LIGHTING SYSTEM Taillight Relay Circuit

DESCRIPTION

The main body ECU (network gateway ECU) receives headlight dimmer switch assembly information signals, and illuminates the clearance lights, taillights and license plate lights.

WIRING DIAGRAM

A004I4NE02

CAUTION / NOTICE / HINT

Tech Tips

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

PROCEDURE


  1. PERFORM ACTIVE TEST USING GTS (TAIL RELAY)


    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the GTS on.

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

    5. Check that the relay operates.

      Main Body
      Tester Display Test Part Control Range Diagnostic Note
      Taillight Relay Taillight relay ON/OFF -
      OK
      Taillight relay operates (taillights illuminate).
      Result
      Result Proceed to
      NG A
      OK B

    B

    REPLACE MAIN BODY ECU (NETWORK GATEWAY ECU) Click here

    A

  2. CHECK HARNESS AND CONNECTOR (BATTERY - INSTRUMENT PANEL JUNCTION BLOCK)


    1. Disconnect the 3E instrument panel junction block assembly connector.

    2. A004HSWE02
      Text in Illustration
      *a

      Component without harness connected

      (Instrument Panel Junction Block Assembly)

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      3E-1 - Body ground Always 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY


    1. Remove the instrument panel junction block assembly Click here.

    2. Remove the main body ECU (network gateway ECU) from the instrument panel junction block assembly.

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

      A004J25E03
      Text in Illustration
      *a

      Component without harness connected

      (Instrument Panel Junction Block Assembly)

      		 - -
      Standard Voltage
      Tester Connection Condition Specified Condition
      3C-12 - Battery negative (-) terminal

      Connect a positive (+) lead from the battery → 3E-1

      Connect a negative (-) lead from the battery → MB-7 (TRLY)

      		 11 to 14 V
      3C-13 - Battery negative (-) terminal

      Connect a positive (+) lead from the battery → 3E-1

      Connect a negative (-) lead from the battery → MB-7 (TRLY)

      		 11 to 14 V
      3D-24 - Battery negative (-) terminal

      Connect a positive (+) lead from the battery → 3E-1

      Connect a negative (-) lead from the battery → MB-7 (TRLY)

      		 11 to 14 V

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      3E-1 - 3C-12 Always 10 kΩ or higher
      3E-1 - 3C-13 Always 10 kΩ or higher
      3E-1 - 3D-24 Always 10 kΩ or higher

    OK

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

    NG

    REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY Click here