Subaru 2009 IMPREZA Service Manual page 2758

Step
3 CHECK COMBINATION METER OUTPUT
SIGNAL.
1) Turn the ignition switch to OFF.
2) Draw out the combination meter.
3) Disconnect the connector from ambient
sensor.
4) Turn the ignition switch to ON.
5) Measure the voltage between the combina-
tion meter connector terminals.
Connector & terminal
(i10) No. 24 (+) — No. 23 (–):
4 CHECK HARNESS CONNECTOR BETWEEN
COMBINATION METER AND AMBIENT SEN-
SOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from the combi-
nation meter.
3) Measure the resistance of harness between
combination meter and ambient sensor.
Connector & terminal
(F78) No. 2 — (i10) No. 24:
5 CHECK HARNESS CONNECTOR BETWEEN
COMBINATION METER AND AMBIENT SEN-
SOR.
Measure the resistance of harness between
combination meter and ambient sensor.
Connector & terminal
(F78) No. 1 — (i10) No. 23:
6 CHECK HARNESS CONNECTOR BETWEEN
COMBINATION METER AND AUTO A/C
CONTROL MODULE.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from the combi-
nation meter.
3) Disconnect the auto A/C control module
connector.
4) Measure the resistance of harness between
the combination meter and auto A/C control
module.
Connector & terminal
(i88) No. 19 — (i10) No. 26:
7 CHECK HARNESS CONNECTOR BETWEEN
COMBINATION METER AND AUTO A/C
CONTROL MODULE.
Measure the resistance of harness between the
combination meter and auto A/C control mod-
ule.
Connector & terminal
(i88) No. 20 — (i10) No. 27:
8 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 5.
Is the resistance less than 1 ? Replace the com-
Is the resistance less than 1 ? Go to step 7.
Is the resistance less than 1 ? Go to step 8.
Is there poor contact of connec-
tor?
AC(diag)-29
HVAC SYSTEM (AUTO A/C) (DIAGNOSTICS)
Check Yes
Go to step 4.
bination meter.
<Ref. to IDI-16,
REMOVAL, Com-
bination Meter.>
Repair the connec-
tor.
No
Replace the com-
bination meter.
<Ref. to IDI-16,
REMOVAL, Com-
bination Meter.>
Repair the open
circuit of the har-
ness between the
combination meter
and ambient sen-
sor.
Repair the open
circuit of the har-
ness between the
combination meter
and ambient sen-
sor.
Repair the open
circuit in the har-
ness between the
combination meter
and auto A/C con-
trol module. <Ref.
to LAN(diag)-6,
LAN SYSTEM,
CAUTION, Gen-
eral Description.>
Repair the open
circuit in the har-
ness between the
combination meter
and auto A/C con-
trol module. <Ref.
to LAN(diag)-6,
LAN SYSTEM,
CAUTION, Gen-
eral Description.>
Replace the auto
A/C control mod-
ule. <Ref. to AC-
33, REMOVAL,
Control Unit (Auto
A/C Model).>