Subaru Legacy IV (2008 year). Service manual — part 993
AC(diag)-24
Diagnostic Procedure for Actuators
HVAC SYSTEM (AUTO A/C) (DIAGNOSTICS)
B: MODE DOOR ACTUATOR
TROUBLE SYMPTOM:
Air flow outlet is not changed.
WIRING DIAGRAM:
AC-01647
B77
B282
B282
B77
36
1
7
6
27
16
5
3
8
3
1 2 3 4 5 6 7
1 2 3 4 5 6 7 8 9 10
21 22 23 24 25 26 27 28 29 30
11 12 13 14 15 16 17 18 19 20
31 32 33 34 35 36 37 38 39 40
AUTO A/C
CONTROL MODULE
MODE DOOR
ACTUATOR
AC(diag)-25
Diagnostic Procedure for Actuators
HVAC SYSTEM (AUTO A/C) (DIAGNOSTICS)
Step
Check
Yes
No
1
CHECK POWER SUPPLY FOR MODE DOOR
ACTUATOR POSITION SENSOR.
1) Turn the ignition switch to OFF.
2) Disconnect the mode door actuator connec-
tor.
3) Turn the ignition switch and AUTO switch to
ON.
4) Measure the voltage between auto A/C con-
trol module connector terminals.
Connector & terminal
(B282) No. 8 (+) — (B282) No. 27 (–):
Is the voltage approx. 5 V?
Go to step 2.
Replace the auto
A/C control mod-
ule.
2
CHECK POWER SUPPLY FOR MODE DOOR
ACTUATOR.
Measure the voltage between auto A/C control
module connector and chassis ground after
turning the air flow control switch to FACE posi-
tion.
Connector & terminal
(B282) No. 16 (+) — Chassis ground (–):
Is the voltage 7 V (at normal
temperature)?
Go to step 3.
Replace the auto
A/C control mod-
ule.
3
CHECK POWER SUPPLY FOR MODE DOOR
ACTUATOR.
Measure the voltage between auto A/C control
module connector and chassis ground after
turning the air flow control switch to DEF posi-
tion.
Connector & terminal
(B282) No. 36 (+) — Chassis ground (–):
Is the voltage 7 V (at normal
temperature)?
Go to step 4.
Replace the auto
A/C control mod-
ule.
4
CHECK HARNESS BETWEEN AUTO A/C
CONTROL MODULE AND MODE DOOR AC-
TUATOR.
1) Turn the A/C and ignition switch to OFF.
2) Disconnect the auto A/C control module
connector.
3) Measure the resistance between auto A/C
control module and mode door actuator con-
nector.
Connector & terminal
(B77) No. 1 — (B282) No. 27:
(B77) No. 3 — (B282) No. 8:
(B77) No. 5 — (B282) No. 3:
(B77) No. 6 — (B282) No. 36:
(B77) No. 7 — (B282) No. 16:
Is the resistance less than 1
:? Go to step 5.
Repair the harness
between auto A/C
control module and
mode door actua-
tor.
5
CHECK MODE DOOR ACTUATOR POSI-
TION SWITCH SIGNAL.
1) Connect the connector of auto A/C control
module and mode door actuator.
2) Turn the ignition switch and AUTO switch to
ON.
3) Check the voltage between auto A/C control
module connector terminals while changing the
mode between DEF and FACE.
Connector & terminal
(B282) No. 3 (+) — (B282) No. 27 (–):
Does the voltage change
between 1 V (DEF) and 4 V
(FACE)?
Go to step 6.
Replace the mode
door actuator.
6
CHECK POOR CONTACT.
Check poor contact of auto A/C control module
and connector.
Is there poor contact in connec-
tor?
Repair the connec-
tor.
Replace the auto
A/C control mod-
ule.
AC(diag)-26
Diagnostic Procedure for Actuators
HVAC SYSTEM (AUTO A/C) (DIAGNOSTICS)
C: AIR MIX DOOR ACTUATOR
TROUBLE SYMPTOM:
Outlet air temperature does not change.
WIRING DIAGRAM:
B235
B282
B282
B235
3
7
6
5
1
1
3 4 5
7
2
6
B390
1
7
6
5
3
B390
27
17
4
18
8
38
24
37
AC-01648
1 2 3 4 5 6 7 8 9 10
21 22 23 24 25 26 27 28 29 30
11 12 13 14 15 16 17 18 19 20
31 32 33 34 35 36 37 38 39 40
AUTO A/C
CONTROL MODULE
DRIVER'S
AIR MIX DOOR
ACTUATOR
PASSENGER'S
AIR MIX DOOR
ACTUATOR
AC(diag)-27
Diagnostic Procedure for Actuators
HVAC SYSTEM (AUTO A/C) (DIAGNOSTICS)
Step
Check
Yes
No
1
CHECK POWER SUPPLY FOR AIR MIX
DOOR ACTUATOR POSITION SWITCH.
1) Turn the ignition switch to OFF.
2) Disconnect the air mix door actuator con-
nector.
3) Turn the ignition switch and AUTO switch to
ON.
4) Measure the voltage between auto A/C con-
trol module connector terminals.
Connector & terminal
(B282) No. 8 (+) — (B282) No. 27 (–):
Is the voltage approx. 5 V?
Go to step 2.
Replace the auto
A/C control mod-
ule.
2
CHECK POWER SUPPLY FOR AIR MIX
DOOR ACTUATOR.
Measure the voltage between auto A/C control
module connector and chassis ground after
turning the temperature control dial to maxi-
mum COOL position.
Connector & terminal
Driver’s side
(B282) No. 18 (+) — Chassis ground (–):
Passenger’s side
(B282) No. 17 (+) — Chassis ground (–):
Is the voltage 7 V (at normal
temperature)?
Go to step 3.
Replace the auto
A/C control mod-
ule.
3
CHECK POWER SUPPLY FOR AIR MIX
DOOR ACTUATOR.
Measure the voltage between auto A/C control
module connector and chassis ground after
turning the temperature control dial to maxi-
mum HOT position.
Connector & terminal
Driver’s side
(B282) No. 38 (+) — Chassis ground (–):
Passenger’s side
(B282) No. 37 (+) — Chassis ground (–):
Is the voltage 7 V (at normal
temperature)?
Go to step 4.
Replace the auto
A/C control mod-
ule.
4
CHECK HARNESS BETWEEN AUTO A/C
CONTROL MODULE AND AIR MIX DOOR
ACTUATOR.
1) Turn the A/C and ignition switch to OFF.
2) Disconnect the auto A/C control module
connector.
3) Measure the resistance between auto A/C
control module and air mix door actuator con-
nector.
Connector & terminal
Driver’s side
(B390) No. 1 — (B282) No. 27:
(B390) No. 3 — (B282) No. 8:
(B390) No. 5 — (B282) No. 24:
(B390) No. 6 — (B282) No. 38:
(B390) No. 7 — (B282) No. 18:
Passenger’s side
(B235) No. 1 — (B282) No. 8:
(B235) No. 3 — (B282) No. 27:
(B235) No. 5 — (B282) No. 4:
(B235) No. 6 — (B282) No. 17:
(B235) No. 7 — (B282) No. 37:
Is the resistance less than 1
:? Go to step 5.
Repair the harness
between auto A/C
control module and
air mix door actua-
tor.
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