2009 SUBARU TRIBECA Service Workshop Manual

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Page 409 of 2453

SUBARU TRIBECA 2009 1.G Service Workshop Manual AC(diag)-32
Diagnostic Procedure for Sensors
HVAC SYSTEM (AUTO A/C) (DIAGNOSTICS)
Step Check Yes No
1CHECK AMBIENT SENSOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from ambient

AC(diag)-32
Diagnostic Procedure for Sensors
HVAC SYSTEM (AUTO A/C) (DIAGNOSTICS)
Step Check Yes No
1CHECK AMBIENT SENSOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from ambient
sensor.
3) Measure the resistance between connector
terminals of ambient sensor.
Te r m i n a l s
No. 1 — No. 2:
Is the resistance approximately
1.7 kΩ at 25°C (77°F)?
Go to step 2.Replace the ambi-
ent sensor.
2CHECK INPUT SIGNAL FOR AMBIENT SEN-
SOR.
1) Turn the ignition to ON.
2) Measure the voltage between connector
(F78) terminals.
Connector & terminal
(F78) No. 1 (+) — No. 2 (–):
Is the voltage approx. 5 V? Go to step 6.Go to step 3.
3CHECK OUTPUT SIGNAL OF BODY INTE-
GRATED UNIT.
1) Turn the ignition switch to OFF.
2) Draw out the body integrated unit.
3) Disconnect the connector from ambient
sensor.
4) Turn the ignition switch to ON.
5) Measure the voltage between connector
terminals of body integrated unit.
Connector & terminal
(B281) No. 3 (+) — No. 10 (–):
Is the voltage approx. 5 V? Go to step 4.Go to step 6.
4CHECK HARNESS CONNECTOR BETWEEN
BODY INTEGRATED UNIT AND AMBIENT
SENSOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from body inte-
grated unit.
3) Measure the resistance of harness
between body integrated unit and ambient sen-
sor.
Connector & terminal
(F78) No. 1 — (B281) No. 10:
Is the resistance less than 1
Ω?
Go to step 5.Repair the open
circuit of harness
between body inte-
grated unit and
ambient sensor.
5CHECK HARNESS CONNECTOR BETWEEN
BODY INTEGRATED UNIT AND AMBIENT
SENSOR.
Measure the resistance of harness between
body integrated unit and ambient sensor.
Connector & terminal
(F78) No. 2 — (B281) No. 3:
Is the resistance less than 1
Ω?
Go to step 6.Repair the open
circuit of harness
between body inte-
grated unit and
ambient sensor.
6CHECK COMMUNICATION ERROR DIS-
PLAY.
1) Connect the connectors of body integrated
unit and ambient sensor as originally con-
nected.
2) Check if “Er xx” is displayed on the Odo/Trip
meter in combination meter after turning the
ignition switch to ON.
Is “Er xx” displayed? Check the commu-
nication circuit.
LAN(diag)-2, Basic
Diagnostic Proce-
dure.>
Go to step 7.
7CHECK POOR CONTACT.
Check poor contact of 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. 32, REMOVAL,
Control Unit (Auto
A/C Model).>

Page 410 of 2453

SUBARU TRIBECA 2009 1.G Service Workshop Manual AC(diag)-33
Diagnostic Procedure for Sensors
HVAC SYSTEM (AUTO A/C) (DIAGNOSTICS)
B: IN-VEHICLE SENSOR
TROUBLE SYMPTOM:
Blower fan speed, outlet port and inlet port do not change after turning the AUT

Page 411 of 2453

SUBARU TRIBECA 2009 1.G Service Workshop Manual AC(diag)-34
Diagnostic Procedure for Sensors
HVAC SYSTEM (AUTO A/C) (DIAGNOSTICS)
Step Check Yes No
1CHECK IN-VEHICLE SENSOR.
1) Turn the ignition switch to OFF.
2) Remove the driver’s side lower co

AC(diag)-34
Diagnostic Procedure for Sensors
HVAC SYSTEM (AUTO A/C) (DIAGNOSTICS)
Step Check Yes No
1CHECK IN-VEHICLE SENSOR.
1) Turn the ignition switch to OFF.
2) Remove the driver’s side lower cover.
3) Disconnect the connector from in-vehicle
sensor.
4) Measure the resistance between connector
terminals of in-vehicle sensor.
Te r m i n a l s
No. 1 — No. 2:
Is the resistance approximately
1.7 kΩ at 20°C (68°F)?
Go to step 2.Replace the in-
vehicle sensor.
2CHECK INPUT SIGNAL FOR IN-VEHICLE
SENSOR.
1) Turn the ignition switch to ON.
2) Measure the voltage between in-vehicle
sensor harness connector terminal and chas-
sis ground.
Connector & terminal
(i55) No. 2 (+) — No. 1 (–):
Is the voltage approx. 5 V? Go to step 6.Go to step 3.
3CHECK AUTO A/C CONTROL MODULE
OUTPUT SIGNAL.
1) Turn the ignition switch to OFF.
2) Remove the auto A/C control module.
3) Turn the ignition switch to ON.
4) Measure the voltage between connector
terminals of auto A/C control module.
Connector & terminal
(B282) No. 5 (+) — (B282) No. 15 (–):
Is the voltage approx. 5 V? Go to step 4.Go to step 6.
4CHECK HARNESS BETWEEN AUTO A/C
CONTROL MODULE AND IN-VEHICLE SEN-
SOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from auto A/C
control module.
3) Measure the resistance of harness
between auto A/C control module and in-vehi-
cle sensor.
Connector & terminal
(i55) No. 2 — (B282) No. 5:
Is the resistance less than 1
Ω?
Go to step 5.Repair the har-
ness between auto
A/C control mod-
ule and in-vehicle
sensor.
5CHECK HARNESS BETWEEN AUTO A/C
CONTROL MODULE AND IN-VEHICLE SEN-
SOR.
Measure the resistance of harness between
auto A/C control module and in-vehicle sensor.
Connector & terminal
(i55) No. 1 — (B282) No. 15:
Is the resistance less than 1
Ω?
Go to step 6.Repair the har-
ness between auto
A/C control mod-
ule and in-vehicle
sensor.
6CHECK POOR CONTACT.
Check poor contact of 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. 32, REMOVAL,
Control Unit (Auto
A/C Model).>

Page 412 of 2453

SUBARU TRIBECA 2009 1.G Service Workshop Manual AC(diag)-35
Diagnostic Procedure for Sensors
HVAC SYSTEM (AUTO A/C) (DIAGNOSTICS)
C: EVAPORATOR SENSOR
WIRING DIAGRAM:
AC-00831
A13A15
B8812
EVAPORATORSENSOR
B88
B282A:AUTO A/CCONTROL MODULE
12123412

Page 413 of 2453

SUBARU TRIBECA 2009 1.G Service Workshop Manual AC(diag)-36
Diagnostic Procedure for Sensors
HVAC SYSTEM (AUTO A/C) (DIAGNOSTICS)
Step Check Yes No
1CHECK EVAPORATOR SENSOR
1) Turn the ignition switch to OFF.
2) Remove the glove box.
3) Disconnect

AC(diag)-36
Diagnostic Procedure for Sensors
HVAC SYSTEM (AUTO A/C) (DIAGNOSTICS)
Step Check Yes No
1CHECK EVAPORATOR SENSOR
1) Turn the ignition switch to OFF.
2) Remove the glove box.
3) Disconnect the connector from evaporator
sensor.
4) Measure the resistance between connector
terminals of evaporator sensor.
Te r m i n a l s
No. 1 — No. 2:
Is the resistance approximately
1.9 kΩ at 20°C (68°F)?
Go to step 2.Replace the evap-
orator sensor.
REMOVAL, Evap-
orator.>
2CHECK INPUT SIGNAL FOR EVAPORATOR
SENSOR.
1) Turn the ignition switch to ON.
2) Measure the voltage between connector
(B88) terminal and chassis ground.
Connector & terminal
(B88) No. 1 (+) — No. 2 (–):
Is the voltage approx. 5 V? Go to step 6.Go to step 3.
3CHECK AUTO A/C CONTROL MODULE
OUTPUT SIGNAL.
1) Turn the ignition switch to OFF.
2) Remove the auto A/C control module.
3) Turn the ignition switch to ON.
4) Measure the voltage between connector
terminals of auto A/C control module.
Connector & terminal
(B282) No. 13 (+) — No. 15 (–):
Is the voltage approx. 5 V? Go to step 4.Go to step 6.
4CHECK HARNESS CONNECTOR BETWEEN
AUTO A/C CONTROL MODULE AND EVAP-
ORATOR SENSOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from auto A/C
control module.
3) Measure the resistance of harness
between auto A/C control module and evapo-
rator sensor.
Connector & terminal
(B88) No. 2 — (B282) No. 15:
Is the resistance less than 1
Ω?
Go to step 5.Repair the open
circuit of harness
between auto A/C
control module
and evaporator
sensor.
5CHECK HARNESS CONNECTOR BETWEEN
AUTO A/C CONTROL MODULE AND EVAP-
ORATOR SENSOR.
Measure the resistance of harness between
auto A/C control module and evaporator sen-
sor.
Connector & terminal
(B88) No. 1 — (B282) No. 13:
Is the resistance less than 1
Ω?
Go to step 6.Repair the open
circuit of harness
between auto A/C
control module
and evaporator
sensor.
6CHECK POOR CONTACT.
Check poor contact of 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. 32, REMOVAL,
Control Unit (Auto
A/C Model).>

Page 414 of 2453

SUBARU TRIBECA 2009 1.G Service Workshop Manual AC(diag)-37
Diagnostic Procedure for Sensors
HVAC SYSTEM (AUTO A/C) (DIAGNOSTICS)
D: SUNLOAD SENSOR
TROUBLE SYMPTOM:
•Sensor identifies that sunlight is at maximum. Then, A/C system is controlled to

Page 415 of 2453

SUBARU TRIBECA 2009 1.G Service Workshop Manual AC(diag)-38
Diagnostic Procedure for Sensors
HVAC SYSTEM (AUTO A/C) (DIAGNOSTICS)
Step Check Yes No
1CHECK POWER SUPPLY VOLTAGE FOR
SUNLOAD SENSOR.
1) Turn the ignition switch to OFF.
2) Disconnect t

Page 416 of 2453

SUBARU TRIBECA 2009 1.G Service Workshop Manual AC(diag)-39
Diagnostics with Phenomenon
HVAC SYSTEM (AUTO A/C) (DIAGNOSTICS)
9. Diagnostics with Phenomenon
A: INSPECTION
Symptom Problem parts
A/C system fails to operate.
•Fuse (M/B No. 15, F/B No

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