LIGHTING SYSTEM(for LED Headlight) Taillight Relay Circuit

DESCRIPTION

The main body ECU (multiplex network body ECU) controls the taillight and license plate light.

WIRING DIAGRAM

B001DAAE01

CAUTION / NOTICE / HINT

Note


  • Inspect the fuse for circuits related to this system before performing the follow procedure.

  • Before replacing the main body ECU (multiplex network body ECU), refer to Service Bulletin.

PROCEDURE


  1. PERFORM ACTIVE TEST USING GTS


    1. Using the GTS, perform the Active Test.

      Click here

      Main Body
      Tester Display Measurement Item Control Range Diagnostic Note
      Taillight Relay Taillights and license plate light OFF or ON -
      OK
      Tail relay operates (taillights and license plate light turn on).
      Result
      Proceed to
      OK
      NG

    OK

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

    NG

  2. CHECK HARNESS AND CONNECTOR (TAILLIGHT CIRCUIT)


    • *1: for LHD

    • *2: for RHD

    • *3: w/o Entry and Start System

    • *4: w/ Entry and Start System


    1. Disconnect the 2Q*1, 2N*2 and 2K driver side junction block assembly connectors.

    2. Disconnect the R22 rear combination light assembly LH connector.

    3. Disconnect the R21 rear combination light assembly RH connector.

    4. Disconnect the z9 license plate light assembly connector.*3

    5. Disconnect the X6 luggage electrical key switch connector.*4

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      2K-1 - Body ground Always 11 to 14 V

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

      Standard Resistance
      for LHD
      Tester Connection Condition Specified Condition
      2Q-31 - R22-2 (TL) Always Below 1 Ω
      2Q-31 - Body ground Always 10 kΩ or higher
      for RHD
      Tester Connection Condition Specified Condition
      2N-9 - R22-2 (TL) Always Below 1 Ω
      2N-9 - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. CHECK DRIVER SIDE JUNCTION BLOCK ASSEMBLY


    1. Remove the driver side junction block assembly.

      Click here

      B001FFRC01
      *A for LHD *B for RHD
      *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 voltage according to the value(s) in the table below.

      Standard Voltage
      for LHD
      Tester Connection Condition Specified Condition
      2Q-31 - Battery negative (-) terminal Battery not connected to 2K-1 and A-14 (TRLY) Below 1 V

      Battery positive (+) → 2K-1

      Battery negative (-) → A-14 (TRLY)

      		 11 to 14 V
      for RHD
      Tester Connection Condition Specified Condition
      2N-9 - Battery negative (-) terminal Battery not connected to 2K-1 and A-14 (TRLY) Below 1 V

      Battery positive (+) → 2K-1

      Battery negative (-) → A-14 (TRLY)

      		 11 to 14 V
      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