Section 704 (Can Communication System - Diagnostics): Precaution

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

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. The SOLARA 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 AIR BAG RESTRAINT SYSTEMS ).
WIRE HARNESS REPAIR
1. After repairing the wire bus line with solder, wrap the repaired part with vinyl tape.
  
  Fig 1: Precautions For Wrapping Repaired Part
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  NOTE:
  - The CANL bus line and CANH bus line must be installed together all the time.
    When installing, make sure to twist them. CAN bus lines are likely to be influenced by noise if the bus lines are not twisted.
  - The difference in length of the CANL bus line and CANH bus line should be within 100 mm (3.94 in.).
  - Untwisted parts around the connectors should be within 80 mm (3.15 in.).
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: Precautions For 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 Connector
  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 From Back Of Connector
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
When disconnecting the negative (-) battery terminal, initialize the following systems after the terminal is reconnected.

SYSTEM REFERENCE

System Name	Action
Power Window Control System	INITIALIZATION
Sliding Roof System	INITIALIZATION