LIGHTING SYSTEM Headlight (HI-BEAM) Circuit

DESCRIPTION

The main body ECU receives a signal from the headlight dimmer switch assembly to control the HI-beam headlights.

WIRING DIAGRAM

A017E4EE02

INSPECTION PROCEDURE

PROCEDURE


  1. CHECK HEADLIGHT


    1. Check the operation of LO-beam headlights.

      OK
      LO-beam headlights operate normally.

    NG

    GO TO PROBLEM SYMPTOMS TABLE Click here

    OK

  2. PERFORM ACTIVE TEST USING INTELLIGENT TESTER


    1. Connect the intelligent tester to the DLC3.

    2. Turn the ignition switch on (IG).

    3. Turn the intelligent tester on.

    4. Select the following menu items: Body Electrical / Main Body / Active Test.

    5. Check that the relay operates.

      Main Body:
      Tester Display Test Part Control Range Diagnostic Note
      Head Light (HI) HI-beam headlight relay ON / OFF -
      OK
      Relay operates. (HI-beam headlights illuminate.)

    NG

    INSPECT ENGINE ROOM JUNCTION BLOCK ASSEMBLY Click here

    OK

    PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE Click here

  3. INSPECT ENGINE ROOM JUNCTION BLOCK ASSEMBLY


    1. A017BQKE04

      Remove the H-LP (RH) fuse and H-LP (LH) fuse from the engine room junction block assembly.

    2. Measure the voltage between the loading slot of each fuse and body ground.

      Standard voltage
      Tester Connection Condition Specified Condition
      H-LP (RH) terminal - Body ground Light control switch in HEAD and dimmer switch in HIGH 11 to 14 V
      H-LP (LH) terminal - Body ground Light control switch in HEAD and dimmer switch in HIGH 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (FUSE - BODY GROUND)

    OK

  4. INSPECT ENGINE ROOM JUNCTION BLOCK ASSEMBLY


    1. A017EOTE17

      Remove the engine room junction block assembly from the engine room relay block.

    2. Connect the positive (+) lead from the battery to terminal 2G-1.

    3. Connect the negative (-) lead from the battery to terminal 2D-8, 2D-9 and 2E-11.

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

      Standard voltage
      Tester Connection Condition Specified Condition
      2B-2 - Battery negative Always 11 to 14 V
      2B-3 - Battery negative Always 11 to 14 V

    NG

    REPLACE ENGINE ROOM JUNCTION BLOCK ASSEMBLY

    OK

  5. CHECK HARNESS AND CONNECTOR (ENGINE ROOM JUNCTION BLOCK ASSEMBLY - MAIN BODY ECU)


    1. A017B29E01

      Disconnect the 2D and 2E engine room junction block assembly connectors.

    2. Disconnect the 1D instrument panel junction block connector.

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

      Standard resistance
      Tester Connection Condition Specified Condition
      2E-11 - 1D-9 Always Below 1 Ω
      2D-9 - 1D-3 Always Below 1 Ω
      2E-11 - Body ground Always 10 kΩ or higher
      2D-9 - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE MAIN BODY ECU (INSTRUMENT PANEL JUNCTION BLOCK)