LIGHTING SYSTEM High Beam Headlight Circuit

DESCRIPTION

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

WIRING DIAGRAM

A003ZDIE02

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

    OK

  2. PERFORM ACTIVE TEST USING INTELLIGENT TESTER


    1. Connect the intelligent tester to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the intelligent tester on.

    4. Enter the following menus: Body / 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. A003XO1E01
      Text in Illustration
      *a

      Component without harness connected

      (Headlight Dimmer Relay)

      Remove the headlight dimmer 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
      Headlight dimmer relay terminal 2 - Body ground Power switch off 11 to 14 V
      Headlight dimmer 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 - HEADLIGHT ASSEMBLY)


    1. Disconnect the A8 or A39 headlight assembly connector (for LED headlight).

    2. Disconnect the A10 or A41 headlight assembly connector (except LED headlight).

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

      Standard Resistance
      for LH side, LED Headlight
      Tester Connection Condition Specified Condition
      5 - A8-6 (HI) Always Below 1 Ω
      5 - Body ground Always 10 kΩ or higher
      A8-5 (E) - Body ground Always Below 1 Ω
      for RH side, LED Headlight
      Tester Connection Condition Specified Condition
      5 - A39-6 (HI) Always Below 1 Ω
      5 - Body ground Always 10 kΩ or higher
      A39-5 (E) - Body ground Always Below 1 Ω
      for LH side, except LED Headlight
      Tester Connection Condition Specified Condition
      5 - A10-3 (HI) Always Below 1 Ω
      5 - Body ground Always 10 kΩ or higher
      A10-5 (E) - Body ground Always Below 1 Ω
      for RH side, except LED Headlight
      Tester Connection Condition Specified Condition
      5 - A41-3 (HI) Always Below 1 Ω
      5 - Body ground Always 10 kΩ or higher
      A41-5 (E) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  6. CHECK HARNESS AND CONNECTOR (HEADLIGHT DIMMER RELAY - MAIN BODY ECU)


    1. Disconnect the 2C 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
      Headlight dimmer 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

  7. CHECK INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY


    1. Remove the instrument panel junction block assembly.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      2C-22 - A-22 (DIM) Always Below 1 Ω

    NG

    REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

    OK

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