LANE-KEEPING ASSIST SYSTEM Headlight Dimmer Switch Circuit

DESCRIPTION

The driving support ECU receives turn signal switch signals from the headlight dimmer switch assembly via the windshield wiper switch and controls the lane keeping assist system.

WIRING DIAGRAM

A01FDZ5E02
A01FDZ5E03

INSPECTION PROCEDURE

PROCEDURE


  1. INSPECT HEADLIGHT DIMMER SWITCH ASSEMBLY


    1. Remove the headlight dimmer switch assembly Click here.

    2. Inspect the headlight dimmer switch assembly Click here.


    NG

    REPLACE HEADLIGHT DIMMER SWITCH ASSEMBLY Click here

    OK

  2. CHECK HARNESS AND CONNECTOR (HEADLIGHT DIMMER SWITCH ASSEMBLY - WINDSHIELD WIPER SWITCH ASSEMBLY)


    1. Disconnect the N28 headlight dimmer switch assembly connector.

    2. Disconnect the N35 windshield wiper switch assembly connector.

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

      Standard Resistance
      for LHD, RHD Headlight Dimmer Switch LH Side Type
      Tester Connection Condition Specified Condition
      N28-14 (TL) - N35-13 (TL1) Always Below 1 Ω
      N28-15 (TR) - N35-14 (TR1) Always Below 1 Ω
      N28-16 (E) - N35-6 (GND1) Always Below 1 Ω
      N28-17 (CR) - N35-12 (CR1) Always Below 1 Ω
      N28-14 (TL) - Body ground Always 10 kΩ or higher
      N28-15 (TR) - Body ground Always 10 kΩ or higher
      N28-16 (E) - Body ground Always 10 kΩ or higher
      N28-17 (CR) - Body ground Always 10 kΩ or higher
      for RHD Headlight Dimmer Switch RH Side Type
      Tester Connection Condition Specified Condition
      N28-22 (TL) - N35-13 (TL1) Always Below 1 Ω
      N28-23 (TR) - N35-14 (TR1) Always Below 1 Ω
      N28-21 (E) - N35-6 (GND1) Always Below 1 Ω
      N28-20 (CR) - N35-12 (CR1) Always Below 1 Ω
      N28-22 (TL) - Body ground Always 10 kΩ or higher
      N28-23 (TR) - Body ground Always 10 kΩ or higher
      N28-21 (E) - Body ground Always 10 kΩ or higher
      N28-20 (CR) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. CHECK HARNESS AND CONNECTOR (WINDSHIELD WIPER SWITCH ASSEMBLY - DRIVING SUPPORT ECU)


    1. Disconnect the N35 windshield wiper switch assembly connector.

    2. Disconnect the N5 driving support ECU connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      N35-16 (TR2) - N5-34 (WNKR) Always Below 1 Ω
      N35-17 (TL2) - N5-35 (WNKL) Always Below 1 Ω
      N35-16 (TR2) - Body ground Always 10 kΩ or higher
      N35-17 (TL2) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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