Can Communication System: Precaution

1. STEERING SYSTEM HANDLING PRECAUTIONS 
   1. Care must be taken when replacing parts. Incorrect replacement could affect the performance of the steering system and result in hazardous driving.
2. SRS AIRBAG SYSTEM HANDLING PRECAUTIONS 
   1. This vehicle is equipped with an SRS

      (Supplemental Restraint System) which includes components such as the driver airbag and front passenger airbag. Failure to carry out service operations in the correct sequence could cause unexpected SRS deployment during servicing and may lead to a serious accident. Before servicing (including removal or installation of parts, inspection or replacement), be sure to read the precautionary notice for the Supplemental Restraint System (See PRECAUTION ).

3. BUS LINE REPAIR 
   1. After repairing the bus line with solder, wrap the repaired part with electrical tape.
      Fig 1: Identifying Bus Line Repair Area

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      NOTE:

      • The CANL bus line and CANH bus line must be installed together all the times.
      • When installing, make sure to twist them.
      • CAN bus lines are likely to be influenced by electrical noise if they are not twisted.
      • The difference in length between the CANL bus line and CANH bus line should be 100 mm (3.937 in.) or less.
      • Leave approximately 80 mm (3.150 in.) loose in the twisted wires around the connector.
   2. Do not use bypass wiring between the connectors.
      Fig 2: Precaution For Bypassing Wiring Between Connectors

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      NOTE: The ability of the twisted bus lines to resist interference will be lost if bypass wiring is used.
4. CONNECTOR HANDLING 
   1. When checking resistance with a tester, insert the tester probes from the backside (harness side) of the connector.
      Fig 3: Inserting Tester Probes From Backside Of Connector

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   2. Use a service wire to check the connector if it is impossible to check continuity from the rear of the connector.
5. PRECAUTION FOR DISCONNECTING THE BATTERY TERMINAL 
   NOTE:

   • When disconnecting the negative (-) battery terminal, initialize the following systems after the terminal is reconnected.
     Fig 4: Checking Continuity From Rear Of Connector

     Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
     SYSTEM NAME REFERENCE TABLE
     
     

     System Name	See procedure
     Power Window Control System	INITIALIZATION

   • Perform the RESET MEMORY (AT initialization) operation after replacing the automatic transmission assembly, engine assembly, or ECM.

HINT:

RESET MEMORY cannot be completed by disconnecting the battery terminal.