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

A01J9JKE04

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. A01JCTNE26
      Text in Illustration
      *1

      Front view of wire harness connector

      (to A/C Control Assembly)

      Disconnect the 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
      L20-8 (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. A01JCTNE27
      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
      L20-5 (IG+) - L20-8 (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. A01JAUIE65

      Disconnect the A/C amplifier connector.

    2. A01JCTNE28
      Text in Illustration
      *1

      Front view of wire harness connector

      (to A/C Amplifier)
      *2

      Front view of wire harness connector

      (to A/C Control Assembly)

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      L17-37 (LIN1) - L20-2 (TX+) Always Below 1 Ω
      L17-37 (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)