SOLAR VENTILATION SYSTEM Communication Circuit between Solar Ventilation ECU and A/C Amplifier

DESCRIPTION

The solar ventilation ECU communicates with the A/C amplifier using a direct line. The A/C amplifier checks the condition of the solar ventilation system based on signals sent via the direct line.

When this circuit malfunctions, Data List items for the solar ventilation system will not be displayed.

WIRING DIAGRAM

A01JD2QE01

INSPECTION PROCEDURE

PROCEDURE


  1. CHECK HARNESS AND CONNECTOR (SOLAR VENTILATION ECU - A/C AMPLIFIER)


    1. A01JC8UE18

      Disconnect the solar ventilation ECU connector.

    2. A01JAUIE75

      Disconnect the A/C amplifier connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      L22-17 (SIND) - L17-26 (SSLR) Always Below 1 Ω
      L22-17 (SIND) - Body ground Always 10 kΩ or higher
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Solar Ventilation ECU)
      *2

      Front view of wire harness connector

      (to A/C Amplifier)

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  2. REPLACE SOLAR VENTILATION ECU


    1. Replace the solar ventilation ECU with a known good one and check if the same problem occurs again Click here.

      OK
      Same problem does not occur.

    NG

    REPLACE A/C AMPLIFIER Click here

    OK

    END (SOLAR VENTILATION ECU WAS DEFECTIVE)