Information Bus: Service Precautions

CAN COMMUNICATION: CAN COMMUNICATION SYSTEM: PRECAUTION

1. IGNITION SWITCH EXPRESSION

HINT
The type of ignition switch used on this model differs according to the specifications of the vehicle. The expressions listed in the table below are used in this section.





2. PRECAUTION

(a) Turn the ignition switch off before measuring the resistance of the main wire and the branch wire.

(b) After the ignition switch is turned off, check that the key reminder warning system and light reminder warning system are not in operation.

(c) Before measuring the resistance, leave the vehicle for at least 1 minute and do not operate the ignition switch, any switches or doors. If doors need to be opened in order to check connectors, open the doors and leave them open.

HINT
Operating the ignition switch, any switches or any doors triggers related ECU and sensor communication with the CAN, which causes resistance variation.

3. STEERING SYSTEM HANDLING PRECAUTIONS

(a) Care must be taken when replacing parts. Incorrect replacement could affect the performance of the steering system and result in hazards when driving.

4. SRS AIRBAG SYSTEM HANDLING PRECAUTIONS

(a) This vehicle is equipped with an SRS (Supplemental Restraint System), which includes components 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 installation/removal, inspection and replacement of parts), be sure to read the precautionary notice for the Supplemental Restraint System Service Precautions.

5. BUS LINE REPAIR





(a) After repairing the bus line with solder, wrap the repaired part with vinyl tape Electronic Circuit Inspection Procedure.

NOTICE:
* The CANL bus line and CANH bus line must be installed together.
* When installing, twist the CANL and CANH bus line together.
* CAN bus lines are likely to be influenced by noise if the bus lines are not twisted together.
* The difference in length between the CANL bus line and CANH bus line should be less than 100 mm (3.937 in.).
* Leave approximately 80 mm (3.150 in.) loose in the twisted wires around the connectors.





(b) Do not use bypass wiring between the connectors.

NOTICE:
The ability of the twisted wire harness to resist interference will be lost if bypass wiring is used.

6. CONNECTOR HANDLING





(a) When inserting tester probes into a connector, insert them from the rear of the connector.





(b) Use a repair wire to check the connector if it is impossible to check resistance from the rear of the connector.