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Bus Buffer ECU Communication Stop Mode: Procedure

  1. CHECK CAN BUS LINE FOR DISCONNECTION (ACCESSORY BUS BUFFER BRANCH WIRE) 
    1. Turn the ignition switch off.
      Fig 1: Checking CAN BUS Line For Disconnection (Accessory Bus Buffer Branch Wire)
      GTY158599Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Disconnect the C26 accessory bus buffer connector.
    3. Measure the resistance according to the value in the table below.

      Standard Resistance

      Tester Connection Switch Condition Specified Condition
      C26-1 (CAN+) - C26-2 (CAN-) Ignition switch off 54 to 69 Ω

    NG → REPAIR OR REPLACE CAN BRANCH WIRE CONNECTED TO ACCESSORY BUS BUFFER ((CAN-H, CAN-L)) 

    OK → CHECK ACCESSORY CIRCUIT