LANE-KEEPING ASSIST SYSTEM Main Switch Circuit

DESCRIPTION

The driving support ECU receives lane-keeping assist main switch ON/OFF signal from the steering pad switch assembly.

WIRING DIAGRAM

A01FEM3E01

INSPECTION PROCEDURE

Note

When replacing the driving support ECU, always replace it with a new one and be sure to perform initialization Click here. If an ECU which was installed to another vehicle is used, the information stored in the ECU will not match the information from the vehicle, and as a result, a DTC may be stored.

PROCEDURE


  1. READ VALUE USING GTS (LKA MAIN SW)


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

      Lane Keep Assist
      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 is on

      OFF: Lane-keeping assist main switch is off

      		 -
      OK
      Display changes according to lane-keeping assist main switch described in above table.

    NG

    INSPECT STEERING PAD SWITCH ASSEMBLY Click here

    OK

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

  2. INSPECT STEERING PAD SWITCH ASSEMBLY


    1. Remove the steering pad switch assembly Click here.

    2. Inspect the steering pad switch assembly Click here.


    NG

    REPLACE STEERING PAD SWITCH ASSEMBLY Click here

    OK

  3. INSPECT SPIRAL WITH SENSOR CABLE SUB-ASSEMBLY


    1. Remove the spiral with sensor cable sub-assembly Click here.

    2. Inspect the spiral with sensor cable sub-assembly Click here.


    NG

    REPLACE SPIRAL WITH SENSOR CABLE SUB-ASSEMBLY Click here

    OK

  4. CHECK HARNESS AND CONNECTOR (SPIRAL WITH SENSOR CABLE SUB-ASSEMBLY - DRIVING SUPPORT ECU AND BODY GROUND)


    1. Disconnect the N31 spiral with sensor cable sub-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
      N31-12 (DIST) - N5-6 (SPSW) Always Below 1 Ω
      N31-2 (ECC) - Body ground Always Below 1 Ω
      N31-12 (DIST) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE DRIVING SUPPORT ECU Click here