CAN COMMUNICATION SYSTEM AFS ECU Communication Stop Mode

DESCRIPTION

Detection Item Symptom Trouble Area
AFS ECU Communication Stop Mode

Either condition is met:


  • "Headlight swivel (AFS)" is not displayed on the "Bus Check" screen.

  • "AFS ECU Communication Stop Mode" in "DTC Communication Table" applies.

  • Power source or inside of headlight swivel ECU assembly*1

  • Power source or inside of headlight leveling ECU assembly*2

  • Headlight swivel ECU assembly CAN branch wire or connector*1

  • Headlight leveling ECU assembly CAN branch wire or connector*2

  • Headlight swivel ECU assembly*1

  • Headlight leveling ECU assembly*2

WIRING DIAGRAM

A004O6CE04
w/ Adaptive Front-lighting System
*a No. 3 Junction Connector
*b ECU-IG NO.2
*c from IG1 Relay
*d Headlight Swivel ECU Assembly
A004THTE04
w/o Adaptive Front-lighting System
*a No. 3 Junction Connector
*b ECU-IG NO.2
*c from IG1 Relay
*d Headlight Leveling ECU Assembly

CAUTION / NOTICE / HINT

Note

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

Tech Tips

Operating the ignition switch, any switches or any doors triggers related ECU and sensor communication with the CAN, which causes resistance variation.

PROCEDURE


  1. PRECAUTION

    Note

    After turning the ignition switch off, waiting time may be required before disconnecting the cable from the battery terminal. Therefore, make sure to read the disconnecting the cable from the battery terminal notice before proceeding with work Click here.


    NEXT

  2. DISCONNECT CABLE FROM NEGATIVE BATTERY TERMINAL


    1. Disconnect the cable from the negative (-) battery terminal before measuring the resistances of the CAN main wire and the CAN branch wire.

      CAUTION:

      Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.

      Note

      When disconnecting the cable, some systems need to be initialized after the cable is reconnected Click here.


    NEXT

  3. CHECK FOR OPEN IN CAN BUS WIRE (HEADLIGHT ECU CAN BRANCH WIRE)


    1. w/ Adaptive Front-lighting System:


      1. A004TIEE02
        Text in Illustration
        *a

        Rear view of wire harness connector

        (to Headlight Swivel ECU Assembly)

        Disconnect the headlight swivel ECU assembly connector.

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

        Standard Resistance
        Tester Connection Switch Condition Specified Condition
        A38-12 (CANH) - A38-13 (CANL) Ignition switch off 54 to 69 Ω

    2. w/o Adaptive Front-lighting System:


      1. A004TQSE02
        Text in Illustration
        *a

        Front view of wire harness connector

        (to Headlight Leveling ECU Assembly)

        Disconnect the headlight leveling ECU assembly connector.

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

        Standard Resistance
        Tester Connection Switch Condition Specified Condition
        A82-6 (CANH) - A82-7 (CANL) Ignition switch off 54 to 69 Ω

    NG

    REPAIR OR REPLACE HEADLIGHT ECU CAN BRANCH WIRE OR CONNECTOR (CANH, CANL)

    OK

  4. CHECK HARNESS AND CONNECTOR (HEADLIGHT ECU - BATTERY AND BODY GROUND)


    1. w/ Adaptive Front-lighting System:


      1. A004QIQE02
        Text in Illustration
        *a

        Rear view of wire harness connector

        (to Headlight Swivel ECU Assembly)

        Connect the cable to the negative (-) battery terminal.

        Note

        When disconnecting the cable, some systems need to be initialized after the cable is reconnected Click here.

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

        Standard Voltage
        Tester Connection Switch Condition Specified Condition
        A38-14 (IGS) - Body ground Ignition switch ON 11 to 14 V
        A38-15 (IG) - Body ground Ignition switch ON 11 to 14 V

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

        Standard Resistance
        Tester Connection Condition Specified Condition
        A38-22 (E1) - Body ground Always Below 1 Ω

    2. w/o Adaptive Front-lighting System:


      1. A004ND1E02
        Text in Illustration
        *a

        Front view of wire harness connector

        (to Headlight Leveling ECU Assembly)

        Connect the cable to the negative (-) battery terminal.

        Note

        When disconnecting the cable, some systems need to be initialized after the cable is reconnected Click here.

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

        Standard Voltage
        Tester Connection Switch Condition Specified Condition
        A82-1 (IG) - Body ground Ignition switch ON 11 to 14 V

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

        Standard Resistance
        Tester Connection Condition Specified Condition
        A82-9 (E1) - Body ground Always Below 1 Ω
      Result
      Result Proceed to
      OK (w/ Adaptive Front-lighting System) A
      OK (for LHD, w/o Adaptive Front-lighting System) B
      OK (for RHD, w/o Adaptive Front-lighting System) C
      NG D

    A

    REPLACE HEADLIGHT SWIVEL ECU ASSEMBLY Click here

    B

    REPLACE HEADLIGHT LEVELING ECU ASSEMBLY Click here

    C

    REPLACE HEADLIGHT LEVELING ECU ASSEMBLY Click here

    D

    REPAIR OR REPLACE HARNESS OR CONNECTOR