AIR CONDITIONING SYSTEM Air Conditioning Control Panel Circuit

DESCRIPTION

The radio receiver assembly switch signals are sent to the air conditioning amplifier assembly via CAN communication.

WIRING DIAGRAM


  1. for Navigation Receiver Type

    A0009PCE12

  2. for Radio and Display Type

    A000987E05

CAUTION / NOTICE / HINT

Note

Inspect the fuses for circuits related to this system before performing the following inspection procedure.

PROCEDURE


  1. CHECK CAN COMMUNICATION SYSTEM


    1. Use the GTS to check if the CAN communication system is functioning normally.

      Result
      Result Proceed to
      CAN DTCs are not output A
      CAN DTCs are output (w/ Central Gateway ECU) B
      CAN DTCs are output (w/o Central Gateway ECU) C

    B

    GO TO CAN COMMUNICATION SYSTEM Click here

    C

    GO TO CAN COMMUNICATION SYSTEM Click here

    A

  2. CHECK AVC-LAN COMMUNICATION CIRCUIT


    1. Check for an open or short in all AVC-LAN communication circuits


      OK
      There is no open or short circuit.

    NG

    REPAIR AVC-LAN COMMUNICATION CIRCUIT

    OK

  3. CHECK HARNESS AND CONNECTOR (POWER SOURCE, GROUND)


    1. Disconnect the H97 radio receiver assembly connector.*1

    2. Disconnect the H179 and H176 radio receiver assembly connectors.*2

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      H97-15 (IG) - H97-12 (GND1)*1 Power switch off Below 1 V
      H97-15 (IG) - H97-12 (GND1)*1 Power switch on (IG) 11 to 14 V
      H97-16 (ACC1) - H97-12 (GND1)*1 Power switch off Below 1 V
      H97-16 (ACC1) - H97-12 (GND1)*1 Power switch on (ACC) 11 to 14 V
      H97-17 (+B1) - H97-12 (GND1)*1 Power switch off 11 to 14 V
      H176-1 (IG) - H179-7 (GND1)*2 Power switch off Below 1 V
      H176-1 (IG) - H179-7 (GND1)*2 Power switch on (IG) 11 to 14 V
      H179-3 (ACC1) - H179-7 (GND1)*2 Power switch off Below 1 V
      H179-3 (ACC1) - H179-7 (GND1)*2 Power switch on (ACC) Below 1 V
      H179-4 (+B1) - H179-7 (GND1)*2 Power switch off Below 1 V

      • *1: for Navigation Receiver Type

      • *2: for Radio and Display Type

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      H97-12 (GND1) - Body ground*1 Always Below 1 Ω
      H179-7 (GND1) - Body ground*2 Always Below 1 Ω

      • *1: for Navigation Receiver Type

      • *2: for Radio and Display Type


    OK

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

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR