CAN COMMUNICATION SYSTEM(for LHD), Diagnostic DTC:U1117, B2779

DTC Code DTC Name
U1117 Lost Communication with Accessory Gateway
B2779 Engine Starter Communication Malfunction

DESCRIPTION

DTC Code DTC Detection Condition Trouble Area
U1117 There is no communication from the accessory bus buffer

  • Accessory bus buffer CAN branch wire or connector

  • Accessory bus buffer
B2779 There is no communication from the accessory bus buffer

  • Accessory bus buffer CAN branch wire or connector

  • Accessory bus buffer

WIRING DIAGRAM

A01X3I9E02
*a No. 9 Junction Connector
*b Accessory Bus Buffer

CAUTION / NOTICE / HINT

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 main wire and the branch wire.

      CAUTION:

      For vehicles with an SRS 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

  3. CHECK FOR OPEN IN CAN BUS WIRE (ACCESSORY BUS BUFFER CAN BRANCH WIRE)


    1. A01X6DME02
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Accessory Bus Buffer)

      Disconnect the E6 accessory bus buffer connector.

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      E6-1 (CAN+) - E6-2 (CAN-) Ignition switch off 54 to 69 Ω

    OK

    REPLACE ACCESSORY BUS BUFFER

    NG

    REPAIR OR REPLACE ACCESSORY BUS BUFFER CAN BRANCH WIRE OR CONNECTOR (CAN+, CAN-)