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 there is a difference in temperature between the left and right air outlet while dual mode is ON, the following causes are possible.

Malfunction Status Factor
There is a difference in temperature between the left and right air outlet (while cooling operation)

  • Cooler compressor assembly malfunction

  • Lack of refrigerant

  • Damper and link operation (jamming)

  • Automatic light controlsensor malfunction
There is a difference in temperature between the left and right air outlet (while heater operation)

  • Heate accessory assembly malfunction (low water)

  • Damper and link operation (jamming)

  • Heater core closed waterway

WIRING DIAGRAM

B004C7OE07
*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.

    Click here

  • Before replacing the main body ECU (multiplex network body ECU), refer to Service Bulletin.

PROCEDURE


  1. CHECK MALFUNCTION STATUS

    Result
    Result Proceed to
    While cooling A
    While heater B

    B

    PERFORM AIR OMMISION OF COOLANT Click here

    A

  2. CHECK REFRIGERANT SHORTAGE


    1. Prepare the vehicle according to the table below.

      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.

    2. Connect the GTS to the DLC3.

    3. Turn the power switch on (READY).

    4. Turn the GTS on.

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


      Body Electrical > Air Conditioner > Utility
      Tester Display
      Refrigerant Gas Volume Check
      Result
      Result Amount of Refrigerant
      Refrigerant shortage Insufficient or leakage
      Refrigerant correct Correct
      OK
      "Refrigerant correct" is displayed on GTS.
      Result
      Proceed to
      OK
      NG

    NG

    CHARGE SYSTEM WITH REFRIGERANT for HFC-134a (R134a): Click here for HFO-1234yf (R1234yf): Click here

    OK

  3. PERFORM ACTIVE TEST USING GTS (SERVO PULSE)


    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the GTS on.

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

    5. Check the operation by referring to the table below.


      Body Electrical > Air Conditioner > Active Test
      Tester Display Measurement Item Control Range Diagnostic Note
      Air Mix Servo Targ Pulse(D)

        for LHD:

      • No. 1 air conditioning radiator damper servo sub-assembly (driver side upper air mix) operation


        for RHD:

      • No. 4 air conditioning radiator damper servo sub-assembly (driver side upper air mix) operation

      Min.: 128

      Max.: 383

      		 Operates between 186 and 258 pulses
      Air Mix Servo Targ Pulse(P) No. 2 air conditioning radiator damper servo sub-assembly (front passenger side upper air mix) operation

      Min.: 128

      Max.: 383

      		 Operates between 154 and 258 pulses

      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)
      OK
      Damper servo motor is operated.
      Result
      Proceed to
      OK
      NG

    NG

    GO TO DTC OF APPLICABLE SERVO MOTOR OPERATING ABNORMALLY Click here

    OK

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


    1. Disconnect the Q3 automatic light control sensor connector.

    2. Disconnect the P7 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
      Q3-1 (CLTB) - P7-23 (CLTB) Always Below 1 Ω
      Q3-2 (CLTE) - P7-25 (CLTE) Always Below 1 Ω
      Q3-4 (CLTS) - P7-24 (CLTS) Always Below 1 Ω
      Q3-1 (CLTB) or P7-23 (CLTB) - Other terminals and body ground Always 10 kΩ or higher
      Q3-2 (CLTE) or P7-25 (CLTE) - Other terminals and body ground Always 10 kΩ or higher
      Q3-4 (CLTS) or P7-24 (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

    GO TO ON-VEHICLE INSPECTION Click here

    NG

    REPLACE AUTOMATIC LIGHT CONTROL SENSOR Click here

  6. PERFORM AIR OMMISION OF COOLANT

    Click here

    Result
    Proceed to
    NEXT

    NEXT

  7. CHECK OPERATION (AIR CONDITIONING SYSTEM)


    1. Check that there is not a difference in temperature between the left and right air outlet.

      OK
      There is not a difference in temperature between the left and right air outlet.
      Result
      Proceed to
      OK
      NG

    OK

    END (FAILURE DUE TO AIR ENTERING COOLANT)

    NG

  8. PERFORM ACTIVE TEST USING GTS (SERVO PULSE)


    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the GTS on.

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

    5. Check the operation by referring to the table below.


      Body Electrical > Air Conditioner > Active Test
      Tester Display Measurement Item Control Range Diagnostic Note
      Air Mix Servo Targ Pulse(D)

        for LHD:

      • No. 1 air conditioning radiator damper servo sub-assembly (driver side upper air mix) operation


        for RHD:

      • No. 4 air conditioning radiator damper servo sub-assembly (driver side upper air mix) operation

      Min.: 128

      Max.: 383

      		 Operates between 186 and 258 pulses
      Air Mix Servo Targ Pulse(P) No. 2 air conditioning radiator damper servo sub-asembly (front passenger side upper air mix) operation

      Min.: 128

      Max.: 383

      		 Operates between 154 and 258 pulses

      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)
      OK
      Damper servo motor is operated.
      Result
      Proceed to
      OK
      NG

    NG

    GO TO DIAGNOSTIC TROUBLE CODE CHART (FOR SERVO MOTOR OF APPLICABLE ABNORMAL OPERATION) Click here

    OK

  9. INSPECT HEATER ACCESSORY ASSEMBLY


    1. Remove the heater accessory assembly.

      Click here

    2. Inspect the heater accessory assembly.

      Click here

      Result
      Proceed to
      OK
      NG

    OK

    REPLACE HEATER RADIATOR UNIT SUB-ASSEMBLY Click here

    NG

    GO TO HEATER WARTER PUMP CIRCUIT Click here