Inspection Procedure

HINT:

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

1. 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: Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to prevent airbag and seat belt pretensioner activation.
      NOTE: After the ignition switch is turned OFF, the navigation system requires approximately 90 seconds to record various types of memory and settings. As a result, after turning the ignition switch OFF, wait 90 seconds or more before disconnecting the cable from the negative (-) battery terminal.
2. CHECK FOR OPEN IN CAN BUS WIRE (BUS BUFFER ECU BRANCH WIRE) 
   1. Disconnect the J59 bus buffer ECU connector.
   2. Measure the resistance according to the value(s) in the table below.

      Standard resistance 

      STANDARD RESISTANCE SPECIFICATION TABLE
      
      

      Tester Connection	Switch Condition	Specified Condition
      J59-3 (CAN+) - J59-2 (CAN-)	Ignition switch OFF	54 to 69 Ω

      Fig 1: Identifying J59 Bus Buffer ECU Connector Terminals

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   NG: REPAIR OR REPLACE BUS BUFFER ECU BRANCH WIRE OR CONNECTOR (CAN+, CAN-) 

   OK: REPLACE BUS BUFFER ECU