LIN COMMUNICATION SYSTEM Rear Heater Control Panel LIN Communication Malfunction

DESCRIPTION

The LIN communication of the components related to the rear air conditioning occurs between the air conditioning amplifier (A/C ECU), rear air conditioning control panel and front air conditioning control panel.

WIRING DIAGRAM

A015BHIE01
A0159PAE01

INSPECTION PROCEDURE

Note

When using the intelligent tester with the ignition switch off to troubleshoot:

Connect the intelligent tester to the vehicle, and turn a courtesy switch on and off at 1.5 second intervals until communication between the intelligent tester and vehicle begins.

PROCEDURE


  1. CHECK AIR CONDITIONING TYPE


    1. Check air conditioning type.

      Result
      Result Proceed to
      for 4-ZONE Type A
      except 4-ZONE Type B

    B

    CHECK HARNESS AND CONNECTOR (A/C ECU - FRONT AIR CONDITIONING CONTROL PANEL) Click here

    A

  2. CHECK HARNESS AND CONNECTOR (A/C ECU - REAR AIR CONDITIONING CONTROL PANEL AND FRONT AIR CONDITIONING CONTROL PANEL*)

    A0156FQE01

    Tech Tips

    *: w/o Navigation System


    1. Disconnect the E36 amplifier connector.

    2. Disconnect the F10* and E55 panel connector.

    3. Measure the resistance and voltage according to the value(s) in the tables below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      E36-21 (RLIN) - E55-4 (RLIN) Always Below 1 Ω
      E36-20 (LIN1) - F10-5 (LIN1)* Always Below 1 Ω
      E36-21 (RLIN) - Body ground Always 10 kΩ or higher
      E36-20 (LIN1) - Body ground* Always 10 kΩ or higher
      Standard Voltage
      Tester Connection Condition Specified Condition
      E36-21 (RLIN) - Body ground Always Below 1 V
      E36-20 (LIN1) - Body ground* Always Below 1 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. CHECK AIR CONDITIONING CONTROL PANEL (BATTERY VOLTAGE AND BODY GROUND)


    1. A0159WTE01

      Disconnect the E55 panel connector.

    2. Measure the resistance and voltage according to the value(s) in the tables below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      E55-1 (E) - Body ground Always Below 1 Ω
      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      E55-6 (IG) - Body ground Ignition switch ON 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. CHECK REAR AIR CONDITIONING CONTROL PANEL


    1. Temporarily replace the rear air conditioning control panel with a new or normally functioning one Click here.

    2. Check that the rear air conditioning function is normal.

      OK
      Rear air conditioning function is normal.
      Result
      Result Proceed to
      OK A
      NG (w/ Navigation System) B
      NG (w/o Navigation System) (for LHD) C
      NG (w/o Navigation System) (for RHD) D

    B

    CHECK FRONT AIR CONDITIONING CONTROL PANEL Click here

    C

    REPLACE AIR CONDITIONING AMPLIFIER Click here

    D

    REPLACE AIR CONDITIONING AMPLIFIER Click here

    A

    END (REAR AIR CONDITIONING CONTROL PANEL IS DEFECTIVE)

  5. CHECK FRONT AIR CONDITIONING CONTROL PANEL


    1. A0158T5E01

      Disconnect the F10 panel connector.

    2. Measure the resistance and voltage according to the value(s) in the tables below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      F10-1 (GND) - Body ground Always Below 1 Ω
      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      F10-7 (IG+) - Body ground Ignition switch ON 11 to 14 V

    NG

    REPLACE FRONT AIR CONDITIONING PANEL Click here

    OK

  6. CHECK FRONT AIR CONDITIONING CONTROL PANEL


    1. Temporarily replace the front air conditioning control panel with a new or normally functioning one Click here.

    2. Check the that front air conditioning function is normal.

      OK
      Front air conditioning function is normal.
      Result
      Result Proceed to
      OK A
      NG (for LHD) B
      NG (for RHD) C

    B

    REPLACE AIR CONDITIONING AMPLIFIER Click here

    C

    REPLACE FRONT AIR CONDITIONING CONTROL ASSEMBLY Click here

    A

    END (FRONT AIR CONDITIONING CONTROL PANEL IS DEFECTIVE)

  7. CHECK HARNESS AND CONNECTOR (A/C ECU - FRONT AIR CONDITIONING CONTROL PANEL)

    A015AKDE01

    1. Disconnect the E81 amplifier connector.

    2. Disconnect the F10 panel connector.

    3. Measure the resistance and voltage according to the value(s) in the tables below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      E81-37 (LIN1) - F10-5 (LIN1) Always Below 1 Ω
      E81-37 (LIN1) - Body ground Always 10 kΩ or higher
      Standard Voltage
      Tester Connection Condition Specified Condition
      E81-37 (LIN1) - Body ground Always Below 1 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  8. CHECK FRONT AIR CONDITIONING CONTROL ASSEMBLY (BATTERY VOLTAGE AND BODY GROUND)


    1. A0158T5E01

      Disconnect the F10 panel connector.

    2. Measure the resistance and voltage according to the value(s) in the tables below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      F10-1 (GND) - Body ground Always Below 1 Ω
      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      F10-7 (IG+) - Body ground Ignition switch ON 11 to 14 V

    NG

    REPLACE FRONT AIR CONDITIONING CONTROL ASSEMBLY Click here

    OK

  9. CHECK FRONT AIR CONDITIONING CONTROL ASSEMBLY


    1. Temporarily replace the front air conditioning control panel with a new or normally functioning one Click here.

      Check the that front air conditioning function is normal.

      OK
      Front air conditioning function is normal.
      Result
      Result Proceed to
      OK A
      NG (for LHD) B
      NG (for RHD) C

    B

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here

    C

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here

    A

    END (FRONT AIR CONDITIONING CONTROL PANEL IS DEFECTIVE)