LIGHTING SYSTEM High Beam Headlight Circuit

DESCRIPTION

The main body ECU (multiplex network body ECU) controls the high beam headlights.

WIRING DIAGRAM

A0041E9E01

INSPECTION PROCEDURE

Note

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

PROCEDURE


  1. CHECK OPERATION (LOW BEAM HEADLIGHTS)


    1. Check the operation of the low beam headlights.

      OK
      Low beam headlights operate normally.

    NG

    GO TO PROBLEM SYMPTOMS TABLE Click here

    OK

  2. 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.

      Main Body
      Tester Display Test Part Control Range Diagnostic Note
      Head Light Hi High beam headlights ON/OFF -
      OK
      High beam headlights illuminate.

    NG

    INSPECT HEADLIGHT DIMMER RELAY (DIM) Click here

    OK

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

  3. INSPECT HEADLIGHT DIMMER RELAY (DIM)


    1. A0042YD

      Remove the DIM relay from the engine room relay block.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      3 - 5 Voltage is not applied between terminals 1 and 2 10 kΩ or higher
      3 - 5 Voltage is applied between terminals 1 and 2 Below 1 Ω

    NG

    REPLACE HEADLIGHT DIMMER RELAY

    OK

  4. CHECK HARNESS AND CONNECTOR (H-LP HI MAIN FUSE - HEADLIGHT DIMMER RELAY)


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

      Standard Voltage
      Tester Connection Condition Specified Condition
      Relay terminal 2 - Body ground Power switch off 11 to 14 V
      Relay terminal 3 - Body ground Power switch off 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  5. CHECK HARNESS AND CONNECTOR (HEADLIGHT DIMMER RELAY - INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY)


    1. Disconnect the 2C instrument panel junction block assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      Relay terminal 1 - 2C-22 Always Below 1 Ω
      2C-22 - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  6. CHECK HARNESS AND CONNECTOR (HEADLIGHT DIMMER RELAY - HEADLIGHT ASSEMBLY AND BODY GROUND)


    1. Disconnect the A8*1 or A11*2 headlight assembly LH connector.

    2. Disconnect the A38*1 or A41*2 headlight assembly RH connector.

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

      Standard Resistance
      LH Side
      Tester Connection Condition Specified Condition
      Relay terminal 5 - A8-2 (HI)*1 Always Below 1 Ω
      Relay terminal 5 - A11-2 (HI)*2 Always Below 1 Ω
      A8-2 (HI)*1 - Body ground Always 10 kΩ or higher
      A11-2 (HI)*2 - Body ground Always 10 kΩ or higher
      A8-1 (E)*1 - Body ground Always Below 1 Ω
      A11-1 (E)*2 - Body ground Always Below 1 Ω
      RH Side
      Tester Connection Condition Specified Condition
      Relay terminal 5 - A38-2 (HI)*1 Always Below 1 Ω
      Relay terminal 5 - A41-2 (HI)*2 Always Below 1 Ω
      A38-2 (HI)*1 - Body ground Always 10 kΩ or higher
      A41-2 (HI)*2 - Body ground Always 10 kΩ or higher
      A38-1 (E)*1 - Body ground Always Below 1 Ω
      A41-1 (E)*2 - Body ground Always Below 1 Ω

      • *1: for LED Headlight

      • *2: for Halogen Headlight


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  7. INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY


    1. A0043OAE26
      Text in Illustration
      *a

      Component without harness connected

      (Instrument Panel Junction Block Assembly)

      Remove the instrument panel junction block assembly Click here.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      2C-22 - MB-22 (DIM) Always Below 1 Ω
      2C-22 - Body ground Always 10 kΩ or higher

    NG

    REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY Click here

    OK

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