Can Communication System: Precaution

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.
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 PRECAUTION ).
BUS WIRE REPAIR

Fig 1: Repairing Wire Bus Line With Solder
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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 they 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.
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: Precaution 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: Inserting Tester Probes From Backside (Harness Side) Of Connector
  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 Continuity From Rear Of Connector
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.