WIPER AND WASHER SYSTEM Headlight Cleaner Switch Circuit

DESCRIPTION

This circuit detects the conditions of the headlight control rheostat.

The headlight cleaner control relay receives the following signals through the CAN line:


WIRING DIAGRAM

A001AW1E01

PROCEDURE


  1. CHECK FRONT LIGHT ECU (HDLO SIGNAL)


    1. A001DVEE02
      *1 Rear view of wire harness connector: (to Front Light ECU)

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

      Standard voltage
      Tester Connection Switch Condition Specified Condition
      A51-5 (HDLO) - Body ground Engine switch on (IG), light control rheostat OFF 11 to 14 V
      A51-5 (HDLO) - Body ground Engine switch on (IG), light control rheostat in HEAD or TAIL Below 1 V

    NG

    CHECK HARNESS AND CONNECTOR (CONTROL RELAY - FRONT LIGHT ECU) Click here

    OK

  2. CHECK FRONT LIGHT ECU (FRWA SIGNAL)


    1. A001F3JE02
      *1 Rear view of wire harness connector: (to Front Light ECU)

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

      Standard voltage
      Tester Connection Switch Condition Specified Condition
      A51-7 (FRWA) - Body ground Engine switch on (IG), front washer is stopped 10 to 14 V
      A51-7 (FRWA) - Body ground Engine switch on (IG), front washer is operated Below 1 V

    NG

    CHECK HARNESS AND CONNECTOR (CONTROL RELAY - FRONT LIGHT ECU) Click here

    OK

  3. CHECK HARNESS AND CONNECTOR (RHEOSTAT - BODY GROUND)


    1. A001FEWE02
      *1 Front view of wire harness connector: (to Rheostat)

      Disconnect the L8 rheostat connector.

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

      Standard voltage
      Tester Connection Condition Specified Condition
      L8-2 (B) - Body ground Always 11 to 14 V

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

      Standard resistance
      Tester Connection Condition Specified Condition
      L8-5 (E) - Body ground Below Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. CHECK HEADLIGHT CLEANER CONTROL RELAY


    1. A001DI3E02
      *1 Front view of wire harness connector: (to Control Relay)

      Disconnect the A6 control relay connector.

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

      Standard voltage
      Tester Connection Condition Specified Condition
      A6-2 (H) - Body ground Always 11 to 14 V

    OK

    PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE Click here

    NG

    CHECK HARNESS AND CONNECTOR (CONTROL RELAY - FRONT LIGHT ECU) Click here

  5. CHECK HARNESS AND CONNECTOR (CONTROL RELAY - FRONT LIGHT ECU)


    1. Disconnect the A6 control relay connector.

      A001B4DE01
      *1 Front view of wire harness connector: (to Control Relay)
      *2 Front view of wire harness connector: (to Front Light ECU)

    2. Disconnect the A51 ECU connector.

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

      Standard resistance
      Tester Connection Condition Specified Condition
      A6-1 (HDLO) - A51-5 (HDLO) Always Below 1 Ω
      A6-1 (HDLO) - Body ground Always 10 kΩ or higher

    OK

    PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  6. CHECK HARNESS AND CONNECTOR (CONTROL RELAY - FRONT LIGHT ECU)


    1. Disconnect the A6 control relay connector.

      A001D0BE01
      *1 Front view of wire harness connector: (to Control Relay)
      *2 Front view of wire harness connector: (to Front Light ECU)

    2. Disconnect the A51 ECU connector.

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

      Standard resistance
      Tester Connection Condition Specified Condition
      A6-5 (FRWA) - A51-7 (FRWA) Always Below 1 Ω
      A6-5 (FRWA) - Body ground Always 10 kΩ or higher

    OK

    PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  7. CHECK HARNESS AND CONNECTOR (CONTROL RELAY - FRONT LIGHT ECU)


    1. Disconnect the A6 control relay connector.

      A001994E01
      *1 Front view of wire harness connector: (to Headlight Cleaner Control Relay)
      *2 Front view of wire harness connector: (to Front Controller)

    2. Disconnect the A51 ECU connector.

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

      Standard resistance
      Tester Connection Condition Specified Condition
      A6-2 (H) - A51-6 (H) Always Below 1 Ω
      A6-2 (H) - Body ground Always 10 kΩ or higher

    OK

    PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR