LIGHTING SYSTEM Headlight (HI-BEAM) Circuit

DESCRIPTION

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


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

Tech Tips


  • 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

A01ITO6E01
A01IOWNE01

INSPECTION PROCEDURE

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.

      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).

    NG

    INSPECT HEADLIGHT DIMMER RELAY (DIMMER) Click here

    OK

    REPLACE MAIN BODY ECU (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY)

  2. INSPECT HEADLIGHT DIMMER RELAY (DIMMER)

    A01INDHE01
    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

    NG

    REPLACE HEADLIGHT DIMMER RELAY

    OK

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

    A01IQ44E01
    Text in Illustration
    *1 Engine Room No. 1 Relay Block, Junction Block
    *2 Headlight Dimmer Relay (DIMMER)
    *3 for HID Headlight
    *4 for Halogen Headlight

    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
      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
      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

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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

    A01IQYRE01
    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 HID Headlight
    *5 for Halogen 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
      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
      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

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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