AIR CONDITIONING SYSTEM(for Automatic Air Conditioning System) Air Vent Temperature does not Change and Right Vent is Different from Left and Vice Versa (Same Left/Right Temperature Setting)

DESCRIPTION

If the temperature of the air that blows from the left and right front registers differs, even though the same temperature is set for both sides, the following factors may be the cause.

Symptom Factor

Temperature of outlet air is cooler on left or right side


  • (when same temperature set for both sides)

  • Compressor assembly with pulley (compressor solenoid) malfunction*1

  • Cooler compressor assembly (compressor solenoid) malfunction*2

  • Magnet clutch assembly malfunction*2

  • Refrigerant volume (low)

  • Mechanical locking of damper and damper link

  • Automatic light control sensor malfunction

  • Harness or connector

Temperature of outlet air is warmer on left or right side


  • (when same temperature set for both sides)

  • Mechanical locking of damper and damper link

  • Blockage in heater radiator unit sub-assembly

  • Harness or connector

WIRING DIAGRAM

B0085HBE04
*a Air Conditioning Amplifier Assembly
*b Automatic Light Control Sensor
*c Main Body ECU (Multiplex Network Body ECU)
*d CAN Communication Line

CAUTION / NOTICE / HINT

Note


  • If DTC B1244 is output, troubleshoot for DTC B1244 first.

    w/ Automatic Headlight Beam Level Control System: Click here

    w/o Automatic Headlight Beam Level Control System: Click here

  • The air conditioning system uses the CAN communication system. Inspect the communication functions by following How to Proceed with Troubleshooting. Troubleshoot the air conditioning system after confirming that the communication systems are functioning properly.

    Click here

PROCEDURE


  1. CHECK WHEN MALFUNCTION OCCURS

    Result
    Result Proceed to
    When using cooling function A
    When using heater function B

    B

    BLEED AIR FROM COOLING SYSTEM Click here

    A

  2. PERFORM REFRIGERANT SHORTAGE CHECK


    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the GTS on.

    4. Enter the following menus: Body Electrical / Air Conditioner / Utility / Refrigerant Gas Volume Check.


      Body Electrical > Air Conditioner > Utility
      Tester Display
      Refrigerant Gas Volume Check

    5. Check that the following conditions are met and perform the refrigerant shortage check according to the display on the GTS.

      Measurement Condition:
      Item Condition
      A/C switch On
      Ambient temperature* 0 to 49°C (32 to 120°F)
      Blower speed HI

      *: If the ambient temperature is not within the range shown, do not perform this check.

      Result
      Result Amount of Refrigerant
      Refrigerant correct Correct
      Refrigerant shortage Insufficient
      OK
      "Refrigerant correct" is displayed on the GTS.
      Result
      Proceed to
      OK
      NG

    NG

    CHARGE SYSTEM WITH REFRIGERANT Click here

    OK

  3. PERFORM ACTIVE TEST USING GTS


    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the GTS on.

    4. Enter the following menus: Body Electrical / Air Conditioner / Active Test.

    5. Perform the Active Test according to the display on the GTS.


      Body Electrical > Air Conditioner > Active Test
      Tester Display Measurement Item Control Range Diagnostic Note
      Air Mix Servo Targ Pulse(D) No. 1 air conditioning radiator damper servo sub-assembly (driver side air mix) pulse

      Min.: 128

      Max.: 383

        for LHD:

      • Operates between 165 to 257 pulses


        for RHD:

      • Operates between 255 to 347 pulses
      Air Mix Servo Targ Pulse(P) No. 1 air conditioning radiator damper servo sub-assembly (front passenger side air mix) pulse

      Min.: 128

      Max.: 383

        for LHD:

      • Operates between 255 to 347 pulses


        for RHD:

      • Operates between 165 to 257 pulses
      Rear Air Mix Servo Targ Pulse No. 3 air conditioning radiator damper servo sub-assembly pulse

      Min.: 128

      Max.: 383

      • Operates between 165 to 257 pulses

      • *

      • *: for 3 Zone Type


      Body Electrical > Air Conditioner > Active Test
      Tester Display
      Air Mix Servo Targ Pulse(D)

      Body Electrical > Air Conditioner > Active Test
      Tester Display
      Air Mix Servo Targ Pulse(P)

      Body Electrical > Air Conditioner > Active Test
      Tester Display
      Rear Air Mix Servo Targ Pulse
      OK
      Each damper servo motor operates.
      Result
      Proceed to
      OK
      NG

    NG

    GO TO DTC TROUBLESHOOTING PROCEDURE FOR MALFUNCTIONING DAMPER SERVO MOTOR Click here

    OK

  4. CHECK HARNESS AND CONNECTOR (AUTOMATIC LIGHT CONTROL SENSOR - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU))


    1. Disconnect the M1 automatic light control sensor connector.

    2. Disconnect the K52 main body ECU (multiplex network body ECU) connector.

    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      M1-1 (CLTB) - K52-23 (CLTB) Always Below 1 Ω
      M1-2 (CLTE) - K52-25 (CLTE) Always Below 1 Ω
      M1-4 (CLTS) - K52-24 (CLTS) Always Below 1 Ω
      M1-1 (CLTB) or K52-23 (CLTB) - Other terminals and body ground Always 10 kΩ or higher
      M1-2 (CLTE) or K52-25 (CLTE) - Other terminals and body ground Always 10 kΩ or higher
      M1-4 (CLTS) or K52-24 (CLTS) - Other terminals and body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  5. INSPECT AUTOMATIC LIGHT CONTROL SENSOR


    1. Remove the automatic light control sensor.

      Click here

    2. Inspect the automatic light control sensor.

      Click here

      Result
      Proceed to
      OK
      NG

    OK

    INSPECT REFRIGERANT PRESSURE WITH MANIFOLD GAUGE SET Click here

    NG

    REPLACE AUTOMATIC LIGHT CONTROL SENSOR Click here

  6. BLEED AIR FROM COOLING SYSTEM


    1. Bleed air from cooling system.

      for 2AR-FE: Click here

      for A25A-FKS: Click here

      for 6AR-FSE: Click here

      for 2GR-FKS: Click here

      Result
      Proceed to
      NEXT

    NEXT

  7. CHECK OPERATION (AIR CONDITIONING SYSTEM)


    1. Set the same temperature for the left and right sides and check that the air that blows from the left and right front registers is the same temperature.

      OK
      The air from the left and right front registers is the same temperature.
      Result
      Proceed to
      OK
      NG

    OK

    END (MALFUNCTION DUE TO AIR IN COOLING SYSTEM)

    NG

  8. PERFORM ACTIVE TEST USING GTS


    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the GTS on.

    4. Enter the following menus: Body Electrical / Air Conditioner / Active Test.

    5. Perform the Active Test according to the display on the GTS.


      Body Electrical > Air Conditioner > Active Test
      Tester Display Measurement Item Control Range Diagnostic Note
      Air Mix Servo Targ Pulse(D) No. 1 air conditioning radiator damper servo sub-assembly (driver side air mix) pulse

      Min.: 128

      Max.: 383

        for LHD:

      • Operates between 165 to 257 pulses


        for RHD:

      • Operates between 255 to 347 pulses
      Air Mix Servo Targ Pulse(P) No. 1 air conditioning radiator damper servo sub-assembly (front passenger side air mix) pulse

      Min.: 128

      Max.: 383

        for LHD:

      • Operates between 255 to 347 pulses


        for RHD:

      • Operates between 165 to 257 pulses
      Rear Air Mix Servo Targ Pulse No. 3 air conditioning radiator damper servo sub-assembly pulse

      Min.: 128

      Max.: 383

      • Operates between 165 to 257 pulses

      • *

      • *: for 3 Zone Type


      Body Electrical > Air Conditioner > Active Test
      Tester Display
      Air Mix Servo Targ Pulse(D)

      Body Electrical > Air Conditioner > Active Test
      Tester Display
      Air Mix Servo Targ Pulse(P)

      Body Electrical > Air Conditioner > Active Test
      Tester Display
      Rear Air Mix Servo Targ Pulse
      OK
      Each damper servo motor operates.
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE HEATER RADIATOR UNIT SUB-ASSEMBLY Click here

    NG

    GO TO DTC TROUBLESHOOTING PROCEDURE FOR MALFUNCTIONING DAMPER SERVO MOTOR Click here