LANE-KEEPING ASSIST SYSTEM Main Switch Circuit

DESCRIPTION

The driving support ECU receives lane-keeping assist system on/off signals from the lane-keeping assist main switch.

WIRING DIAGRAM

A004TYAE47
*a Lane-keeping Assist Main Switch
*b Driving Support ECU

PROCEDURE


  1. READ VALUE USING INTELLIGENT TESTER (LANE-KEEPING ASSIST MAIN SWITCH)


    1. Use the Data List to check if the lane-keeping assist main switch is functioning properly.

      Lane Keep
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      LKA Main SW Lane-keeping assist main switch signal / ON or OFF

      ON: Lane-keeping assist main switch on

      OFF: Lane-keeping assist main switch off

      		 -
      OK
      On screen, item changes between ON and OFF according to above chart.

    OK

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

    NG

  2. INSPECT LANE-KEEPING ASSIST MAIN SWITCH

    A004U90

    1. for LHD:

      Remove the lane-keeping assist main switch Click here.

    2. for RHD:

      Remove the lane-keeping assist main switch Click here.

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      1 - 4 Lane-keeping assist main switch on Below 1 Ω
      Lane-keeping assist main switch off 10 kΩ or higher
      Result
      Result Proceed to
      OK A
      NG (for LHD) B
      NG (for RHD) C

    B

    REPLACE LANE-KEEPING ASSIST MAIN SWITCH Click here

    C

    REPLACE LANE-KEEPING ASSIST MAIN SWITCH Click here

    A

  3. CHECK HARNESS AND CONNECTOR (LANE-KEEPING ASSIST MAIN SWITCH - DRIVING SUPPORT ECU AND BODY GROUND)


    1. A004O2IE02
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Lane-keeping Assist Main Switch)
      *2

      Front view of wire harness connector

      (to Driving Support ECU)

      Disconnect the D36 switch connector.

    2. Disconnect the D14 ECU connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      D36-4 - D14-8 (LKSW) Always Below 1 Ω
      D36-1 - Body ground
      D36-4 - Body ground Always 10 kΩ or higher
      Result
      Result Proceed to
      OK (for LHD) A
      OK (for RHD) B
      NG C

    A

    REPLACE DRIVING SUPPORT ECU Click here

    B

    REPLACE DRIVING SUPPORT ECU Click here

    C

    REPAIR OR REPLACE HARNESS OR CONNECTOR