Section 12 (Can Communication System - Diagnostics): Precaution

WARNING: This page is about a different car, the 2005 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.
  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.).
  Fig 1: Wrapping Repaired Part With Vinyl Tape
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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: Precaution For Perform 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 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