LIN COMMUNICATION SYSTEM Rear Heater Control Panel LIN Communication Malfunction

DESCRIPTION

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

Tech Tips

"Rear heater control panel" refers to the rear air conditioning control panel.

WIRING DIAGRAM

A01ER96E01

INSPECTION PROCEDURE

Note

When using the intelligent tester with the engine 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 HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER - REAR AIR CONDITIONING CONTROL PANEL)

    A01ESL2E01

    1. Disconnect the E36 amplifier connector.

    2. Disconnect the 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
      E36-21 (RLIN) - Body ground Always 10 kΩ or higher
      Standard Voltage
      Tester Connection Condition Specified Condition
      E36-21 (RLIN) - Body ground Always Below 1 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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


    1. A01EQ7XE01

      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 Condition Specified Condition
      E55-6 (IG) - Body ground Engine switch on (IG) 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. 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.

    NG

    REPLACE AIR CONDITIONING AMPLIFIER Click here

    OK

    END (REAR AIR CONDITIONING CONTROL PANEL IS DEFECTIVE)