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

DTC Code DTC Name
Headlight Signal Circuit

DESCRIPTION

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

WIRING DIAGRAM

E184865E01

CAUTION / NOTICE / HINT

Note:

Check that the headlight comes on when the light control switch is turned to the headlight position before proceeding to the inspection procedure.

PROCEDURE

  1. CHECK HARNESS AND CONNECTOR (HEADLIGHT SIGNAL)

    1. U123818E02

      Disconnect the H46 amplifier connector.

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

      Standard Voltage

      Tester Connection

      Switch Condition

      Specified Condition

      H46-27 (HLS) - Body ground

      Headlight dimmer switch off

      11 to 14 V

      H46-27 (HLS) - Body ground

      Headlight dimmer switch on

      Below 1 V
      Table 1. Text in Illustration

      *1

      Rear view of wire harness connector

      (to Air Conditioning Amplifier Assembly)

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

    (Click here)

    REPAIR OR REPLACE HARNESS OR CONNECTOR