Subaru Legacy (2005 year). Service manual - part 872

AC(diag)-5

HVAC SYSTEM (AUTO A/C) (DIAGNOSTICS)

Electrical Component Location

3. Electrical Component Location

A: LOCATION

1. ENGINE COMPARTMENT

(1)

A/C compressor

(3)

Pressure switch

(4)

Ambient sensor

(2)

A/C relay

AC-00896

(2)

(4)

(1)

(3)

AC(diag)-6

HVAC SYSTEM (AUTO A/C) (DIAGNOSTICS)

Electrical Component Location

2. PASSENGER COMPARTMENT

(1)

Evaporator sensor

(4)

Blower motor

(7)

Mode door actuator

(2)

Air mix door actuator

(5)

Sunload sensor

(8)

In-vehicle sensor

(3)

Auto A/C control module

(6)

Intake door actuator

AC-00813

(1)

AC-00815

(2)

AC-00814

(3)

AC-00816

(4)

(7)

(6)

(4)

(3)

(2)

(1)

(8)

(5)

AC-00897

AC(diag)-7

HVAC SYSTEM (AUTO A/C) (DIAGNOSTICS)

Electrical Component Location

 AC-00898

(1)

(2)

(7)

(3)

(4)

(6)

AC-00900

AC-00899

(5)

AC(diag)-8

HVAC SYSTEM (AUTO A/C) (DIAGNOSTICS)

Auto A/C Control Module I/O Signal

4. Auto A/C Control Module I/O Signal

A: ELECTRICAL SPECIFICATION

Terminal No.

Remarks

Measuring conditions

Specification

A1

Battery power supply

Ignition switch: OFF

Battery voltage

A2

ACC power supply

Ignition switch: ACC

Battery voltage

A3

Mode door actuator position sig-
nal

Mode door: FACE position

4 V

Mode door: DEF position

1 V

A4

Air mix door actuator position sig-
nal

Air mix door: Maximum cool position

4 V

Air mix door: Maximum hot position

1 V

A5

In-vehicle sensor

Ignition switch: ON

Less than 5 V

A6

Sunload sensor

Ignition switch: ON, With sunload (No sunload: 0 V)

3 V

A8

Sensor power supply

Ignition switch: ON

5 V

A9

Ignition power supply

Ignition switch: ON

Battery voltage

A10

A/C cut signal

Ignition switch: ON

Battery voltage

When operating pressure SW

0 V

A13

Evaporator center

Ignition switch: ON

Less than 5 V

A14, A16

Ground

Continuity to chassis ground

0 

Ω

A15

Sensor ground

Continuity to chassis ground

0 

Ω

B1, B11

Ambient sensor, engine coolant 
temperature sensor

—

*1

B2

Blower motor control

Ignition switch : ON, Blower switch : ON

0.45 V

B3

Blower motor control

Ignition switch : ON, Blower switch : ON

9.05 V

B4

RAM monitor

—

*1

B5

RAM monitor

—

*1

B6

A/C ON signal

A/C ON (A/C OFF: 0 V)

7 — 14 V

B7

Mode door actuator power supply

When switching mode door from DEF 

→ FACE

Battery voltage

B17

When switching mode door from FACE 

→ DEF

Battery voltage

B8

Air mix door actuator power sup-
ply

When switching air mix door from HOT 

→ COOL

Battery voltage

B18

When switching air mix door from COOL 

→ HOT

Battery voltage

B10

Intake door actuator

FRESH (RECIRC: Battery voltage)

0 V

B20

RECIRC (FRESH: Battery voltage)

0 V

B13

Blower fan ON signal

When blower fan is rotating (Not rotating: Battery volt-
age)

0 V

B14

RAM monitor

—

*1

AC-00735

10

20 19 18 17 16 15 14 13 12 11

9

8

7

6

5

4

3

2

1

10

16 15 14 13 12 11

9

8

7

6

5

4

3

2

1

To  B:  B283  

To  A:  B282