LIGHTING SYSTEM(for Halogen Headlight) Headlight Relay Circuit

DESCRIPTION

The main body ECU (multiplex network body ECU) receives light control switch information signals and illuminates the low beam headlights.

WIRING DIAGRAM

B001F8WE01

CAUTION / NOTICE / HINT

Note


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

  • w/ Entry and Start System:

    Before replacing the main body ECU (multiplex network body ECU), refer to Registration.

PROCEDURE


  1. PERFORM ACTIVE TEST USING GTS


    1. Using the GTS, perform the Active Test.

      Click here

      Main Body
      Tester Display Test Part Control Range Diagnostic Note
      Headlight Low beam headlights OFF or ON -
      OK
      Low beam headlights turn on.
      Result
      Proceed to
      OK
      NG

    OK

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

    NG

  2. INSPECT HEADLIGHT RELAY (H-LP LO)


    1. Remove the headlight relay (H-LP LO) from the engine room relay block and junction block.

    2. Inspect the headlight relay (H-LP LO).

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE HEADLIGHT RELAY (H-LP LO)

    OK

  3. CHECK HARNESS AND CONNECTOR (HEADLIGHT RELAY [H-LP LO] - BATTERY)


    1. B001HRSC04
      *a

      Front view of wire harness connector

      (to Headlight Relay [H-LP LO])

      Remove the headlight relay (H-LP LO) from the engine room relay block and junction block.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      Headlight relay (H-LP LO) terminal 1 - Body ground Always 11 to 14 V
      Headlight relay (H-LP LO) terminal 5 - Body ground Always 11 to 14 V
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. CHECK HARNESS AND CONNECTOR (HEADLIGHT RELAY [H-LP LO] - DRIVER SIDE JUNCTION BLOCK ASSEMBLY AND HEADLIGHT ASSEMBLY)


    1. Remove the headlight relay (H-LP LO) from the engine room relay block and junction block.

    2. Disconnect the 2M*1 or 2F*2 driver side junction block assembly connector.


      • *1: except 5L-E

      • *2: for 5L-E

    3. Disconnect the A111 headlight assembly LH connector.

    4. Disconnect the A113 headlight assembly RH connector.

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

      Standard Resistance
      except 5L-E
      Tester Connection Condition Specified Condition
      Headlight relay (H-LP LO) terminal 2 - 2M-17 Always Below 1 Ω
      Headlight relay (H-LP LO) terminal 3 - A111-2 (B) Always Below 1 Ω
      Headlight relay (H-LP LO) terminal 2 or 2M-17 - Body ground Always 10 kΩ or higher
      Headlight relay (H-LP LO) terminal 3 or A111-2 (B) - Body ground Always 10 kΩ or higher
      for 5L-E
      Tester Connection Condition Specified Condition
      Headlight relay (H-LP LO) terminal 2 - 2F-40 Always Below 1 Ω
      Headlight relay (H-LP LO) terminal 3 - A111-2 (B) Always Below 1 Ω
      Headlight relay (H-LP LO) terminal 2 or 2F-40 - Body ground Always 10 kΩ or higher
      Headlight relay (H-LP LO) terminal 3 or A111-2 (B) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  5. CHECK DRIVER SIDE JUNCTION BLOCK ASSEMBLY


    1. Remove the driver side junction block assembly.

      Click here

      B001GA7C01
      *A except 5L-E *B for 5L-E
      *a

      Component without harness connected

      (Driver Side Junction Block Assembly)

      		 - -

    2. Remove the main body ECU (multiplex network body ECU) from the driver side junction block assembly.

      Click here

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

      Standard Resistance
      except 5L-E
      Tester Connection Condition Specified Condition
      2M-17 - A-15 (HRLY) Always Below 1 Ω
      for 5L-E
      Tester Connection Condition Specified Condition
      2F-40 - A-15 (HRLY) Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) Click here

    NG

    REPLACE DRIVER SIDE JUNCTION BLOCK ASSEMBLY Click here