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 disable the SRS system.
2. CHECK FOR OPEN IN CAN BUS WIRE (BUS BUFFER ECU BRANCH WIRE) 
   1. Disconnect the H66 bus buffer ECU connector.
   2. Measure the resistance according to the value (s) in the table below.

      Standard Resistance 

      TESTER CONNECTION SPECIFIED CONDITION REFERENCE CHART
      
      

      Tester Connection	Switch Condition	Specified Condition
      H66-3 (CAN+) - H66-2 (CAN-)	Ignition switch off	54 to 69 Ω

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

   Fig 1: Identifying H66 Bus Buffer ECU Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   OK: REPLACE BUS BUFFER ECU