Can Communication System - Diagnostics: Precaution

HANDLING PRECAUTIONS ON STEERING SYSTEM
1. Care must be taken when replacing parts. Incorrect replacement could affect the performance of the steering system and result in hazardous driving.
HANDLING PRECAUTIONS ON SRS AIRBAG SYSTEM
1. This vehicle is equipped with an SRS (Supplemental Restraint System), such as the driver airbag and front passenger airbag. Failure to carry out service operation in the correct sequence could cause the SRS to unexpectedly deploy during servicing, possibly leading 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 SUPPLEMENTAL RESTRAINT SYSTEM ).
WIRE HARNESS REPAIR
1. After repairing the wire bus line with solder, wrap the repaired part with vinyl tape.
  NOTE:
  - The CANL bus line and CANH bus line must be installed together all the time.
    When installing, make sure to twist them.
  - The difference in length of the CANL bus line and CANH bus line should be within 100 mm (3.93 in.).
  - Untwisted parts around the connector should be within 80 mm (3.15 in.).
  Fig 1: Wrapping Repaired Part With Vinyl Tape
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Do not perform bypass wiring between the connectors.
NOTE: If you perform bypass wiring, the characteristic of the twisted wire harness will be lost.

Fig 2: Locating Bypass Wire
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
CONNECTOR HANDLING
1. When inserting tester probes into a connector, insert them from the back of the connector.
  
  Fig 3: Identifying Connector Handling
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. If it is impossible to check resistance from the back of the connector, use a repair wire to check it.
Fig 4: Checking Resistance
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002