Subaru IMPREZA GD 2007 Series Manual page 3889

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HVAC SYSTEM (AUTO A/C) (DIAGNOSTICS)
Step
1 CHECK THE POWER SUPPLY OF THE
AUTO A/C CONTROL MODULE.
1) Turn the ignition switch to ON.
2) Turn the A/C switch to ON.
3) Measure the voltage between auto A/C con-
trol module harness connector terminal and
chassis ground.
Connector & terminal
(B283) No. 5 (+) — Chassis ground (–):
2 CHECK THE POWER SUPPLY OF THE AC-
TUATOR.
Measure the voltage between air mix door actu-
ator harness connector terminal and chassis
ground.
Connector & terminal
(B293) No. 1 (+) — Chassis ground (–):
3 CHECK SIGNAL FOR AUTO A/C CONTROL
MODULE SIDE.
Measure the voltage between auto A/C control
module harness connector terminal and chas-
sis ground using oscilloscope.
Connector & terminal
(B282) No. 4 (+) — Chassis ground (–):
4 CHECK THE SIGNALS OF THE ACTUATOR.
Measure the voltage between air mix door actu-
ator harness connector terminal and chassis
ground using oscilloscope.
Connector & terminal
(B293) No. 3 (+) — Chassis ground (–):
5 CHECK ACTUATOR GROUND CIRCUIT.
1) Turn the ignition switch and A/C switch to
OFF.
2) Measure the resistance between air mix
door actuator harness connector terminal and
chassis ground.
Connector & terminal
(B293) No. 2 — Chassis ground:
6 CHECK POOR CONTACT.
Check poor contact of auto A/C control module
connector.
Diagnostic Procedure for Actuators
Is the voltage 10 V or more?
Is the voltage 10 V or more?
Is the voltage approx. 5.5 V?
Is the voltage approx. 5.5 V?
Is the resistance less than 1 Ω? Go to step 6.
Is there poor contact in connec-
tor?
AC(diag)-24
Check Yes
Go to step 2.
Go to step 3.
Go to step 4.
Go to step 5.
Repair the connec-
tor.
No
Replace the auto
A/C control mod-
ule.
Repair the open
circuit of harness
between auto A/C
control module and
air mix door actua-
tor.
Replace the auto
A/C control mod-
ule.
Repair the open
circuit of harness
between auto A/C
control module and
air mix door actua-
tor.
Repair the open
circuit of harness
between air mix
door actuator and
chassis ground.
Replace the auto
A/C control mod-
ule.