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.

WIRING DIAGRAM

A004S10E01
*a from Engine Stop and Start ECU
*b Air Conditioning Control Assembly
*c Air Conditioning Amplifier Assembly
*d LIN Communication Line

PROCEDURE


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

    A004RWLE01
    Text in Illustration
    *1

    Front view of wire harness connector

    (to Air Conditioning Control Assembly)

    1. Disconnect the D12 air conditioning control assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      D12-11 (GND) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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

    A004NUCE01
    Text in Illustration
    *1

    Front view of wire harness connector

    (to Air Conditioning Control Assembly)

    1. Disconnect the D12 air conditioning control assembly connector.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      D12-11 (GND) - D12-5 (IG+) Ignition switch off Below 1 V
      D12-11 (GND) - D12-5 (IG+) Ignition switch ON 10.5 to 16 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. CHECK AIR CONDITIONING CONTROL ASSEMBLY (OPERATION)


    1. Replace the air conditioning control assembly with a new or normally functioning one Click here.

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

      OK
      Air conditioning control assembly operates normally.

    OK

    END (AIR CONDITIONING CONTROL ASSEMBLY IS DEFECTIVE)

    NG

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE Click here