LIGHTING SYSTEM Taillight Circuit

DESCRIPTION

The main body ECU receives a light control switch information signal from the headlight dimmer switch, and illuminates the taillights, front clearance lights and license plate lights.

WIRING DIAGRAM

A0055BNE03

CAUTION / NOTICE / HINT

Note


  • Recognition code registration is necessary when replacing the main body ECU (instrument panel junction block assembly).

  • If the main body ECU (instrument panel junction block assembly) is replaced, refer to the Service Bulletin.

  • As the door control battery is installed between the vehicle battery and main body ECU (instrument panel junction block assembly), first perform the inspections in On-Vehicle Inspection to confirm that there are no malfunctions in the power source circuit for the main body ECU (instrument panel junction block assembly) before performing this troubleshooting procedure.

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 (TAILLIGHT 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 / Main Body / Active Test / Tail Light.

    5. Check that the taillights, front clearance lights and license plate lights turn on/off.

      Main Body
      Tester Display Test Part Control Range Diagnostic Note
      Taillight Relay Taillight ON or OFF -
      OK
      Taillights, front clearance lights and license plate lights turn on/off.
      Result
      Result Proceed to
      OK A
      NG (Taillights, front clearance lights and license plate lights do not turn on) B
      NG (Front clearance lights do not turn on) C
      NG (Taillights and license plate lights do not turn on) D

    A

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

    C

    INSPECT MAIN BODY ECU (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY) Click here

    D

    INSPECT MAIN BODY ECU (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY) Click here

    B

  2. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU [INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY] - BATTERY)


    1. A0055TKE02
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Main Body ECU [Instrument Panel Junction Block Assembly])

      Disconnect the DG main body ECU (instrument panel junction block assembly) connector.

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

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

    OK

    REPLACE MAIN BODY ECU (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY)

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  3. INSPECT MAIN BODY ECU (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY)


    1. A0052GYE02
      Text in Illustration
      *a

      Component with harness connected

      (Main Body ECU [Instrument Panel Junction Block Assembly])

      Remove the main body ECU (instrument panel junction block assembly) with its connector still connected.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      DB-15 (TRLY) - Body Ground

      Light control switch

      off → TAIL

      		 Below 1 V → 11 to 14 V
      DB-33 (TRLY) - Body Ground

      Light control switch

      off → TAIL

      		 Below 1 V → 11 to 14 V

    NG

    REPLACE MAIN BODY ECU (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY)

    OK

  4. CHECK HARNESS AND CONNECTOR (HEADLIGHT ASSEMBLY [FRONT CLEARANCE LIGHT] - MAIN BODY ECU AND BODY GROUND)


    1. A0058WGE02
      Text in Illustration
      *A for LH
      *B for RH
      *a

      Front view of wire harness connector

      (to Headlight Assembly)

      for LH:


      1. Disconnect the A61 headlight assembly connector.

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

        Standard Voltage
        Tester Connection Switch Condition Specified Condition
        A61-4 (B) - Body ground

        Light control switch

        TAIL

        		 11 to 14 V
        Standard Resistance
        Tester Connection Condition Specified Condition
        A61-1 (E) - Body Ground Always Below 1 Ω

    2. for RH:


      1. Disconnect the A60 headlight assembly connector.

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

        Standard Voltage
        Tester Connection Switch Condition Specified Condition
        A60-4 (B) - Body ground

        Light control switch

        TAIL

        		 11 to 14 V
        Standard Resistance
        Tester Connection Condition Specified Condition
        A60-1 (E) - Body Ground Always Below 1 Ω

    OK

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

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  5. INSPECT MAIN BODY ECU (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY)


    1. A00544RE02
      Text in Illustration
      *a

      Component with harness connected

      (Main Body ECU [Instrument Panel Junction Block Assembly] [Side View])

      Remove the main body ECU (instrument panel junction block assembly) with its connector still connected.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      DA-29 (TRLY) - Body Ground

      Light control switch

      off → TAIL

      		 Below 1 V → 11 to 14 V

    NG

    REPLACE MAIN BODY ECU (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY)

    OK

  6. CHECK HARNESS AND CONNECTOR (REAR COMBINATION LIGHT ASSEMBLY [TAILLIGHT] - MAIN BODY ECU AND BODY GROUND)


    1. A0052HNE02
      Text in Illustration
      *A for LH
      *B for RH
      *a

      Front view of wire harness connector

      (to Rear Combination Light Assembly)

      for LH:


      1. Disconnect the G6 rear combination light assembly connector.

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

        Standard Voltage
        Tester Connection Switch Condition Specified Condition
        G6-1 (B) - Body ground

        Light control switch

        TAIL

        		 11 to 14 V
        Standard Resistance
        Tester Connection Condition Specified Condition
        G6-4 (E) - Body ground Always Below 1 Ω

    2. for RH:


      1. Disconnect the G5 rear combination light assembly connector.

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

        Standard Voltage
        Tester Connection Switch Condition Specified Condition
        G5-1 (B) - Body ground

        Light control switch

        TAIL

        		 11 to 14 V
        Standard Resistance
        Tester Connection Condition Specified Condition
        G5-4 (E) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  7. CHECK HARNESS AND CONNECTOR (REAR LIGHT ASSEMBLY [TAILLIGHT] - MAIN BODY ECU AND BODY GROUND)


    1. A005309E02
      Text in Illustration
      *A for LH
      *B for RH
      *a

      Front view of wire harness connector

      (to Rear Light Assembly [for Sedan])
      *b

      Front view of wire harness connector

      (to Rear Light Assembly [for Wagon])

      for Sedan (LH Side):


      1. Disconnect the G55 rear light assembly connector.

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

        Standard Voltage
        Tester Connection Switch Condition Specified Condition
        G55-3 (B) - Body ground

        Light control switch

        TAIL

        		 11 to 14 V
        Standard Resistance
        Tester Connection Condition Specified Condition
        G55-1 (E) - Body ground Always Below 1 Ω

    2. for Sedan (RH Side):


      1. Disconnect the G54 rear light assembly connector.

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

        Standard Voltage
        Tester Connection Switch Condition Specified Condition
        G54-3 (B) - Body ground

        Light control switch

        TAIL

        		 11 to 14 V
        Standard Resistance
        Tester Connection Condition Specified Condition
        G54-1 (E) - Body ground Always Below 1 Ω

    3. for Wagon (LH Side):


      1. Disconnect the M15 rear light assembly connector.

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

        Standard Voltage
        Tester Connection Switch Condition Specified Condition
        M15-3 (B) - Body ground

        Light control switch

        TAIL

        		 11 to 14 V
        Standard Resistance
        Tester Connection Condition Specified Condition
        M15-1 (E) - Body ground Always Below 1 Ω

    4. for Wagon (RH Side):


      1. Disconnect the M16 rear light assembly connector.

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

        Standard Voltage
        Tester Connection Switch Condition Specified Condition
        M16-3 (B) - Body ground

        Light control switch

        TAIL

        		 11 to 14 V
        Standard Resistance
        Tester Connection Condition Specified Condition
        M16-1 (E) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  8. CHECK HARNESS AND CONNECTOR (REAR LICENSE PLATE LIGHT ASSEMBLY - MAIN BODY ECU AND BODY GROUND)


    1. A00531RE02
      Text in Illustration
      *A for LH
      *B for RH
      *a

      Front view of wire harness connector

      (to Rear License Plate Light Assembly [for Sedan])
      *b

      Front view of wire harness connector

      (to Rear License Plate Light Assembly [for Wagon])

      for Sedan (LH Side):


      1. Disconnect the G57 rear license plate light assembly connector.

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

        Standard Voltage
        Tester Connection Switch Condition Specified Condition
        G57-1 - Body ground

        Light control switch

        TAIL

        		 11 to 14 V
        Standard Resistance
        Tester Connection Condition Specified Condition
        G57-2 - Body ground Always Below 1 Ω

    2. for Sedan (RH Side):


      1. Disconnect the G56 rear license plate light assembly connector.

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

        Standard Voltage
        Tester Connection Switch Condition Specified Condition
        G56-1 - Body ground

        Light control switch

        TAIL

        		 11 to 14 V
        Standard Resistance
        Tester Connection Condition Specified Condition
        G56-2 - Body ground Always Below 1 Ω

    3. for Wagon (LH Side):


      1. Disconnect the M17 rear license plate light assembly connector.

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

        Standard Voltage
        Tester Connection Switch Condition Specified Condition
        M17-1 - Body ground

        Light control switch

        TAIL

        		 11 to 14 V
        Standard Resistance
        Tester Connection Condition Specified Condition
        M17-2 - Body ground Always Below 1 Ω

    4. for Wagon (RH Side):


      1. Disconnect the M18 rear license plate light assembly connector.

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

        Standard Voltage
        Tester Connection Switch Condition Specified Condition
        M18-1 - Body ground

        Light control switch

        TAIL

        		 11 to 14 V
        Standard Resistance
        Tester Connection Condition Specified Condition
        M18-2 - Body ground Always Below 1 Ω

    OK

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

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR