Electrical Specification

Fig 1: Identifying Control Module I/O Signal Connector Terminals

Courtesy of SUBARU OF AMERICA, INC.

Terminal No.

Description

Measuring condition

Standard

Battery power supply

Always

Battery voltage

Ignition power supply

Ignition switch: ON

Battery voltage

ACC power supply

Ignition switch: ACC

Battery voltage

CAN communication (Hi)

Digital signal; can not be measured

⁽¹⁾

CAN communication (Lo)

Digital signal; can not be measured

⁽¹⁾

Ground

Always

A/C control panel communication

Digital signal; can not be measured

⁽¹⁾

A11

In-vehicle sensor

Ignition switch: ON

25°C: Approx. 1.5 V
40°C: Approx. 1.0 V

A13

Flow sensor

Ignition switch: ON

0.3 - 4.7 V

A14

Air mix door position signal ⁽²⁾ or air mix door (driver's seat) position signal ⁽³⁾

Ignition switch: ON, Air mix door: maximum cool position

4 V

Ignition switch: ON, Air mix door: maximum hot position

1 V

A16

Each potentiometer and sensor power supply

Ignition switch: ON

5 V

A17

Rear vent actuator position signal⁽⁴⁾

Ignition switch: ON, Air mix door: maximum cool position

1.8 V

Ignition switch: ON, Air mix door: maximum hot position

4.1 V

A18

A/C control panel communication

Digital signal; can not be

measured ⁽¹⁾

A21

After-evaporator sensor signal

Ignition switch: ON, fluctuates depending on temperature after the evaporator.

1 - 4.5 V

A22

Pressure sensor

Ignition switch: ON

0.5 - 4.9 V

A24

Sunload sensor (with automatic light)⁽³⁾

Ignition switch: ON (0 V: No sunload)

0 - 4.9 V

A25

Air mix door actuator (passenger's seat) position signal⁽³⁾

Ignition switch: ON, Air mix door: maximum cool position

4 V

Ignition switch: ON, Air mix door: maximum hot position

1 V

A26

Mode door actuator position signal

Ignition switch: ON, Mode door: FACE position

4 V

Ignition switch: ON, Mode door: DEF position

1 V

Sensor GND

Always

Less than 0.5 V

Variable compressor solenoid valve

Ignition switch: ON, Blower switch: ON, A/C switch: ON

2 - 12 V

Intake door actuator drive signal (FRESH)

Intake door actuator operating on the FRESH side

0.7 V or less

Air mix door actuator (passenger's seat) drive signal (HOT)⁽³⁾

Turning towards HOT side: B4 is 12 V, B16 is GND

While operating: 12 V
While not operating: 0 V

B16

Air mix door actuator (passenger's seat) drive signal (COOL)⁽³⁾

Turning towards COOL side: B16 is 12 V, B4 is GND

Intake door actuator drive signal (RECIRC)

Intake door actuator operating on the RECIRC side

0.7 V or less

Blower motor voltage feedback⁽³⁾

Ignition switch: ON, Blower switch: ON

0.45 - 10 V

Blower motor control signal⁽³⁾

Ignition switch: ON, Blower switch: ON

9.05 V

B11

Mode servo drive signal (FACE)

When turning towards FACE side: B11 is 12 V, B13 is GND

While operating: 12 V
While not operating: 0 V

B13

Mode servo drive signal (DEF)

When turning towards DEF side: B13 is 12 V, B11 is GND

B20

Heater main relay drive signal⁽³⁾

Ignition switch: ON, Blower switch: ON

0.7 V or less

B21

Air mix door actuator drive signal (COOL)⁽²⁾ or air mix door actuator (driver's seat) drive signal (COOL)⁽³⁾

Turning towards COOL side: B21 is 12 V, B22 is GND

While operating: 12 V
While not operating: 0 V

B22

Air mix door actuator drive signal (HOT)⁽²⁾ or air mix door actuator (driver's seat) drive signal (HOT)⁽³⁾

Turning towards HOT side: B22 is 12 V, B21 is GND

B23

Rear vent actuator drive signal (HOT)⁽⁴⁾

Turning towards HOT side: B23 is 12 V, B24 is GND

While operating: 12 V
While not operating: 0 V

B24

Rear vent actuator drive signal (COOL)⁽⁴⁾

Turning towards COOL side: B24 is 12 V, B23 is GND

⁽¹⁾	Battery voltage cannot be measured because of digital signal.

⁽²⁾	Manual A/C

⁽³⁾

Auto A/C

⁽⁴⁾	With rear seat A/C