HVAC System (Auto AC) (Diagnostics) (Except Wrx): Other Subaru XV GP

PROCEDURE

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

CAUTION

1. Never connect the battery in reverse polarity. Doing so may immediately damage the A/C control panel.
2. Do not disconnect the battery terminals while the engine is running. A large counter electromotive force will be generated in the generator, and this voltage may damage electronic parts such as A/C control panel etc.
3. Before disconnecting the connectors of sensors and the A/C control panel, be sure to turn off the ignition switch. A/C control panel may be damaged.
4. Every A/C-related part is a precision part. Do not drop them.
5. Airbag system harness is routed near the A/C control panel and junction box. CAUTION: Do not use electrical test equipment on the airbag system harness and connector. Be careful not to damage the airbag system harness when servicing the A/C control panel and junction box.

BATTERY

Check the battery. < Refer to INSPECTION , Battery. >

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

GENERAL TOOL

Scheme 53

Scheme 54

Scheme 55

AIR CONDITIONER AUTO A/C MODEL

< Refer to Air Conditioning System in the wiring diagram. > Refer to System Wiring Diagram Article.

Scheme 56

Scheme 57

Scheme 58

1. Without left/right independent air conditioning function (without high grade MFD)
2. Without left/right independent air conditioning function (with high grade MFD)
3. With left/right independent air conditioning function

SENSOR CHECK TABLE

1. Without left/right independent air conditioning function (without high grade MFD) 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 at a location exposed to direct sunlight. Past malfunction will illuminate if four malfunctions or more were detected previously. To cancel the past malfunction, perform either of the following procedure: Disconnect the negative battery terminal or press and hold the FRESH/RECIRC switch for 5 seconds or more while performing self-diagnosis step 3 - 7. Air flow control dial position Fan dial position Sensor to be checked No trouble Short circuit Open circuit When currently malfunctioning When having malfunctioned in the past AUTO AUTO In-vehicle sensor FRESH/RECIRC switch LED is turned off FRESH/RECIRC switch LED blinks (Illuminates for 0.2 sec. <----> turns off for 0.2 sec.) FRESH/RECIRC switch LED blinks (Illuminates for 1 sec.<----> turns off for 1 sec.) Rear window defogger switch LED is turned off Rear window defogger switch LED illuminates 1st Ambient sensor FRESH/RECIRC switch LED blinks (Illuminates for 0.2 sec. <----> turns off for 0.2 sec.) 2nd Evaporator sensor FRESH/RECIRC switch LED blinks (Illuminates for 0.2 sec. <----> turns off for 0.2 sec.) 3rd Engine coolant temperature sensor - 4th Sunload sensor FRESH/RECIRC switch LED blinks (Illuminates for 0.2 sec. <----> turns off for 0.2 sec.) 5th CAN communication - 6th FRESH/RECIRC potentiometer FRESH/RECIRC switch LED blinks (Illuminates for 0.2 sec. <----> turns off for 0.2 sec.)
2. Without left/right independent air conditioning function (with high grade MFD), with left/right independent air conditioning function 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 at a location exposed to direct sunlight. If there are multiple defective sensors, a malfunction is displayed in the sequence of priority (1, 2, 3, etc.). The display changes in the sequence of priority (1, 2, 3, etc.) each time the A/C switch is pressed. Past malfunction will illuminate if four malfunctions or more were detected previously.
3. To cancel the past malfunction, perform either of the following procedure: Disconnect the negative battery terminal or press and hold the FRESH/RECIRC switch for 5 seconds or more while performing self-diagnosis step 3 - 4. Sensor A/C switch indicator FRESH/RECIRC switch indicator Rear defroster switch indicator (2) Open Sequence of priority Short Sequence of priority Current malfunction Past malfunction In-vehicle sensor Once Light OFF 1 Light ON 2 Light OFF Light ON Ambient sensor Twice Light OFF 3 Light ON 4 Light OFF Light ON Evaporator sensor 3 times Light OFF 5 Light ON 6 Light OFF Light ON Engine coolant temperature sensor 4 times Light OFF 7 Light OFF Light ON Sunload sensor 5 times Light OFF (1) 8 Light ON 9 Light OFF Light ON CAN communication 6 times Light OFF 10 - Light OFF Light ON FRESH/RECIRC potentiometer 7 times Light OFF 11 Light ON 12 Light OFF Light ON (1) Displays current malfunction only (2) If the same diagnostic object contains a current malfunction and a past malfunction, the current malfunctions is displayed.

OPERATING MODE TABLE

1. Without left/right independent air conditioning function (without high grade MFD) Operation Fan dial position AUTO 1st 2nd 3rd 4th 5th 6th 7th Blower fan 4 V 4 V 4.9 V 5.9 V 7.0 V 8.3 V 9.8 V 14 V FRESH/RECIRC door RECIRC RECIRC MIX FRESH FRESH FRESH FRESH FRESH Air flow control door FACE FACE FACE B/L HEAT HEAT D/H DEF Air mix door 0% 0% 0% 50% 50% 100% 100% 100% A/C compressor OFF ON ON ON ON ON ON ON
2. Without left/right independent air conditioning function (with high grade MFD), with left/right independent air conditioning function Operation Number of blinking of A/C switch indicator Once Twice 3 times 4 times 5 times 6 times 7 times 8 times Blower fan 4 V 4 V 4.9 V 5.9 V 7.0 V 8.3 V 9.8 V 14 V FRESH/RECIRC door RECIRC RECIRC MIX FRESH FRESH FRESH FRESH FRESH Air flow control door FACE FACE FACE B/L HEAT HEAT D/H DEF Air mix door (1) or air mix door RH (2) 0% 0% 0% 50% 50% 100% 100% 100% Air mix door LH (2) 0% 0% 0% 50% 50% 100% 100% 100% A/C compressor OFF ON ON ON ON ON ON ON (1) Without left/right independent air conditioning function (2) With left/right independent air conditioning function

DRIVE SIGNAL CHECK TABLE

1. Without left/right independent air conditioning function (without high grade MFD) NOTE: Past malfunction will illuminate if four malfunctions or more were detected previously. To cancel the past malfunction, perform either of the following procedure: Disconnect the negative battery terminal or press and hold the FRESH/RECIRC switch for 5 seconds or more while performing self-diagnosis step 3 - 7. Air flow control dial position Fan dial position Drive signal to check A/C switch LED No trouble Short circuit Open circuit When currently malfunctioning When having malfunctioned in the past FACE AUTO MIX #1 Blinking (Illuminates for 0.2 sec. <----> turns off for 0.2 sec.) FRESH/RECIRC switch LED is turned off FRESH/RECIRC switch LED blinks (Illuminates for 0.2 sec. <----> turns off for 0.2 sec.) FRESH/RECIRC switch LED blinks (Illuminates for 1 sec. <----> turns off for 1 sec.) Rear window defogger switch LED is turned off Rear window defogger switch LED illuminates 1st MIX #2 2nd MIX #3 3rd MIX #4 4th to 7th Intake door actuator lock FRESH/RECIRC switch LED blinks (Illuminates for 1 sec. <----> turns off for 1 sec.) - AUTO MODE #1 Blinking (Illuminates for 1 sec. <----> turns off for 1 sec.) FRESH/RECIRC switch LED blinks (Illuminates for 0.2 sec. <----> turns off for 0.2 sec.) FRESH/RECIRC switch LED blinks (Illuminates for 1 sec. <----> turns off for 1 sec.) Rear window defogger switch LED is turned off 1st MODE #2 2nd MODE #3 3rd MODE #4 4th to 7th Intake door actuator lock FRESH/RECIRC switch LED blinks (Illuminates for 1 sec. <----> turns off for 1 sec.)
2. Without left/right independent air conditioning function (with high grade MFD), with left/right independent air conditioning function NOTE: If there are multiple defective sensors, a malfunction is displayed in the sequence of priority (1, 2, 3, etc.). The display changes in the sequence of priority (1, 2, 3, etc.) each time the A/C switch is pressed. Past malfunction will illuminate if four malfunctions or more were detected previously. To cancel the past malfunction, perform either of the following procedure: Disconnect the negative battery terminal or press and hold the FRESH/RECIRC switch for 5 seconds or more while performing self-diagnosis step 3 - 4. Drive signal Defroster indicator A/C switch indicator FRESH/RECIRC switch indicator Rear defogger switch indicator (3) Open Sequence of priority Short Sequence of priority Current malfunction Past malfunction Air mix door actuator (1) or air mix door actuator RH (2) #1 Once Once Light OFF 1 Light ON 2 Light OFF Light ON #2 Twice Light OFF 3 Light ON 4 Light OFF Light ON #3 3 times Light OFF 5 Light ON 6 Light OFF Light ON #4 4 times Light OFF 7 Light ON 8 Light OFF Light ON Air mix door actuator LH (2) #1 Twice Once Light OFF 9 Light ON 10 Light OFF Light ON #2 Twice Light OFF 11 Light ON 12 Light OFF Light ON #3 3 times Light OFF 13 Light ON 14 Light OFF Light ON #4 4 times Light OFF 15 Light ON 16 Light OFF Light ON Air flow control door actuator #1 3 times Once Light OFF 17 Light ON 18 Light OFF Light ON #2 Twice Light OFF 19 Light ON 20 Light OFF Light ON #3 3 times Light OFF 21 Light ON 22 Light OFF Light ON #4 4 times Light OFF 23 Light ON 24 Light OFF Light ON Intake door actuator 4 times Light ON Light ON - Light ON (1) Without left/right independent air conditioning function (2) With left/right independent air conditioning function (3) If the same diagnostic object contains a current malfunction and a past malfunction, the current malfunctions is displayed.

LIST

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