LIGHTING SYSTEM Headlight Relay Circuit

DESCRIPTION

The HEAD LP relay is turned on by operating the headlight switch.

WIRING DIAGRAM

A0163C2E02

INSPECTION PROCEDURE

PROCEDURE


  1. PERFORM ACTIVE TEST USING INTELLIGENT TESTER


    1. Connect the intelligent tester to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the intelligent tester on.

    4. Enter the following menus: Body / Body / Active Test.

    5. Check the operation.

      Body (Main Body ECU RH)
      Tester Display Test Part Control Range Diagnostic Note
      Headlight Relay Headlight relay ON/OFF -
      OK
      Headlight assembly (low) illuminates.

    NG

    INSPECT FUSE (H-LP L LWR, H-LP R LWR) Click here

    OK

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

  2. INSPECT FUSE (H-LP L LWR, H-LP R LWR)


    1. Remove the H-LP L LWR fuse from the No. 2 engine room relay block .

    2. Remove the H-LP R LWR fuse from the No. 2 engine room relay block .

    3. Measure the resistance of the fuses.

      Standard Resistance
      Below 1 Ω

    NG

    REPLACE FUSE

    OK

  3. INSPECT HEAD LP RELAY


    1. A0161ULE01

      Remove the HEAD LP relay from the engine room No. 1 relay block.

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

      Standard Resistance
      Tester Connection Specified Condition
      3 - 5 10 kΩ or higher
      3 - 5

      Below 1 Ω

      (When battery voltage is applied to terminals 1 and 2)

    NG

    REPLACE HEAD LP RELAY

    OK

  4. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU RH - BATTERY)


    1. Disconnect the RL main body ECU RH connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      RL-7 (HRLY) - Body ground Always 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  5. CHECK HARNESS AND CONNECTOR (HEADLIGHT (LOW LH OR LOW RH) - BATTERY)


    1. Check the wire harness between the headlight (Low LH) and battery.


      1. Disconnect the B12 headlight connector.

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

        Standard Voltage
        Tester Connection Condition Specified Condition
        B12-17 (LO) - Body ground Turn the light control switch to the ON (HEAD) position. 11 to 14 V

    2. Check the wire harness between the headlight (Low RH) and battery.


      1. Disconnect the B2 headlight connector.

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

        Standard Voltage
        Tester Connection Condition Specified Condition
        B2-17 (LO) - Body ground Turn the light control switch to the ON (HEAD) position. 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE MAIN BODY ECU RH (COWL SIDE JUNCTION BLOCK RH)