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 Conditioner" is not displayed on "Bus Check".


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

  • Power source or inside air conditioning amplifier assembly

  • Air conditioning amplifier assembly branch wire or connector

  • Air conditioning amplifier assembly

WIRING DIAGRAM

A00E9WNE43

INSPECTION PROCEDURE

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. DISCONNECT CABLE FROM NEGATIVE BATTERY TERMINAL


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

      CAUTION:

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

      Note


      • w/ Navigation System (for HDD):

        After the ignition switch is turned off, the HDD navigation system requires approximately a minute to record various types of memory and settings. As a result, after turning the ignition switch off, wait a minute or more before disconnecting the cable from the negative (-) battery terminal.

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


    NEXT

  2. CHECK FOR OPEN IN CAN BUS WIRE (AIR CONDITIONING AMPLIFIER BRANCH WIRE)


    1. A00E8YZE01
      Text in Illustration
      *1 for Automatic Air Conditioning System
      *2 for Manual Air Conditioning System and w/o Air Conditioning System
      *3

      Front 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

    REPAIR OR REPLACE AIR CONDITIONING AMPLIFIER BRANCH WIRE OR CONNECTOR (CANH, CANL)

    OK

  3. CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER - BATTERY AND BODY GROUND)


    1. 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. A00E8YZE03
      Text in Illustration
      *1 for Automatic Air Conditioning System
      *2 for Manual Air Conditioning System and w/o Air Conditioning System
      *3

      Front 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

    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

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

      Standard Voltage
      for Automatic Air Conditioning System
      Tester Connection Switch 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 Switch 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

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here