Subaru B9 TRIBECA WX 2007 Manual page 471

asieps_tobira.book 32 ページ ２０１２年２月１０日 金曜日 午後３時２６分
HVAC SYSTEM (AUTO A/C) (DIAGNOSTICS)
Step
1 CHECK 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.
Terminals
No. 1 — No. 2:
2 CHECK 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 (–):
3 CHECK 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 (–):
4 CHECK 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 sensor.
Connector & terminal
(F78) No. 1 — (B281) No. 10:
5 CHECK 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:
6 CHECK 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.
7 CHECK POOR CONTACT.
Check poor contact of auto A/C control module
connector.
Diagnostic Procedure for Sensors
Is the resistance approximately
1.7 kΩ at 25°C (77°F)?
Is the voltage approx. 5 V?
Is the voltage approx. 5 V?
Is the resistance less than 1 Ω? Go to step 5.
Is the resistance less than 1 Ω? Go to step 6.
Is "Er xx" displayed?
Is there poor contact in connec-
tor?
AC(diag)-32
Check Yes
Go to step 2.
Go to step 6.
Go to step 4.
Check the commu-
nication circuit.
<Ref. to
LAN(diag)-2, Basic
Diagnostic Proce-
dure.>
Repair the connec-
tor.
No
Replace the ambi-
ent sensor.
Go to step 3.
Go to step 6.
Repair the open
circuit of harness
between body inte-
grated unit and
ambient sensor.
Repair the open
circuit of harness
between body inte-
grated unit and
ambient sensor.
Go to step 7.
Replace the auto
A/C control mod-
ule. <Ref. to AC-
33, REMOVAL,
Control Unit (Auto
A/C Model).>