LIGHTING SYSTEM Taillight Circuit

DESCRIPTION

Front lights:

The front controller controls the operation of the FR TAIL relay. The FR TAIL relay turns on the parking lights.

The front controller receives parking light ON request signal from the combination switch ECU through BEAN communication and activates the FR TAIL relay.

The FR TAIL relay is built into the front controller, so unlike conventional relays, it cannot be removed for inspection.

Rear lights:

The main body ECU RH controls the operation of the TAIL relay. The TAIL relay turns on the taillights and license plate lights.

The main body ECU RH receives taillight and license plate light ON request signals from the combination switch ECU through BEAN communication and activates the TAIL relay.

The TAIL relay is built into the cowl side junction block LH, so unlike conventional relays, it cannot be removed for inspection.

WIRING DIAGRAM

A015Z4PE03
A0160L3E01

INSPECTION PROCEDURE

PROCEDURE


  1. CHECK TAILLIGHT (OPERATION)


    1. Turn the engine switch on (IG).

    2. When the taillight switch is operated, check that the following lights illuminate.

      Tech Tips


      • The front lights (parking lights) share the same drive circuit. Therefore, if one of the front lights does not come on, there may be a problem in the circuit between the FR TAIL relay and bulb, or the circuit between the bulb and body ground. Inspect those circuits to identify the problem.

      • The rear lights (taillights and license plate lights) share the same drive circuit. Therefore, if one of the rear lights does not come on, there may be a problem in the circuit between the TAIL relay and the bulb or LED, or the circuit between the bulb or LED and body ground. Inspect those circuits to identify the problem.

      Result
      Result Proceed to
      Neither front nor rear lights illuminate A
      Front lights (parking lights) do not illuminate B
      Rear lights (taillights and license plate lights) do not illuminate C

    B

    PERFORM ACTIVE TEST USING INTELLIGENT TESTER Click here

    C

    PERFORM ACTIVE TEST USING INTELLIGENT TESTER Click here

    A

    PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE Click here

  2. PERFORM ACTIVE TEST USING INTELLIGENT TESTER


    1. Connect the intelligent tester to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the intelligent tester on.

    4. Enter the following menus: Body / Body No. 5 / Active Test.

    5. Check the operation.

      Body No. 5 (Front Controller)
      Tester Display Test Part Control Range Diagnostic Note
      Clearance Light Operation Clearance light (Parking lights) ON/OFF -
      OK
      Parking lights illuminate.

    NG

    CHECK HARNESS AND CONNECTOR (HEADLIGHT ASSEMBLY - BODY GROUND) Click here

    OK

    REPLACE FRONT CONTROLLER (MULTIPLEX NETWORK BODY ECU)

  3. CHECK HARNESS AND CONNECTOR (HEADLIGHT ASSEMBLY - BODY GROUND)

    Tech Tips

    Perform the following inspection on either the LH or RH side.


    1. A015YZEE33

      Disconnect the B2 or B12 headlight assembly connector.

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

      Standard Resistance
      RH side
      Tester Connection Condition Specified Condition
      B2-8 (E) - Body ground Always Below 1 Ω
      LH side
      Tester Connection Condition Specified Condition
      B12-8 (E) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. CHECK HARNESS AND CONNECTOR (HEADLIGHT ASSEMBLY - FRONT CONTROLLER)

    Tech Tips

    Perform the following inspection on either the LH or RH side.


    1. A015YZEE34

      Disconnect the B2 or B12 headlight assembly connector.

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

      Standard Voltage
      RH Side
      Tester Connection Condition Specified Condition
      B2-7 (B) - Body ground Light control switch off Below 1 V
      B2-7 (B) - Body ground Light control switch in TAIL 11 to 14 V
      LH Side
      Tester Connection Condition Specified Condition
      B12-7 (B) - Body ground Light control switch off Below 1 V
      B12-7 (B) - Body ground Light control switch in TAIL 11 to 14 V

    NG

    CHECK HARNESS AND CONNECTOR (HEADLIGHT ASSEMBLY - FRONT CONTROLLER) Click here

    OK

    REPLACE HEADLIGHT ASSEMBLY Click here

  5. CHECK HARNESS AND CONNECTOR (HEADLIGHT ASSEMBLY - FRONT CONTROLLER)

    Tech Tips

    Perform the following inspection on either the LH or RH side.


    1. A015ZDYE11

      Disconnect the B2 or B12 headlight assembly connector.

    2. Disconnect the 2G front controller connector.

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

      Standard Resistance
      RH Side
      Tester Connection Condition Specified Condition
      B2-7 (B) - 2G-8 Always Below 1 Ω
      B2-7 (B) - Body ground Always 10 kΩ or higher
      LH Side
      Tester Connection Condition Specified Condition
      B12-7 (B) - 2G-9 Always Below 1 Ω
      B12-7 (B) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE FRONT CONTROLLER (MULTIPLEX NETWORK BODY ECU)

  6. PERFORM ACTIVE TEST USING INTELLIGENT TESTER


    1. Connect the intelligent tester to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the intelligent tester on.

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

    5. Check the operation.

      Body (Main Body ECU RH)
      Tester Display Test Part Control Range Diagnostic Note
      Tail Light Taillights (taillights and license plate lights) ON/OFF -
      OK
      Taillights and license plate lights.
      Result
      Result Proceed to
      Inner taillights (rear light assembly) do not illuminate A
      Outer taillights (rear combination light assembly) do not illuminate B
      License plate lights do not illuminate C
      All rear lights illuminate D
      All rear lights do not illuminate E

    B

    CHECK HARNESS AND CONNECTOR (REAR COMBINATION LIGHT ASSEMBLY - BODY GROUND) Click here

    C

    CHECK HARNESS AND CONNECTOR (LICENSE PLATE LIGHT ASSEMBLY LH - BODY GROUND) Click here

    D

    REPLACE MAIN BODY ECU RH (COWL SIDE JUNCTION BLOCK RH)

    E

    CHECK HARNESS AND CONNECTOR (MAIN BODY ECU RH - BATTERY) Click here

    A

  7. CHECK HARNESS AND CONNECTOR (REAR LIGHT ASSEMBLY - BODY GROUND)

    Tech Tips

    Perform the following inspection on either the LH or RH side.


    1. A0162N1E01

      Disconnect the Q46 or Q40 rear light assembly connector.

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

      Standard Resistance
      RH Side
      Tester Connection Condition Specified Condition
      Q46-3 - Body ground Always Below 1 Ω
      LH Side
      Tester Connection Condition Specified Condition
      Q40-3 - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  8. CHECK HARNESS AND CONNECTOR (REAR LIGHT ASSEMBLY - MAIN BODY ECU LH)

    Tech Tips

    Perform the following inspection on either the LH or RH side.


    1. A0162N1E01

      Disconnect the Q46 or Q40 rear light assembly connector.

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

      Standard Voltage
      RH Side
      Tester Connection Condition Specified Condition
      Q46-1 - Body ground Light control switch off Below 1 V
      Q46-1 - Body ground Light control switch in TAIL 11 to 14 V
      LH Side
      Tester Connection Condition Specified Condition
      Q40-1 - Body ground Light control switch off Below 1 V
      Q40-1 - Body ground Light control switch in TAIL 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE REAR LIGHT ASSEMBLY Click here

  9. CHECK HARNESS AND CONNECTOR (REAR COMBINATION LIGHT ASSEMBLY - BODY GROUND)

    Tech Tips

    Perform the following inspection on either the LH or RH side.


    1. A0161FKE01

      Disconnect the Q51 or Q50 rear combination light assembly connector.

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

      Standard Resistance
      RH Side
      Tester Connection Condition Specified Condition
      Q51-6 (E) - Body ground Always Below 1 Ω
      LH Side
      Tester Connection Condition Specified Condition
      Q50-6 (E) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  10. CHECK HARNESS AND CONNECTOR (REAR COMBINATION LIGHT ASSEMBLY - MAIN BODY ECU LH)

    Tech Tips

    Perform the following inspection on either the LH or RH side.


    1. A0161FKE01

      Disconnect the Q51 or Q50 rear combination light assembly connector.

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

      Standard Voltage
      RH Side
      Tester Connection Condition Specified Condition
      Q51-3 - Body ground Light control switch off Below 1 V
      Q51-3 - Body ground Light control switch in TAIL 11 to 14 V
      LH Side
      Tester Connection Condition Specified Condition
      Q50-3 - Body ground Light control switch off Below 1 V
      Q50-3 - Body ground Light control switch in TAIL 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE REAR COMBINATION LIGHT ASSEMBLY Click here

  11. CHECK HARNESS AND CONNECTOR (LICENSE PLATE LIGHT ASSEMBLY LH - BODY GROUND)

    Tech Tips

    Perform the following inspection on the LH side.


    1. A0162OYE01

      Disconnect the Q47 license plate light assembly LH connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      Q47-2 (E) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  12. CHECK HARNESS AND CONNECTOR (LICENSE PLATE LIGHT ASSEMBLY LH - MAIN BODY ECU LH)

    Tech Tips

    Perform the following inspection on the LH side.


    1. A0162OYE03

      Disconnect the Q47 license plate light assembly LH connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      Q47-1 (B) - Body ground Light control switch off Below 1 V
      Q47-1 (B) - Body ground Light control switch in TAIL 11 to 14 V

    NG

    CHECK HARNESS AND CONNECTOR (LICENSE PLATE LIGHT ASSEMBLY RH - MAIN BODY ECU LH) Click here

    OK

    REPLACE LICENSE PLATE LIGHT ASSEMBLY LH Click here

  13. CHECK HARNESS AND CONNECTOR (LICENSE PLATE LIGHT ASSEMBLY RH - MAIN BODY ECU LH)

    Tech Tips

    Perform the following inspection on the RH side.


    1. A0162OYE02

      Disconnect the Q44 license plate light assembly RH connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      Q44-1 (B) - Body ground Light control switch off Below 1 V
      Q44-1 (B) - Body ground Light control switch in TAIL 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  14. CHECK HARNESS AND CONNECTOR (LICENSE PLATE LIGHT ASSEMBLY LH - LIGHT ASSEMBLY RH)


    1. A0162OYE04

      Disconnect the Q44 license plate light assembly RH connector.

    2. Disconnect the Q47 license plate light assembly LH connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      Q44-2 (E) - Q47-1 (B) Always Below 1 Ω
      Q44-2 (E) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE LICENSE PLATE LIGHT ASSEMBLY RH Click here

  15. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU RH - BATTERY)


    1. A015ZHBE02

      Disconnect the RD main body ECU RH connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      RD-1 (TRLY) - Body ground Always 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  16. INSPECT MAIN BODY ECU RH (COWL SIDE JUNCTION BLOCK RH)


    1. A0163K6E01

      Connect the RD main body ECU RH connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      RD-1 (TRLY) - Body ground Light control switch off Below 1 V
      RD-1 (TRLY) - Body ground Light control switch in TAIL 11 to 14 V

    NG

    REPLACE MAIN BODY ECU RH (COWL SIDE JUNCTION BLOCK RH)

    OK

  17. INSPECT MAIN BODY ECU LH (COWL SIDE JUNCTION BLOCK LH)


    1. A016344E01

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      LJ-24 - Body ground Light control switch off Below 1 V
      LJ-24 - Body ground Light control switch in TAIL 11 to 14 V

    NG

    REPLACE MAIN BODY ECU LH (COWL SIDE JUNCTION BLOCK LH)

    OK

    REPAIR OR REPLACE HARNESS OR CONNECTOR (MAIN BODY ECU LH - EACH REAR LIGHT)