Subaru Outback manuals

Subaru Outback: Basic Diagnostic Procedure

A: PROCEDURE

NOTE: When the sunload sensor check is performed indoors or in the shade, it could be diagnosed as sensor having an open circuit. Always perform the inspection in direct sunlight.

Subaru Outback. HVAC System (Diagnostics)

General Description

A: CAUTION

1) Never connect the battery in reverse polarity.

2) Do not disconnect the battery terminals while the engine is running.

3) Before disconnecting the connectors of sensors and the A/C CM, be sure to turn off the ignition switch.

4) Every A/C-related part is a precision part. Do not drop them.

5) Airbag system wiring harness is routed near the A/C control panel and junction box.

CAUTION:

B: INSPECTION

Before performing the diagnosis, check the following items which may cause problems in the A/C system.

1. BATTERY

Check the battery. <Ref. to SC(H4SO)-28, INSPECTION, Battery.>

NOTE: If the battery voltage does not reach the specified value, recharge or replace the battery.

C: PREPARATION TOOL

1. SPECIAL TOOL

Subaru Outback. HVAC System (Diagnostics)

2. GENERAL TOOL

Subaru Outback. HVAC System (Diagnostics)

Electrical Component Location

A: LOCATION

1. ENGINE COMPARTMENT

Subaru Outback. HVAC System (Diagnostics)

  1. A/C compressor
  2. A/C relay
  3. Pressure sensor
  4. Ambient sensor

Subaru Outback. HVAC System (Diagnostics)

2. COMPARTMENT

Subaru Outback. HVAC System (Diagnostics)

  1. Evaporator sensor
  2. Air mix door actuator*1 or air mix door actuator (driver's seat)*2
  3. A/C CM
  4. Blower motor
  5. Sunload sensor
  6. Intake door actuator
  7. Mode door actuator
  8. In-vehicle sensor
  9. A/C control panel
  10. Air mix door actuator (passenger's seat)*2

*1: Manual A/C
*2: Auto A/C

Subaru Outback. HVAC System (Diagnostics)

Control Module I/O Signal

A: ELECTRICAL SPECIFICATION

Subaru Outback. HVAC System (Diagnostics)

Subaru Outback. HVAC System (Diagnostics)

Subaru Outback. HVAC System (Diagnostics)

*1: Battery voltage cannot be measured because of digital signal.
*2: Manual A/C
*3: Auto A/C

B: WIRING DIAGRAM

<Ref. to WI-53, WIRING DIAGRAM, Air Conditioning System.>

Diagnostic Chart for Self-Diagnosis

A: OPERATION

Subaru Outback. HVAC System (Diagnostics)

  1. Defroster switch
  2. Rear window defogger switch
  3. Mode change switch
  4. A/C switch
  5. FAN switch
  6. OFF switch
  7. FRESH/RECIRC switch
  8. Temperature control switch (for driver's seat)
  9. Temperature control switch (for passenger's seat)
  10. AUTO switch
  11. DUAL switch

1. A/C CONTROL SYSTEM SELF-DIAGNOSIS

Subaru Outback. HVAC System (Diagnostics)

2. SENSOR CHECK TABLE

NOTE:

Subaru Outback. HVAC System (Diagnostics)

Subaru Outback. HVAC System (Diagnostics)

Subaru Outback. HVAC System (Diagnostics)

*1: Displays current malfunction only.

3. OPERATING MODE TABLE

Subaru Outback. HVAC System (Diagnostics)

4. DIAGNOSTIC PROCEDURE WHEN SELF DIAGNOSIS USING A/C CONTROL PANEL DOES NOT OPERATE

NOTE: For diagnostic procedure, refer to "Nothing is displayed on the screen or indicators do not illuminate." in Diagnostics with Phenomenon. <Ref. to AC(diag)-14, NOTHING IS DISPLAYED ON THE SCREEN OR INDICATORS DO NOT ILLUMINATE., DIAGNOSTIC PROCEDURE WITH PHENOMENON, Diagnostics with Phenomenon.>

Diagnostics with Phenomenon

A: INSPECTION

1. Perform diagnosis according to the diagnosis procedure for the corresponding symptom listed in the symptom table.

2. If there are multiple symptoms, perform the diagnosis in the order of symptom number (1 → 2 →... → 13).

1. SYMPTOM TABLE

Subaru Outback. HVAC System (Diagnostics)

B: DIAGNOSTIC PROCEDURE WITH PHENOMENON

1. NOTHING IS DISPLAYED ON THE SCREEN OR INDICATORS DO NOT ILLUMINATE.

TROUBLE SYMPTOM:

Trouble causes:

WIRING DIAGRAM:

Subaru Outback. HVAC System (Diagnostics)

Subaru Outback. HVAC System (Diagnostics)

Subaru Outback. HVAC System (Diagnostics)

Subaru Outback. HVAC System (Diagnostics)

Subaru Outback. HVAC System (Diagnostics)

2. AIR CONDITIONER DOES NOT STOP EVEN WHEN THE OFF SWITCH IS PRESSED. (VEHICLES WITH FULLY AUTOMATIC AIR CONDITIONER)

TROUBLE SYMPTOM:

Even when the OFF switch is pressed, the blower fan does not turn off, the inlet opening remains in FRESH mode, and the compressor does not turn off.

Trouble causes:

Subaru Outback. HVAC System (Diagnostics)

Subaru Outback. HVAC System (Diagnostics)

3. THE WINDSHIELD GLASS IS NOT CLEARED EVEN WHEN THE DEF SWITCH IS PRESSED. (VEHICLES WITH FULLY AUTOMATIC AIR CONDITIONER)

TROUBLE SYMPTOM:

Even when the DEF switch is pressed, the defroster indicator does not illuminate, the outlet opening is not set to DEF, the compressor does not turn on and the outlet opening is not set to FRESH.

Trouble causes:

Subaru Outback. HVAC System (Diagnostics)

Subaru Outback. HVAC System (Diagnostics)

4. COLD AIR NOT EMITTED

TROUBLE SYMPTOM:

Cold air not emitted.

Trouble causes:

Subaru Outback. HVAC System (Diagnostics)

Subaru Outback. HVAC System (Diagnostics)

Subaru Outback. HVAC System (Diagnostics)

5. WARM AIR NOT EMITTED

TROUBLE SYMPTOM:

Warm air not emitted.

Trouble causes:

Subaru Outback. HVAC System (Diagnostics)

Subaru Outback. HVAC System (Diagnostics)

Subaru Outback. HVAC System (Diagnostics)

6. COMPARTMENT TEMPERATURE IS EXCESSIVELY LOWER THAN SETTING TEMPERATURE

TROUBLE SYMPTOM:

Compartment temperature is excessively lower than setting temperature.

Trouble causes:

Subaru Outback. HVAC System (Diagnostics)

Subaru Outback. HVAC System (Diagnostics)

7. COMPARTMENT TEMPERATURE IS EXCESSIVELY HIGHER THAN SETTING TEMPERATURE

TROUBLE SYMPTOM:

Compartment temperature is excessively higher than setting temperature.

Trouble causes:

Subaru Outback. HVAC System (Diagnostics)

Subaru Outback. HVAC System (Diagnostics)

Subaru Outback. HVAC System (Diagnostics)

8. AIR DOES NOT COME OUT, OR AIRFLOW CAPACITY IS INSUFFICIENT

TROUBLE SYMPTOM:

Trouble causes:

Auto A/C

WIRING DIAGRAM:

Subaru Outback. HVAC System (Diagnostics)

Subaru Outback. HVAC System (Diagnostics)

Subaru Outback. HVAC System (Diagnostics)

Manual A/C

WIRING DIAGRAM:

Subaru Outback. HVAC System (Diagnostics)

Subaru Outback. HVAC System (Diagnostics)

9. AIR GOES OUT OF CONTROL

TROUBLE SYMPTOM:

Trouble causes:

Auto A/C

WIRING DIAGRAM:

Subaru Outback. HVAC System (Diagnostics)

Subaru Outback. HVAC System (Diagnostics)

Manual A/C

WIRING DIAGRAM:

Subaru Outback. HVAC System (Diagnostics)

10.COLD AIR DOES NOT COME OUT EVEN WHEN THE A/C SWITCH IS PRESSED. THE GLASS CANNOT BE DEFOGGED. (COMPRESSOR DOES NOT OPERATE. (VARIABLE) )

TROUBLE SYMPTOM:

Compressor does not operate even when the A/C switch is turned on and the fan switch is set to LO - HI.

Trouble causes:

Compressor failure

WIRING DIAGRAM:

Subaru Outback. HVAC System (Diagnostics)

Subaru Outback. HVAC System (Diagnostics)

11.UNABLE TO SWITCH SUCTION VENTS

TROUBLE SYMPTOM:

Even when the FRESH/RECIRC switch is pressed, the inlet opening does not switch to RECIRC → FRESH or FRESH → RECIRC.

Trouble causes:

Intake door actuator failure

WIRING DIAGRAM:

Subaru Outback. HVAC System (Diagnostics)

Subaru Outback. HVAC System (Diagnostics)

Subaru Outback. HVAC System (Diagnostics)

12.UNABLE TO SWITCH VENTS

TROUBLE SYMPTOM:

Unable to switch blow vents.

Trouble causes:

Mode door actuator failure

Subaru Outback. HVAC System (Diagnostics)

13.ILLUMINATION DOES NOT COME ON OR CANNOT DIM

TROUBLE SYMPTOM:

Even when the lighting switch is operated, the illumination does not come on. Even when the illumination control is operated, the illumination does not dim.

TROUBLE SYMPTOM:

Open circuit in illumination circuit

WIRING DIAGRAM:

Subaru Outback. HVAC System (Diagnostics)

Subaru Outback. HVAC System (Diagnostics)

Diagnostic Procedure for Sensors

A: AMBIENT SENSOR

TROUBLE SYMPTOM:

Trouble causes:

WIRING DIAGRAM:

Subaru Outback. HVAC System (Diagnostics)

Subaru Outback. HVAC System (Diagnostics)

Subaru Outback. HVAC System (Diagnostics)

Subaru Select Monitor

A: OPERATION

For details of basic operations, refer to "PC application help for Subaru Select Monitor".

NOTE: When initialization communication using Select Monitor is impossible, perform diagnosis according to "Diagnostic Procedure Used When Abnormal Communication with Subaru Select Monitor Occurs".

Read Diagnostic Trouble Code (DTC)

A: OPERATION

For details concerning the operation procedure, refer to "PC application help for Subaru Select Monitor".

Clear Memory Mode

A: OPERATION

For details concerning the operation procedure, refer to "PC application help for Subaru Select Monitor".

Read Current Data

A: OPERATION

For details concerning the operation procedure, refer to "PC application help for Subaru Select Monitor".

B: LIST

Subaru Outback. HVAC System (Diagnostics)

Subaru Outback. HVAC System (Diagnostics)

NOTE: For detailed operation procedures, refer to "PC application help for Subaru Select Monitor".

Diagnostic Procedure for Subaru Select Monitor Communication

A: COMMUNICATION FOR INITIALIZING IMPOSSIBLE

DIAGNOSIS:

Defective CAN communication circuit

TROUBLE SYMPTOM:

WIRING DIAGRAM:

Subaru Outback. HVAC System (Diagnostics)

Subaru Outback. HVAC System (Diagnostics)

Subaru Outback. HVAC System (Diagnostics)

READ NEXT:

 List of Diagnostic Trouble Code (DTC)

A: LIST NOTE: When the sunload sensor check is performed indoors or in the shade, it could be diagnosed as having an open circuit. Always check the sunload sensor in direct sunlight. NOTE: *1: When

 Airbag System

 General Description

A: COMPONENT Front sub sensor RH Front sub sensor LH Airbag warning light (in combination meter) Airbag module ASSY (driver) Airbag module ASSY (passenger) Airbag control module Steering rol

SEE MORE:

 Brake Booster

A: REMOVAL CAUTION: Do not allow brake fluid to come in contact with the painted surface of the vehicle body. If it does, wash off with water and wipe away completely. 1) Disconnect the ground cable from battery. 2) Drain brake fluid from the reservoir tank completely. 3) Remove the master cylind

 Bulb chart

NOTE Lights A and B are the LED (Light Emitting Diode) type. Consult your SUBARU dealer for replacement. WARNING Bulbs may become very hot while illuminated. Before replacing bulbs, turn off the lights and wait until the bulbs cool down. Otherwise, there is the risk of sustaining a bu

© 2010-2022 Copyright www.suoutback.com