AIR CONDITIONING SYSTEM(for Automatic Air Conditioning System) Headlight Signal Circuit

DESCRIPTION

The air conditioning amplifier assembly receives the headlight illumination signal and uses the signal to judge electric load conditions. The electric load signal is one element of PTC heater control.

WIRING DIAGRAM

A004TD1E01

PROCEDURE


  1. CHECK HEADLIGHT (OPERATION)


    1. Check if the headlight comes on when the light control switch is turned to the headlight position.

      OK
      Headlight comes on.

    NG

    GO TO LIGHTING SYSTEM Click here

    OK

  2. CHECK HARNESS AND CONNECTOR (HEADLIGHT SIGNAL)


    1. A004U39E01
      Text in Illustration
      *1

      Rear view of wire harness connector

      (to Air Conditioning Amplifier Assembly)

      Disconnect the D47 amplifier connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      D47-27 (HLS) - Body ground

      • Engine started

      • Headlight dimmer switch: off

      		 11 to 14 V
      D47-27 (HLS) - Body ground

      • Engine started

      • Headlight dimmer switch: on

      		 Below 1 V

    OK

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

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR