LIGHTING SYSTEM Headlight Solenoid Circuit

DESCRIPTION

When the main body ECU (multiplex network body ECU) receives a high beam turn on signal, the main body ECU (multiplex network body ECU) activates the bi-function by controlling the semiconductor pwr integration ECU. The bi-function increases the upper illumination area of the bulb (low beam) by moving a shade using a solenoid built into the headlight assembly.

WIRING DIAGRAM

A002194E03

CAUTION / NOTICE / HINT

Note


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

  • Check the operation of the low beam headlights. If the low beam headlights do not operate normally, refer to Problem Symptoms Table.

    Click here

  • Before replacing the main body ECU (multiplex network body ECU), refer to Service Bulletin.

PROCEDURE


  1. PERFORM ACTIVE TEST USING GTS


    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the GTS on.

    4. Enter the following menus: Body Electrical / Main Body / Active Test.

    5. Check that the high beam headlights illuminate.


      Body Electrical > Main Body > Active Test
      Tester Display Measurement Item Control Range Diagnostic Note
      Head Light Hi Dimmer relay (High beam headlights) ON/OFF -

      Body Electrical > Main Body > Active Test
      Tester Display
      Head Light Hi
      OK
      The high beam headlights illuminate.
      Result
      Proceed to
      OK
      NG

    OK

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

    NG

  2. CHECK SEMICONDUCTOR PWR INTEGRATION ECU


    1. Using a voltmeter, check the signal reading of the semiconductor pwr integration ECU.

      Click here

      OK
      Output signal reading is normal.
      Result
      Proceed to
      OK
      NG

    NG

    INSPECT SEMICONDUCTOR PWR INTEGRATION ECU (RESULTS OF SIGNAL READING CHECK) Click here

    OK

  3. CHECK HARNESS AND CONNECTOR (SEMICONDUCTOR PWR INTEGRATION ECU POWER SOURCE AND BODY GROUND)


    1. Remove the semiconductor pwr integration ECU from the No. 1 engine room relay block and No. 1 junction block assembly.

      Click here

      A0021IUC01
      *a

      Component without semiconductor pwr integration ECU connected

      (No. 1 Engine Room Relay Block and No. 1 Junction Block Assembly)

      		 - -

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      1B-1 (BATT) - Body ground Power switch off 11 to 14 V
      1A-1 (ALT) - Body ground Power switch off 11 to 14 V

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      1D-14 (GND1) - Body ground Always Below 1 Ω
      1G-5 (GND2) - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. CHECK HARNESS AND CONNECTOR (SEMICONDUCTOR PWR INTEGRATION ECU - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU))


    1. Disconnect the K2 main body ECU (multiplex network body ECU) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      1D-2 (-S) - K2-1 (DIM) Always Below 1 Ω
      K2-1 (DIM) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  5. CHECK SEMICONDUCTOR PWR INTEGRATION ECU


    1. Replace semiconductor pwr integration ECU with a new or known good one.

      Click here

    2. Check that the high beam headlights operate normally.

      OK
      The high beam headlights operate normally.
      Result
      Proceed to
      OK
      NG

    OK

    END (SEMICONDUCTOR PWR INTEGRATION ECU WAS DEFECTIVE)

    NG

    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) Click here