AIR CONDITIONING SYSTEM (for Automatic Air Conditioning System) Heater Control Switch Circuit

DESCRIPTION

The temperature control switch assembly LH and RH sends the temperature up and down signal to the air conditioning amplifier assembly through the multi-display assembly*1 or the air conditioning control assembly*2.


WIRING DIAGRAM

A015B25E03
A015B7RE05

INSPECTION PROCEDURE

PROCEDURE


  1. CHECK VEHICLE TYPE


    1. Check if the vehicle is equipped with the navigation system.

      Result
      Result Proceed to
      w/ Navigation System A
      w/o Navigation System B

    B

    CHECK LIN COMMUNICATION SYSTEM Click here

    A

  2. CHECK CAN COMMUNICATION SYSTEM


    1. Check the CAN communication system.

      OK
      CAN communication system has no problem.
      Result
      Result Proceed to
      OK A
      NG (for LHD) B
      NG (for RHD) C

    B

    GO TO CAN COMMUNICATION SYSTEM Click here

    C

    GO TO CAN COMMUNICATION SYSTEM Click here

    A

  3. CHECK OPERATION


    1. Check that the temperature control switches operate.

      Result
      Result Proceed to
      Temperature control switch LH does not operate A
      Temperature control switch RH does not operate B
      Temperature control switch LH and RH do not operate C

    B

    INSPECT TEMPERATURE CONTROL SWITCH ASSEMBLY RH Click here

    C

    CHECK MULTI-DISPLAY ASSEMBLY Click here

    A

  4. INSPECT TEMPERATURE CONTROL SWITCH ASSEMBLY LH


    1. A0158ZIE01
      Text in Illustration
      *1

      Component without harness connected

      (Temperature Control Switch Assembly LH)

      Remove the temperature control switch assembly LH Click here.

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      3 (UP) - 4 (SE) UP switch pressed Below 1 Ω
      UP switch not pressed 10 kΩ or higher
      5 (DOWN) - 4 (SE) DOWN switch pressed Below 1 Ω
      DOWN switch not pressed 10 kΩ or higher

    NG

    REPLACE TEMPERATURE CONTROL SWITCH ASSEMBLY LH Click here

    OK

  5. CHECK HARNESS AND CONNECTOR (TEMPERATURE CONTROL SWITCH ASSEMBLY LH - MULTI-DISPLAY ASSEMBLY)


    1. Disconnect the F16 temperature control switch assembly LH connector.

    2. Disconnect the F90 multi-display assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      F16-3 (UP) - F90-2 (TEC+) Always Below 1 Ω
      F16-5 (DOWN) - F90-7 (TEC-) Always Below 1 Ω
      F16-4 (SE) - F90-6 (AGND) Always Below 1 Ω
      F16-3 (UP) - Body ground Always 10 kΩ or higher
      F16-5 (DOWN) - Body ground Always 10 kΩ or higher
      F16-4 (SE) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE MULTI-DISPLAY ASSEMBLY Click here

  6. INSPECT TEMPERATURE CONTROL SWITCH ASSEMBLY RH


    1. A0158ZIE02
      Text in Illustration
      *1

      Component without harness connected

      (Temperature Control Switch Assembly RH)

      Remove the temperature control switch assembly RH Click here.

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      5 (UP) - 4 (SE) UP switch pressed Below 1 Ω
      UP switch not pressed 10 kΩ or higher
      3 (DOWN) - 4 (SE) DOWN switch pressed Below 1 Ω
      DOWN switch not pressed 10 kΩ or higher

    NG

    REPLACE TEMPERATURE CONTROL SWITCH ASSEMBLY RH Click here

    OK

  7. CHECK HARNESS AND CONNECTOR (TEMPERATURE CONTROL SWITCH ASSEMBLY RH - MULTI-DISPLAY ASSEMBLY)


    1. Disconnect the F17 temperature control switch assembly RH connector.

    2. Disconnect the F90 multi-display assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      F17-5 (UP) - F90-3 (TES+) Always Below 1 Ω
      F17-3 (DOWN) - F90-8 (TES-) Always Below 1 Ω
      F17-4 (SE) - F90-9 (BGND) Always Below 1 Ω
      F17-5 (UP) - Body ground Always 10 kΩ or higher
      F17-3 (DOWN) - Body ground Always 10 kΩ or higher
      F17-4 (SE) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE MULTI-DISPLAY ASSEMBLY Click here

  8. CHECK MULTI-DISPLAY ASSEMBLY


    1. Replace the multi-display assembly with a new or normally functioning one Click here.

    2. Check that the temperature control with temperature control switch LH and RH.

      OK
      Temperature control with temperature control switch LH and RH.

    NG

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE Click here

    OK

    END (MULTI-DISPLAY ASSEMBLY IS DEFECTIVE)

  9. CHECK LIN COMMUNICATION SYSTEM


    1. Check the LIN communication system.

      OK
      LIN communication system has no problem.

    NG

    GO TO LIN COMMUNICATION SYSTEM Click here

    OK

  10. CHECK OPERATION


    1. Check that the temperature control switches operate.

      Result
      Result Proceed to
      Temperature control switch LH does not operate A
      Temperature control switch RH does not operate B
      Temperature control switch LH and RH do not operate C

    B

    INSPECT TEMPERATURE CONTROL SWITCH ASSEMBLY RH Click here

    C

    CHECK AIR CONDITIONING CONTROL ASSEMBLY Click here

    A

  11. INSPECT TEMPERATURE CONTROL SWITCH ASSEMBLY LH


    1. A0158ZIE01
      Text in Illustration
      *1

      Component without harness connected

      (Temperature Control Switch Assembly LH)

      Remove the temperature control switch assembly LH Click here.

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      3 (UP) - 4 (SE) UP switch pressed Below 1 Ω
      UP switch not pressed 10 kΩ or higher
      5 (DOWN) - 4 (SE) DOWN switch pressed Below 1 Ω
      DOWN switch not pressed 10 kΩ or higher

    NG

    REPLACE TEMPERATURE CONTROL SWITCH ASSEMBLY LH Click here

    OK

  12. CHECK HARNESS AND CONNECTOR (TEMPERATURE CONTROL SWITCH ASSEMBLY LH - AIR CONDITIONING CONTROL ASSEMBLY)


    1. Disconnect the F16 temperature control switch assembly LH connector.

    2. Disconnect the F10 air conditioning control assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      F16-3 (UP) - F10-12 (DTP+) Always Below 1 Ω
      F16-5 (DOWN) - F10-11 (DTP-) Always Below 1 Ω
      F16-4 (SE) - F10-9 (S5) Always Below 1 Ω
      F16-3 (UP) - Body ground Always 10 kΩ or higher
      F16-5 (DOWN) - Body ground Always 10 kΩ or higher
      F16-4 (SE) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE AIR CONDITIONING CONTROL ASSEMBLY Click here

  13. INSPECT TEMPERATURE CONTROL SWITCH ASSEMBLY RH


    1. A0158ZIE03
      Text in Illustration
      *1

      Component without harness connected

      (Temperature Control Switch Assembly RH)

      Remove the temperature control switch assembly RH Click here.

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      5 (UP) - 4 (SE) UP switch pressed Below 1 Ω
      UP switch not pressed 10 kΩ or higher
      3 (DOWN) - 4 (SE) DOWN switch pressed Below 1 Ω
      DOWN switch not pressed 10 kΩ or higher

    NG

    REPLACE TEMPERATURE CONTROL SWITCH ASSEMBLY RH Click here

    OK

  14. CHECK HARNESS AND CONNECTOR (TEMPERATURE CONTROL SWITCH ASSEMBLY RH - AIR CONDITIONING CONTROL ASSEMBLY)


    1. Disconnect the F17 temperature control switch assembly RH connector.

    2. Disconnect the F10 air conditioning control assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      F17-5 (UP) - F10-10 (PTP+) Always Below 1 Ω
      F17-3 (DOWN) - F10-3 (PTP-) Always Below 1 Ω
      F17-4 (SE) - F10-2 (SG) Always Below 1 Ω
      F17-5 (UP) - Body ground Always 10 kΩ or higher
      F17-3 (DOWN) - Body ground Always 10 kΩ or higher
      F17-4 (SE) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE AIR CONDITIONING CONTROL ASSEMBLY Click here

  15. CHECK AIR CONDITIONING CONTROL ASSEMBLY


    1. Replace the air conditioning control assembly with a new or normally functioning one Click here.

    2. Check that the temperature control with temperature control switch LH and RH.

      OK
      Temperature control with temperature control switch LH and RH.

    NG

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here

    OK

    END (AIR CONDITIONING CONTROL ASSEMBLY IS DEFECTIVE)