AIR CONDITIONING SYSTEM Air Conditioning Control Panel Circuit

DESCRIPTION

This circuit consists of the A/C control assembly and A/C amplifier. When the A/C control assembly is operated, signals are transmitted to the A/C amplifier through the LIN communication system.

If the LIN communication system malfunctions, the A/C amplifier does not operate even if the A/C control assembly is operated.

WIRING DIAGRAM

A003TQJE12

INSPECTION PROCEDURE

Note

Inspect the fuses for circuits related to this system before performing the following inspection procedure.

PROCEDURE


  1. CHECK HARNESS AND CONNECTOR (A/C CONTROL ASSEMBLY - BODY GROUND)


    1. A003SYXE01
      Text in Illustration
      *1

      Front view of wire harness connector

      (to A/C Control Assembly)

      Disconnect the E76 A/C control assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      E76-5 (GND) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  2. CHECK HARNESS AND CONNECTOR (A/C CONTROL ASSEMBLY - BATTERY)


    1. A003SYXE02
      Text in Illustration
      *1

      Front view of wire harness connector

      (to A/C Control Assembly)

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      E76-2 (IG+) - E76-5 (GND) Power switch on (IG) 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. CHECK HARNESS AND CONNECTOR (A/C AMPLIFIER - A/C CONTROL ASSEMBLY)


    1. Disconnect the E30 A/C amplifier connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      E30-37 (LIN1) - E76-10 (LIN1) Always Below 1 Ω
      E30-37 (LIN1) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. REPLACE A/C CONTROL ASSEMBLY


    1. Replace the A/C control assembly with a known good one and check if the same problem occurs again Click here.

      OK
      Same problem does not occur.

    NG

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

    OK

    END (A/C CONTROL ASSEMBLY WAS DEFECTIVE)