
driver’s side console side panel MOVAL, Center Console.> and check for improper
connection of the aspirator hose, 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.
AC-01323
AC-01324
(A)

Page 381 of 2453

SUBARU TRIBECA 2009 1.G Service Workshop Manual AC(diag)-4
General Description
HVAC SYSTEM (AUTO A/C) (DIAGNOSTICS)
4. CONTROL SWITCHES
Start the engine and warm-up completely.
1) Inspection using switches
2) Compressor operation inspection
3) Insp

AC(diag)-4
General Description
HVAC SYSTEM (AUTO A/C) (DIAGNOSTICS)
4. CONTROL SWITCHES
Start the engine and warm-up completely.
1) Inspection using switches
2) Compressor operation inspection
3) Inspection of illumination control
No. Point to check Switch operation Judgment standard
1OFF switch Press the OFF switch.
Setting temperature display goes out.
•Blower fan: OFF
•Inlet opening: FRESH
•Compressor: OFF
2
AU TO sw it c h, d r iver ’s
side temperature con-
trol dial and passen-
ger’s side temperature
control dial
1) Press the AUTO switch.
2) Turn the temperature control dial to the left
fully, and set to 18°C (65°F) (maximum cool posi-
tion).
AU TO di sp l ay i l lu mi n at e s.
•Outlet air temperature: COOL
•Blower fan: HI (AUTO)
•Outlet opening: FACE
•Inlet opening: AUTO
•Compressor: AUTO
3) Turn the temperature control dial to the right
slowly, and change the setting from 18°C (64°F)
(maximum cool position) to 32°C (85°F).
•Outlet air temperature: COOL → HOT
•Blower fan: AUTO
•Outlet opening: FACE → B/L → FOOTHEAT
•Inlet opening: AUTO
•Compressor: AUTO
4) Turn the temperature control dial to the right
fully, and set to 32°C (85°F) (maximum hot posi-
tion).
•Outlet air temperature: HOT
•Blower fan: HI (AUTO)
•Outlet opening: HEAT
•Inlet opening: FRESH (AUTO)
•Compressor: AUTO
3Defroster switch Press the defroster switch.
Defroster switch indicator illuminates.
•Outlet air temperature: AUTO
•Blower fan: AUTO
•Outlet opening: DEF
•Inlet opening: FRESH
•Compressor: ON
4FRESH/RECIRC
switchPress the FRESH/RECIRC switch.
Inlet opening switches RECIRC → FRESH or
FRESH → RECIRC each time pressing the
switch.
5MODE switch Press the MODE switch.Outlet opening switches FACE → B / L → HEAT
→ D/H each time pressing the switch.
6FAN switch Turn the FAN switch.
Blower fan switches OFF → LO → M1 → M2
→ M3 → M4 → HI each time turning the
switch and it switches in reverse order when
turned backward.
No. Point to check Switch operation Judgment standard
1Compressor1) Turn the A/C switch to ON.
2) Set the FAN switch between LO and HI.Compressor: ON
No. Point to check Switch operation Judgment standard
1Illumination Turn the lighting switch to ON. Illumination comes on.

Page 382 of 2453

SUBARU TRIBECA 2009 1.G Service Workshop Manual AC(diag)-5
General Description
HVAC SYSTEM (AUTO A/C) (DIAGNOSTICS)
4) Inspection of the rear cooler switch
5) Inspection of rear cooler
6) Inspection of illumination control
No. Point to check Switch

Page 383 of 2453

SUBARU TRIBECA 2009 1.G Service Workshop Manual AC(diag)-6
Electrical Component Location
HVAC SYSTEM (AUTO A/C) (DIAGNOSTICS)
3. Electrical Component Location
A: LOCATION
1. ENGINE COMPARTMENT
(1) A/C compressor (3) Pressure switch (4) Ambient sens

Page 384 of 2453

SUBARU TRIBECA 2009 1.G Service Workshop Manual AC(diag)-7
Electrical Component Location
HVAC SYSTEM (AUTO A/C) (DIAGNOSTICS)
2. PASSENGER COMPARTMENT
(1) Evaporator sensor (4) Blower motor (7) Mode door actuator
(2) Passenger’s side air mix door

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