AIR CONDITIONING SYSTEM Heater Water Pump Circuit

DESCRIPTION

The heater accessory assembly feeds engine coolant to the heater core assembly when the hybrid control system is stopped to prevent heating performance from decreasing. The air conditioning amplifier assembly sends the water pump ON request signal to the hybrid vehicle control ECU assembly via CAN communication system. Upon receiving the water pump ON request signal, the hybrid vehicle control ECU assembly activates the No. 1 semiconductor power integration control ECU to operate the heater accessory assembly in accordance with the command from the ECU assembly.

If warm air is not discharge (airflow volume control is normal), the following malfunctions are possible.

Symptom Factor

  • No heating at all (Airflow volume control is normal)

  • Air outlet temperature does not increase (Airflow volume control is normal)

  • Different temperature for left and right air outlets

  • Air conditioning amplifier assembly malfunction

  • No. 1 semiconductor power integration ECU malfunction

  • Heater accessory assembly malfunction

  • ECM malfunction

WIRING DIAGRAM

B006A5CE05

CAUTION / NOTICE / HINT

Note

Before replacing the main body ECU (multiplex network body ECU), refer to PRECAUTION.

Click here

PROCEDURE


  1. CHECK CAN COMMUNICATION SYSTEM


    1. Using the GTS, check if the CAN communication system is functioning normally.

      Click here

      OK
      CAN communication system DTCs are not output.
      Result
      Proceed to
      OK
      NG

    NG

    GO TO CAN COMMUNICATION SYSTEM Click here

    OK

  2. CHECK CXPI COMMUNICATION SYSTEM


    1. Using the GTS, check if the CXPI communication system is functioning normally.

      Click here

      OK
      CXPI communication system DTCs are not output.
      Result
      Proceed to
      OK
      NG

    NG

    GO TO CXPI COMMUNICATION SYSTEM Click here

    OK

  3. CHECK POWER INTEGRATION SYSTEM


    1. Using the GTS, check if the power integration system is functioning normally.

      Click here

      OK
      Power integration system DTCs are not output.
      Result
      Proceed to
      OK
      NG

    NG

    GO TO POWER INTEGRATION SYSTEM Click here

    OK

  4. CHECK HEATER ACCESSORY ASSEMBLY


    1. Disconnect the A96heater accessory assembly connector.

    2. Connect the GTS to the DLC3.

    3. Turn the engine switch on (IG).

    4. Turn the GTS on.

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

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


      Body Electrical > Air Conditioner > Active Test
      Tester Display Measurement Item Control Range Diagnostic Note
      Water Pump Heater accessory assembly ON/OFF

      • Engine switch on (IG)

      • Air conditioning system operating

      Body Electrical > Air Conditioner > Active Test
      Tester Display
      Water Pump

    7. Measure the voltage according to the value(s) in the table below.

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      A61-16 (L) - Body ground Perform Active Test and select "OFF" 11 to 14 V
      Perform Active Test and select "ON" Below 1 V
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here

    OK

  5. READ VALUE USING GTS (STATUS OF A/C WATER PUMP FUSE)


    1. Connect the GTS to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the GTS on.

    4. Enter the following menus: Body Electrical / Power Integration No.1 / Data List.

    5. Read the Data List according to the display on the GTS.


      Body Electrical > Power Integration No.1 > Data List
      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      Status of A/C Water Pump Fuse Heater accessory assembly fuse Connect or Disconnect

      Connect: Fuse not shut off

      Disconnect: Fuse shut off

      		 -

      Body Electrical > Power Integration No.1 > Data List
      Tester Display
      Status of A/C Water Pump Fuse
      OK
      The Data List value displays "Connect".
      Result
      Proceed to
      OK
      NG

    NG

    CHECK HEATER ACCESSORY ASSEMBLY Click here

    OK

  6. READ VALUE USING GTS (A/C WATER PUMP INPUT SIGNAL)


    1. Connect the GTS to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the GTS on.

    4. Enter the following menus: Body Electrical / Power Integration No.1 / Data List.

    5. Read the Data List according to the display on the GTS.


      Body Electrical > Power Integration No.1 > Data List
      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      A/C Water Pump Input Signal Heater accessory assembly input status OFF or ON

      OFF: Heater accessory assembly does not operate

      ON: Heater accessory assembly operates

      		 -

      Body Electrical > Power Integration No.1 > Data List
      Tester Display
      A/C Water Pump Input Signal
      OK
      Display changes according to heater accessory operation.
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) Click here

    OK

  7. READ VALUE USING GTS (A/C WATER PUMP OUTPUT SIGNAL)


    1. Connect the GTS to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the GTS on.

    4. Enter the following menus: Body Electrical / Power Integration No.1 / Data List.

    5. Read the Data List according to the display on the GTS.


      Body Electrical > Power Integration No.1 > Data List
      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      A/C Water Pump Output Signal Heater accessory assembly output status OFF or ON

      OFF: Heater accessory assembly does not operate

      ON: Heater accessory assembly operates

      		 -

      Body Electrical > Power Integration No.1 > Data List
      Tester Display
      A/C Water Pump Output Signal
      OK
      Display changes according to heater accessory operation.
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE NO. 1 SEMICONDUCTOR POWER INTEGRATION ECU Click here

    OK

  8. 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

    NG

    REPLACE HEATER ACCESSORY ASSEMBLY Click here

    OK

  9. CHECK HARNESS AND CONNECTOR (HEATER ACCESSORY ASSEMBLY - NO. 1 SEMICONDUCTOR POWER INTEGRATION ECU AND BODY GROUND)


    1. Disconnect the A96 heater accessory assembly connector.

    2. Disconnect the A61 No. 1 semiconductor power integration ECU connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A96-2 - A61-16 (L) Always Below 1 Ω
      A96-1 - Body ground Always Below 1 Ω
      A96-2 or A61-16 (L) - Other terminals and body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE NO. 1 SEMICONDUCTOR POWER INTEGRATION ECU Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  10. CHECK HEATER ACCESSORY ASSEMBLY


    1. Disconnect the A96 heater accessory connector.

    2. Connect the GTS to the DLC3.

    3. Turn the engine switch on (IG).

    4. Turn the GTS on.

    5. Enter the following menus: Body Electrical / Power Integration No.1 / Data List.

    6. Read the Data List according to the display on the GTS.


      Body Electrical > Power Integration No.1 > Data List
      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      Status of A/C Water Pump Fuse Heater accessory assembly fuse Connect or Disconnect

      Connect: Fuse not shut off

      Disconnect: Fuse shut off

      		 -

      Body Electrical > Power Integration No.1 > Data List
      Tester Display
      Status of A/C Water Pump Fuse
      OK
      The Data List value displays "Connect".
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE HEATER ACCESSORY ASSEMBLY Click here

    OK

  11. CHECK HARNESS AND CONNECTOR (HEATER ACCESSORY ASSEMBLY - NO. 1 SEMICONDUCTOR POWER INTEGRATION ECU)


    1. Disconnect the A96 heater water pump assembly connector.

    2. Disconnect the A61 No. 1 semiconductor power integration ECU connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A96-2 - A61-16 (L) Always Below 1 Ω
      A96-2 or A61-16 (L) - Other terminals and body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE NO. 1 SEMICONDUCTOR POWER INTEGRATION ECU Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR