AIR CONDITIONING SYSTEM (for Automatic Air Conditioning System) Air Conditioning Control Panel does not Operate

DESCRIPTION

This circuit* consists of the air conditioning control assembly and the air conditioning amplifier assembly. When the air conditioning control assembly is operated, signals are transmitted to the air conditioning amplifier assembly through the LIN communication system.

If the LIN communication system malfunctions, the air conditioning amplifier assembly does not operate even if the air conditioning control assembly is operated.

Tech Tips

*: w/o Multi-display

WIRING DIAGRAM

A0158PME08
A0158PME09

INSPECTION PROCEDURE

PROCEDURE


  1. INSPECT FUSE (ECU-IG NO. 2)


    1. Remove the ECU-IG NO. 2 fuse from the engine room relay block.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      ECU-IG NO. 2 fuse Always Below 1 Ω

    NG

    REPLACE FUSE

    OK

  2. CHECK HARNESS AND CONNECTOR (AIR CONDITIONING CONTROL - BODY GROUND AND BATTERY)

    A0157FJE01

    1. Disconnect the F10 air conditioning control assembly connector.

    2. Measure the resistance and voltage according to the value(s) in the table 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
      F10-1 (GND) - F10-7 (IG+) Engine switch on (IG) 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER - AIR CONDITIONING CONTROL)


    1. A015CNKE03

      w/ Rear Heater


      1. Disconnect the F10 air conditioning control assembly connector.

      2. Disconnect the E36 amplifier connector.

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

        Standard Resistance
        Tester Connection Condition Specified Condition
        E36-20 (LIN1) - F10-5 (LIN1) Always Below 1 Ω
        E36-20 (LIN1) - Body ground Always 10 kΩ or higher
    2. A015E8DE02

      w/o Rear Heater


      1. Disconnect the F10 air conditioning control assembly connector.

      2. Disconnect the E81 amplifier connector.

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

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. CHECK AIR CONDITIONING CONTROL ASSEMBLY (OPERATION)


    1. Replace the air conditioning control assembly with a new or properly functioning one.

    2. Operate the front air conditioning control to check that it functions properly.

      OK
      Air conditioning control assembly function operates normally.

    NG

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here

    OK

    REPLACE AIR CONDITIONING CONTROL ASSEMBLY Click here