LANE-KEEPING ASSIST SYSTEM Wiper and Washer Switch Circuit

DESCRIPTION

When the driving support ECU receives a windshield wiper switch signal, the driving support ECU cancels the lane-keeping assist system.

WIRING DIAGRAM

A006W3JE01

INSPECTION PROCEDURE

Note

Inspect the fuses for circuits related to this system before performing the following inspection procedure.

PROCEDURE


  1. INSPECT WINDSHIELD WIPER SWITCH ASSEMBLY


    1. A006UQPE01

      Remove the windshield wiper switch Click here.

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

      Standard Resistance
      Front Wiper Switch
      Tester Connection Switch Condition Specified Condition
      2 (+B) - 4 (+2) Hi Below 1 Ω
      Except Hi 10 kΩ or higher
      Washer Switch
      Tester Connection Switch Condition Specified Condition
      3 (WF) - 2 (EW) On Below 1 Ω
      Off 10 kΩ or higher

    NG

    REPLACE WINDSHIELD WIPER SWITCH ASSEMBLY Click here

    OK

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


    1. A006WCIE01
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Windshield Wiper Switch Assembly)

      Disconnect the D33 and D34 switch connectors.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      D33-2 (+B) - Body ground Ignition switch ON 11 to 14 V
      Ignition switch off Below 1 V

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      D34-2 (EW) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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

    A006WQ2E01

    1. Disconnect the D14 ECU connector.

    2. Disconnect the D33 and D34 switch connectors.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      D14-32 (WIP2) - D33-4 (+2) Always Below 1 Ω
      D14-9 (WASH) - D34-3 (WF)
      D14-32 (WIP2) - Body ground Always 10 kΩ or higher
      D14-9 (WASH) - Body ground
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Driving Support ECU)

      		 *2

      Front view of wire harness connector

      (to Windshield Wiper Switch Assembly)

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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