Section 476 (Can Communication System - Diagnostics): Precaution

WARNING: This page is about a different car, the 2004 Toyota RAV4. However, it is still accessible from the selected car via links, so may be relevant.

WIRE HARNESS REPAIR
1. When repairing a wire harness, wrap the repaired part with a vinyl tape.
  
  Fig 1: Wrapping Repaired Part Of Wire Harness With Vinyl Tape
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  NOTE:
  - The CANL wire harness and CANH wire harness must be installed together all the time.
    When installing, make sure to twist them.
  - The difference in the length of the CANL wire harness and CANH wire harness should be within 100 mm (3.93 in.).
2. Do not perform the bypass wiring between the connectors.
  NOTE: If you perform the bypass wiring, the characteristic of the twisted wire harness will be lost.
  
  Fig 2: Avoiding Performing Bypass Wiring Between Connectors
  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: Inserting Tester Probes Into Back Of Connector
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. If it is impossible to measure the resistance from the back of the connector, use a repair wire to measure it.
  
  Fig 4: Using Repair Wire To Measure Resistance
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002