Subaru IMPREZA GD 2007 Series Manual page 3895

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HVAC SYSTEM (AUTO A/C) (DIAGNOSTICS)
Step
1 CHECK INPUT VOLTAGE TO SUNLOAD
SENSOR.
1) Turn the ignition switch to ON.
2) Measure the input voltage to the sunload
sensor.
Connector & terminal
(i51) No. 2 (+) — Chassis ground (–):
2 CHECK HARNESS CONNECTOR BETWEEN
AUTO A/C CONTROL MODULE AND SUN-
LOAD SENSOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from the auto A/C
control module.
3) Measure the resistance of the harness
between the auto A/C control module and sun-
load sensor.
Connector & terminal
(i51) No. 2 — (B283) No. 16:
3 CHECK HARNESS CONNECTOR BETWEEN
AUTO A/C CONTROL MODULE AND SUN-
LOAD SENSOR.
Measure the resistance of the harness between
the auto A/C control module and sunload sen-
sor.
Connector & terminal
(i51) No. 1 — (B283) No. 17:
4 CHECK INPUT VOLTAGE FOR AUTO A/C
CONTROL MODULE.
1) Connect the auto A/C control module con-
nector.
2) Turn the ignition switch to ON.
3) Measure the voltage between connector
terminals of auto A/C control module.
Connector & terminal
(B283) No. 16 (+) — (B283) No. 17 (–):
5 CHECK POOR CONTACT.
Check poor contact of auto A/C control module
connector.
Diagnostic Procedure for Sensors
Is the voltage approx. 5 V?
Is the resistance less than 1 Ω? Go to step 3.
Is the resistance less than 1 Ω? Go to step 4.
Is the voltage approx. 2.5 V?
Is there any poor contact in
connector?
AC(diag)-30
Check Yes
Go to step 3.
Go to step 5.
Repair the connec-
tor.
No
Go to step 2.
Repair the harness
between auto A/C
control module and
sunload sensor.
Repair the harness
between auto A/C
control module and
sunload sensor.
Replace the sun-
load sensor.
Replace the auto
A/C control mod-
ule.