WIPER AND WASHER SYSTEM Headlight Signal Circuit

DTC Code DTC Name
Headlight Signal Circuit

DESCRIPTION

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

WIRING DIAGRAM

E257549E02

CAUTION / NOTICE / HINT

Note:

First check that the low beam headlights operate normally.

PROCEDURE

  1. CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY - HEADLIGHT CLEANER CONTROL RELAY)

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

      Standard Voltage

      Tester Connection

      Condition

      Specified Condition

      3A-35 - Body ground

      Light control switch in head position

      Below 1 V

      Light control switch off

      4.2 V or higher

    Result

    Proceed to

    OK

    NG
    OK

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

    Click hereClick here

    NG

  2. CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY - HEADLIGHT CLEANER CONTROL RELAY)

    1. Disconnect the 3A instrument panel junction block assembly connector.

    2. Disconnect the A94 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

      3A-35 - A94-1 (HDLO)

      Always

      Below 1 Ω

      3A-35 - Body ground

      Always

      10 kΩ or higher

    Result

    Proceed to

    OK

    NG
    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

    1. E257559C01

      *a

      Component without harness connected

      (Instrument Panel Junction Block Assembly)

      Remove the instrument panel junction block assembly.

      for LHD:Click hereClick here

      for RHD:Click hereClick here

    2. Remove the main body ECU (multiplex network body ECU).

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      3A-35 - MB-15 (HRLY)

      Always

      Below 1 Ω

      3A-35 - Body ground

      Always

      10 kΩ or higher

    Result

    Proceed to

    OK

    NG
    NG

    REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

    for LHD:Click hereClick here

    for RHD:Click hereClick here

    OK

  4. REPLACE HEADLIGHT CLEANER CONTROL RELAY

    1. Replace the headlight cleaner control relay assembly with a new or a known good one.

      Click hereClick here

    Result

    Result

    Proceed to

    The operation of the headlight cleaner returns to normal.

    OK

    The operation of the headlight cleaner does not return to normal.

    NG
    OK

    END (HEADLIGHT CLEANER CONTROL RELAY WAS DEFECTIVE)

    NG

    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

    for LHD:Click hereClick here

    for RHD:Click hereClick here