Click here

LIGHTING SYSTEM Headlight Signal Circuit

Click here
Click here Click here
DTC Code DTC Name
  Headlight Signal Circuit
Click here

DESCRIPTION

The main body ECU receives a headlight low switch information signal from the light control switch, and illuminates the headlight low beam.

A01564NE02
Click here

WIRING DIAGRAM

Click here

INSPECTION PROCEDURE

Note:

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

Click here

PROCEDURE


  1. Click here

    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
      Headlight Relay Headlight ON or OFF -
      OK
      Headlight low beam turns on/turns off.

  2. Click here

    INSPECT HEADLIGHT RELAY (HEAD LO)


    1. A015BM6E19

      Remove the headlight relay from the engine room 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 to terminals 1 and 2 10 kΩ or higher
      Battery voltage applied to terminals 1 and 2 Below 1 Ω

  3. Click here

    CHECK HARNESS AND CONNECTOR (BATTERY - HEADLIGHT RELAY [HEAD LO])


    1. A0157LFE02

      Remove the headlight relay from the engine room relay block, junction block.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      Headlight relay terminal 1 - Body ground Always 11 to 14 V
      Headlight relay terminal 5 - Body ground
      Table 2. Text in Illustration
      *a

      Front view of wire harness connector

      (to Headlight Relay [HEAD LO])

  4. Click here

    CHECK HARNESS AND CONNECTOR (HEADLIGHT RELAY [HEAD LO] - MAIN BODY ECU [COWL SIDE JUNCTION BLOCK LH])


    1. Remove the headlight relay from the engine room relay block, junction block.

    2. Disconnect the 2B main body ECU connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      Headlight relay terminal 2 - 2B-18 Always Below 1 Ω
      Headlight relay terminal 2 - Body ground Always 10 kΩ or higher

  5. Click here

    REPLACE MAIN BODY ECU (COWL SIDE JUNCTION BLOCK LH)

  6. Click here

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  7. Click here

    REPLACE HEADLIGHT RELAY (HEAD LO)

  8. Click here

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLEClick here