LIGHTING SYSTEM Headlight (HI-BEAM) Circuit

DTC Code DTC Name
Headlight (HI-BEAM) Circuit

DESCRIPTION

When both of the following conditions are met, the high beam headlights come on.

  • The low beam headlights are turned on by automatic light control or manual light control.

  • The dimmer switch is in the high position.

When the dimmer switch is turned to the high flash position, the high beam headlights come on.

Tip:

  • If both the right and left high beam headlights do not illuminate when the low beam headlights are on and the dimmer switch is turned to the high position, perform the high beam headlight relay Active Test and read the dimmer switch high signal value in the Data List to determine if the malfunction exists on either the switch side or the relay side.

  • Before performing troubleshooting of the high beam headlight control, check that the low beam headlights operate normally.

WIRING DIAGRAM

E269499E02
E272571E01

CAUTION / NOTICE / HINT

Note:

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

PROCEDURE

  1. PERFORM ACTIVE TEST USING INTELLIGENT TESTER (HEADLIGHT)

    1. Using the intelligent tester, perform the Active Test (Click here).

      Table 1. Main Body

      Tester Display

      Test Part

      Control Range

      Diagnostic Note

      Head Light (HI)

      Headlight dimmer relay

      ON / OFF

      -

      OK

      Relay operates (high beam headlights illuminate).

    REPLACE MAIN BODY ECU (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY)

  2. INSPECT HEADLIGHT DIMMER RELAY (DIMMER)

    E270010E01
    Table 2. Text in Illustration

    *1

    for HID Headlight

    *2

    for Halogen Headlight

    1. Remove the headlight dimmer relay from the engine room No. 1 relay block, junction block.

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      3 - 5

      Battery voltage not applied between terminals 1 and 2

      10 kΩ or higher

      3 - 5

      Battery voltage applied between terminals 1 and 2

      Below 1 Ω

    REPLACE HEADLIGHT DIMMER RELAY

  3. CHECK HARNESS AND CONNECTOR (BATTERY - HEADLIGHT DIMMER RELAY [DIMMER])

    E345039E01

    1. Remove the headlight dimmer relay from the engine room No. 1 relay block, junction block.

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

      Standard Voltage

      Table 3. for HID Headlight:

      Tester Connection

      Condition

      Specified Condition

      Headlight dimmer relay terminal 1 - Body ground

      Always

      11 to 14 V

      Headlight dimmer relay terminal 3 - Body ground
      Table 4. for Halogen Headlight:

      Tester Connection

      Condition

      Specified Condition

      Headlight dimmer relay terminal 2 - Body ground

      Always

      11 to 14 V

      Headlight dimmer relay terminal 3 - Body ground
      Table 5. Text in Illustration

      *1

      Engine Room No. 1 Relay Block, Junction Block

      *2

      Headlight Dimmer Relay (DIMMER)

      *3

      for Halogen Headlight

      *4

      for HID Headlight

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  4. CHECK HARNESS AND CONNECTOR (HEADLIGHT DIMMER RELAY [DIMMER] - MAIN BODY ECU)

    U184813E02
    Table 6. Text in Illustration

    *1

    Front view of wire harness connector

    (to Main Body ECU)

    *2

    Engine Room No. 1 Relay Block, Junction Block

    *3

    Headlight Dimmer Relay (DIMMER)

    *4

    for Halogen Headlight

    *5

    for HID Headlight

    -

    -

    1. Remove the headlight dimmer relay from the engine room No. 1 relay block, junction block.

    2. Disconnect the H80 main body ECU connector.

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

      Standard Resistance

      Table 7. for HID Headlight:

      Tester Connection

      Condition

      Specified Condition

      Headlight dimmer relay terminal 2 - H80-12 (DIM)

      Always

      Below 1 Ω

      H80-12 (DIM) - Body ground

      Always

      10 kΩ or higher
      Table 8. for Halogen Headlight:

      Tester Connection

      Condition

      Specified Condition

      Headlight dimmer relay terminal 1 - H80-12 (DIM)

      Always

      Below 1 Ω

      H80-12 (DIM) - Body ground

      Always

      10 kΩ or higher

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

    (Click here)

    REPAIR OR REPLACE HARNESS OR CONNECTOR