LIGHTING SYSTEM Headlight Signal Circuit

DESCRIPTION

The main body ECU RH receives a HEAD position signal from the combination switch as a backup link. It also receives a signal from the combination switch via the multiplex communication system.

If this link is grounded, the headlights illuminate.

WIRING DIAGRAM

A01623DE02

INSPECTION PROCEDURE

PROCEDURE


  1. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU RH - WINDSHIELD WIPER SWITCH ASSEMBLY)


    1. A01630ZE09

      Disconnect the J74 ECU connector.

    2. Disconnect the J26 windshield wiper switch assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      J74-23 (HEAD) - J26-4 (HEAD) Always Below 1 Ω
      J74-23 (HEAD) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  2. CHECK HARNESS AND CONNECTOR (WINDSHIELD WIPER SWITCH ASSEMBLY - BODY GROUND)


    1. A0161MZE17

      Disconnect the J26 windshield wiper switch assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      J26-5 (E) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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