Subaru Forester 2004 - Page 78

AC-24
HVAC SYSTEM (AUTO A/C)(DIAGNOSTIC)
Diagnostic Procedure for Actuators
Step Check Yes No
1 CHECK POWER SUPPLY FOR AUTO A/C
CONTROL MODULE SIDE.
1) Turn the ignition switch to ON.
2) Turn the mode control dial to VENT posi-
tion.
3) Press the defroster switch and measure the
voltage between auto A/C control module and
chassis ground when VENT is changed to DEF
position.
Connector & terminal
(i49) No. 9 (+) — Chassis ground (
− ):
Is the voltage more than 12 V? Go to step 2. Replace the auto
A/C control mod-
ule.
2 CHECK POWER SUPPLY FOR ACTUATOR
SIDE.
1) Turn the mode control dial to VENT posi-
tion.
2) Press the defroster switch and measure the
voltage between mode door actuator harness
connector and chassis ground when VENT is
changed to DEF position.
Connector & terminal
(B77) No. 1 (+) — Chassis ground (
− ):
Is the voltage more than 7 V (at
normal temperature)?
Go to step 3. Repair the har-
ness between auto
A/C control mod-
ule and mode door
actuator.
3 CHECK POWER SUPPLY FOR AUTO A/C
CONTROL MODULE SIDE.
1) Press the defroster switch.
2) Turn the mode control dial to VENT position
and measure the voltage between auto A/C
control module and chassis ground when DEF
is changed to VENT position.
Connector & terminal
(i49) No. 8 (+) — Chassis ground (
− ):
Is the voltage more than 12 V? Go to step 4. Replace the auto
A/C control mod-
ule.
4 CHECK POWER SUPPLY FOR ACTUATOR
SIDE.
1) Press the defroster switch.
2) Turn the mode control dial to VENT position
and measure the voltage between mode door
actuator harness connector and chassis
ground when DEF is changed to VENT posi-
tion.
Connector & terminal
(B77) No. 2 (+) — Chassis ground (
− ):
Is the voltage more than 7 V (at
normal temperature)?
Go to step 5. Repair the har-
ness between auto
A/C control mod-
ule and mode door
actuator.
5 CHECK ACTUATOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from mode door
actuator.
3) Connect the battery positive (+) terminal to
terminal No. 1 and ground (−) terminal to termi-
nal No. 2 of mode door actuator to make sure
that actuator operates.
4) Connect the battery positive (+) terminal to
terminal No. 2 and ground (−) terminal to termi-
nal No. 1 of mode door actuator to make sure
that actuator operates.
Does the motor operate nor-
mally?
Go to step 6. Replace the mode
door actuator.