WIPER AND WASHER SYSTEM(w/ Rain Sensor) Headlight Signal Circuit

DESCRIPTION

The headlight cleaner control relay detects the low beam headlights status.

WIRING DIAGRAM

A01WZXPE01
*a Main Body ECU (Cowl Side Junction Block LH)
*b Headlight Cleaner Control Relay

PROCEDURE


  1. CHECK LOW BEAM HEADLIGHTS OPERATION


    1. Check that the low beam headlights operate normally Click here.

      OK
      Low beam headlights operate normally.

    NG

    GO TO LIGHTING SYSTEM Click here

    OK

  2. CHECK HARNESS AND CONNECTOR (HEADLIGHT CLEANER CONTROL RELAY - MAIN BODY ECU)


    1. A01X0RSE01
      *1 Front view of wire harness connector: (to Main Body ECU [Cowl Side Junction Block LH])
      *2 Front view of wire harness connector: (to Headlight Cleaner Control Relay)

      Disconnect the E2 main body ECU (cowl side junction block LH) connector.

    2. Disconnect the headlight cleaner control relay connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      1 (HDLO) - E2-13 (HDLO) Always Below 1 Ω
      1 (HDLO) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. CHECK MAIN BODY ECU (COWL SIDE JUNCTION BLOCK LH)


    1. A01XA5TE26
      *1 Front view of wire harness connector: (to Headlight Cleaner Control Relay)

      Disconnect the headlight cleaner control relay connector.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      1 (HDLO) - Body ground

      Engine switch on (IG)

      Headlight dimmer switch in HEAD

      		 11 to 14 V
      1 (HDLO) - Body ground

      Engine switch on (IG)

      Headlight dimmer switch not in HEAD

      		 Below 1 V

    OK

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

    NG

    REPLACE MAIN BODY ECU (COWL SIDE JUNCTION BLOCK LH)