CAN COMMUNICATION SYSTEM Air Conditioning Amplifier Communication Stop Mode

DESCRIPTION

Detection Item Symptom Trouble Area
Air Conditioning Amplifier Communication Stop Mode

Either condition is met:


  • "Air Conditioning Amplifier" is not displayed on the "Bus Check" screen.

  • "Air Conditioning Amplifier Communication Stop Mode" in "DTC Communication Table" applies.


  • Power source or inside of air conditioning amplifier assembly

  • Air conditioning amplifier assembly CAN branch wire or connector

  • Air conditioning amplifier assembly


WIRING DIAGRAM

A004U6KE17

CAUTION / NOTICE / HINT

Note

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

Tech Tips

Operating the ignition switch, any switches or any doors triggers related ECU and sensor communication with the CAN, which causes resistance variation.

PROCEDURE


  1. PRECAUTION

    Note

    After turning the ignition switch off, waiting time may be required before disconnecting the cable from the battery terminal. Therefore, make sure to read the disconnecting the cable from the battery terminal notice before proceeding with work Click here.


    NEXT
  2. DISCONNECT CABLE FROM NEGATIVE BATTERY TERMINAL


    1. Disconnect the cable from the negative (-) battery terminal before measuring the resistances of the CAN main wire and the CAN branch wire.

      CAUTION:

      Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.

      Note

      When disconnecting the cable, some systems need to be initialized after the cable is reconnected Click here.


    NEXT
  3. CHECK FOR OPEN IN CAN BUS WIRE (AIR CONDITIONING AMPLIFIER ASSEMBLY CAN BRANCH WIRE)


    1. A004NV1E02
      Text in Illustration
      *A for Automatic Air Conditioning System
      *B for Manual Air Conditioning System and w/o Air Conditioning System
      *a

      Rear view of wire harness connector

      (to Air Conditioning Amplifier Assembly)

      Disconnect the D47*1 or D101*2 air conditioning amplifier assembly connector.


      • *1: for Automatic Air Conditioning System

      • *2: for Manual Air Conditioning System and w/o Air Conditioning System

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

      Standard Resistance
      for Automatic Air Conditioning System
      Tester Connection Switch Condition Specified Condition
      D47-11 (CANH) - D47-12 (CANL) Ignition switch off 54 to 69 Ω
      for Manual Air Conditioning System and w/o Air Conditioning System
      Tester Connection Switch Condition Specified Condition
      D101-11 (CANH) - D101-12 (CANL) Ignition switch off 54 to 69 Ω

    NG
    OK
  4. CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER ASSEMBLY - BATTERY AND BODY GROUND)


    1. A004PPCE02
      Text in Illustration
      *A for Automatic Air Conditioning System
      *B for Manual Air Conditioning System and w/o Air Conditioning System
      *a

      Rear view of wire harness connector

      (to Air Conditioning Amplifier Assembly)

      Connect the cable to the negative (-) battery terminal.

      Note

      When disconnecting the cable, some systems need to be initialized after the cable is reconnected Click here.

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

      Standard Voltage
      for Automatic Air Conditioning System
      Tester Connection Condition Specified Condition
      D47-21 (B) - Body ground Always 11 to 14 V
      D47-1 (IG+) - Body ground Ignition switch ON 11 to 14 V
      for Manual Air Conditioning System and w/o Air Conditioning System
      Tester Connection Condition Specified Condition
      D101-21 (B) - Body ground Always 11 to 14 V
      D101-1 (IG+) - Body ground Ignition switch ON 11 to 14 V
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      for Automatic Air Conditioning System
      Tester Connection Condition Specified Condition
      D47-14 (GND) - Body ground Always Below 1 Ω
      for Manual Air Conditioning System and w/o Air Conditioning System
      Tester Connection Condition Specified Condition
      D101-14 (GND) - Body ground Always Below 1 Ω

    OK
    NG