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

A004MOCE04

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 / Taillight Relay.

    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. A004UCDE02
      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. A004N7CE02
      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. A004SO4E02
      Text in Illustration
      *A for LH
      *B for RH
      *a

      Front view of wire harness connector

      (to Headlight Assembly [for Halogen Headlight])
      *b

      Front view of wire harness connector

      (to Headlight Assembly [for LED Headlight])

      for LH (for Halogen Headlight):


      1. Disconnect the A71 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
        A71-4 (B) - Body ground

        Light control switch

        TAIL

        		 11 to 14 V
        Standard Resistance
        Tester Connection Condition Specified Condition
        A71-1 (E) - Body ground Always Below 1 Ω

    2. for RH (for Halogen Headlight):


      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
        A70-4 (B) - Body ground

        Light control switch

        TAIL

        		 11 to 14 V
        Standard Resistance
        Tester Connection Condition Specified Condition
        A70-1 (E) - Body ground Always Below 1 Ω

    3. for LH (for LED Headlight):


      1. Disconnect the A77 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
        A77-4 (B) - Body ground

        Light control switch

        TAIL

        		 11 to 14 V
        Standard Resistance
        Tester Connection Condition Specified Condition
        A77-3 (E) - Body ground Always Below 1 Ω

    4. for RH (for LED Headlight):


      1. Disconnect the A76 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
        A76-4 (B) - Body ground

        Light control switch

        TAIL

        		 11 to 14 V
        Standard Resistance
        Tester Connection Condition Specified Condition
        A76-3 (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. A004PSNE02
      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. A004S7YE02
      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. A004MK0E02
      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 G58 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
        G58-3 (B) - Body ground

        Light control switch

        TAIL

        		 11 to 14 V
        Standard Resistance
        Tester Connection Condition Specified Condition
        G58-1 (E) - Body ground Always Below 1 Ω

    2. for Sedan (RH Side):


      1. Disconnect the G57 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
        G57-3 (B) - Body ground

        Light control switch

        TAIL

        		 11 to 14 V
        Standard Resistance
        Tester Connection Condition Specified Condition
        G57-1 (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. A004QOVE02
      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 G60 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
        G60-1 - Body ground

        Light control switch

        TAIL

        		 11 to 14 V
        Standard Resistance
        Tester Connection Condition Specified Condition
        G60-2 - Body ground Always Below 1 Ω

    2. for Sedan (RH Side):


      1. Disconnect the G59 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
        G59-1 - Body ground

        Light control switch

        TAIL

        		 11 to 14 V
        Standard Resistance
        Tester Connection Condition Specified Condition
        G59-2 - 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