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 "Bus Check".

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

  • Power source or inside headlight leveling ECU assembly

  • Headlight leveling ECU assembly CAN branch wire or connector

  • Headlight leveling ECU assembly

WIRING DIAGRAM

A01BBHYE01

INSPECTION PROCEDURE

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. 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:

      For vehicles with an airbag system:

      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

  2. CHECK FOR OPEN IN CAN BUS WIRE (HEADLIGHT LEVELING ECU ASSEMBLY CAN BRANCH WIRE)


    1. A01BGDVE17
      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
      A39-6 (CANH) - A39-7 (CANL) Ignition switch off 54 to 69 Ω

    NG

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

    OK

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


    1. A01BGDVE18
      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 resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      A39-9 (E1) - Body ground Always Below 1 Ω

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      A39-1 (IG) - Body ground Ignition switch ON 11 to 14 V
      Result
      Result Proceed to
      OK (for LHD) A
      OK (for RHD) B
      NG C

    B

    REPLACE HEADLIGHT LEVELING ECU ASSEMBLY Click here

    C

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    A

    REPLACE HEADLIGHT LEVELING ECU ASSEMBLY Click here