Subaru 2009 IMPREZA Service Manual page 2764

Step
1 CHECK POWER SUPPLY VOLTAGE FOR
SUNLOAD SENSOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from sunload
sensor.
3) Turn the ignition switch to ON.
4) Measure the power supply voltage for sun-
load sensor.
Connector & terminal
(i51) No. 2 (+) — No. 1 (–):
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 — (i88) 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 — (i88) No. 14:
4 CHECK INPUT VOLTAGE FOR AUTO A/C
CONTROL MODULE.
1) Connect the connectors of sunload sensor
and auto A/C control module.
2) Turn the ignition switch to ON.
3) Measure the voltage between connector
terminals of auto A/C control module.
Connector & terminal
(i88) No. 16 (+) — (i88) No. 14 (–):
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 ? Go to step 3.
Is the resistance less than 1 ? Go to step 4.
Is the voltage between approx.
1.0 — 4.0 V?
Is there poor contact of connec-
tor?
AC(diag)-35
HVAC SYSTEM (AUTO A/C) (DIAGNOSTICS)
Check Yes
Go to step 4.
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. <Ref.
to AC-42,
REMOVAL, Sun-
load Sensor (Auto
A/C Model).>
Replace the auto
A/C control mod-
ule. <Ref. to AC-
33, REMOVAL,
Control Unit (Auto
A/C Model).>