Can Communication System: Precaution

DISCONNECT CABLE FROM NEGATIVE BATTERY TERMINAL
CAUTION: Wait for 90 seconds after disconnecting the cable to prevent the airbag working.
1. Be careful when replacing parts. Incorrect replacement could affect the performance of the steering system and result in hazardous driving.
STEERING SYSTEM HANDLING PRECAUTIONS
1. Be careful when replacing parts. Incorrect replacement could affect the performance of the steering system and result in hazardous driving.
SRS AIRBAG SYSTEM HANDLING PRECAUTIONS
1. This vehicle is equipped with an SRS (Supplemental Restraint System) which includes parts 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 SRS (See AIRBAG SYSTEM ).
BUS WIRE REPAIR
1. After repairing a bus wire with solder, wrap the repaired part with electrical tape.
  NOTE:
  - The CANL bus wire and CANH bus wire must be installed together at all times.
  - When installing, make sure that the wires are twisted.
  - CAN bus wires are likely to be influenced by electrical noise if the bus wires are not twisted.
  - The difference in length between the CANL bus wire and CANH bus wire should be 100 mm (3.937 in.) or less.
  - Leave approximately 80 mm (3.150 in.) loose in the twisted wires around the connector.
    
    Fig 1: Identifying Bus Line Repair Area
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Do not use bypass wiring between the connectors.
  NOTE: The ability of the twisted bus wires to resist interference will be lost if bypass wiring is used.
  
  Fig 2: Caution For Bypass Wiring Between Connectors
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
CONNECTOR HANDLING
1. When checking resistance with a tester, insert the tester probes from the backside (harness side) of the connector.
  
  Fig 3: Checking Connector Resistance Using Tester
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Use service wires to check the connector if it is impossible to check continuity from the rear of the connector.
  
  Fig 4: Checking Connector Continuity Using Service Wires
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
PRECAUTIONS FOR INSPECTING OR REPLACING CAN JUNCTION CONNECTOR
1. If the CAN junction connector is removed from the vehicle for inspection or replacement, make sure to install the CAN junction connector and all wire harnesses to their original locations with tape and the clamps.