RM35X0E _57 Power Source / Network _078518 NETWORKING _0381088 CAN COMMUNICATION SYSTEM L

NETWORKING  CAN COMMUNICATION SYSTEM  PRECAUTION  


CAN COMMUNICATION SYSTEM TROUBLESHOOTING


a.

Because the order of diagnosis is important to allow correct diagnosis, make sure to begin troubleshooting using How to Proceed with Troubleshooting when CAN communication system related DTCs are output.

Click herePower Source / Network>NETWORKING>CAN COMMUNICATION SYSTEM>HOW TO PROCEED WITH TROUBLESHOOTING


b.

Precaution for steering system handling (w/ Variable Flow Control Solenoid Valve)

i.

Be careful when replacing parts. Incorrect replacement could affect the performance of the steering system and result in hazardous driving.

Click hereSteering>POWER ASSIST SYSTEMS>POWER STEERING SYSTEM (w/ Variable Flow Control Solenoid Valve)>PRECAUTION



c.

Precaution for SRS airbag system handling

NOTICE:

This vehicle is equipped with a supplemental restraint system (SRS) which includes parts such as airbags for the driver and passenger. Failure to carry out service operations in the correct sequence could cause unexpected SRS deployment during servicing and may cause a serious accident. Before servicing (including removal/installation, inspection and replacement of parts), be sure to read precaution for SRS airbag system.

for Type A: Click hereVehicle Interior>SUPPLEMENTAL RESTRAINT SYSTEMS>AIRBAG SYSTEM (for Type A)>PRECAUTION

for Type B: Click hereVehicle Interior>SUPPLEMENTAL RESTRAINT SYSTEMS>AIRBAG SYSTEM (for Type B)>PRECAUTION

for Type C: Click hereVehicle Interior>SUPPLEMENTAL RESTRAINT SYSTEMS>AIRBAG SYSTEM (for Type C)>PRECAUTION



d.

Precaution for when disconnecting a wire harness from a CAN junction connector

i.

When disconnecting a wire harness from a CAN junction connector, use tape or tags to identify each connector and make sure to reconnect each connector to its original location on the CAN junction connector.

HINT:
·

There is a CAN junction that can be installed at the preferred installation position. When the connector is disconnected, connect it at its original location to prevent incorrect installation.

·

For identifying where to connect CAN junctions and CAN junction connectors, refer to "Terminals of ECU".

Click herePower Source / Network>NETWORKING>CAN COMMUNICATION SYSTEM>TERMINALS OF ECU





e.

Bus line repair

i.

When repairing a CAN line or other communication line, make sure the untwisted portion of the wires is as short as possible, and wrap the line with tape while twisting the Hi/Lo wires together so that there is no separation between them.

NOTICE:

Untwisting and separation between wires may degrade equipment performance.



ii.
C275045C03
1.813,0.813 2.229,0.396 false 2.271,0.281 2.583,0.438 0.313,0.156 10 *a
*a Bypass Wire


Do not use bypass wiring between connectors.

NOTICE:
·

The ability of the twisted bus lines to resist interference will be lost if bypass wiring is used.

·

Do not use a twisted pair of wires for bypass wiring.





f.

Connector handling

i.
C274177C05
1.198,1.74 1.396,1.375 false 1.198,1.74 1.844,1.25 false 1.063,1.729 1.375,1.927 0.313,0.198 10 *a
*a Tester Probe


When checking resistance with a tester, insert the tester probes from the backside (harness side) of the connector.


ii.
C275046C03
1.25,0.333 1.667,0.917 false 1.25,0.333 1.51,1.313 false 1.115,0.177 1.427,0.333 0.313,0.156 10 *a
*a Service Wire


When it is not possible to insert the tester from the backside of the connector, using service wires, measure from the front side of the connector.



g.

Precaution for when replacing a gateway function equipped ECU (sub bus monitoring ECU)

i.

When replacing a gateway equipped function ECU (sub bus monitoring ECU) with one which was installed to another vehicle, perform initialization of the sub bus monitoring ECU in order to clear stored bus information.

Click herePower Source / Network>NETWORKING>CAN COMMUNICATION SYSTEM>UTILITY

NOTICE:

If the stored bus information does not match the current sub bus configuration, DTCs may be stored and fail-safe functions may operate.


HINT:

It is not necessary to perform initialization of a gateway monitoring ECU (sub bus monitoring ECU) when using a sub bus monitoring ECU which was installed to another vehicle with the same sub bus configuration.




h.

Precautions for when a gateway function equipped ECU (sub bus monitor ECU) detects communication DTCs for ECUs not connected to the ECU

i.

Refer to precautions when replacing a gateway function equipped ECU (sub bus monitoring ECU) and initialize the connection information of the ECU.


ii.

Clear the DTCs and check that no DTCs are output.



i.

Difference between a pre-installed TOYOTA genuine navigation receiver and a CAN compatible optional navigation receiver

i.

Some navigation receivers are available as CAN compatible optional devices. Be aware that CAN compatible optional devices do not have the same diagnostic features or characteristics of pre-installed TOYOTA genuine navigation receivers.

NOTICE:
·

CAN compatible optional navigation receivers receive data from the CAN communication system. However, most CAN compatible optional navigation receivers do not send signals to the CAN bus main line.

·

Most CAN compatible optional navigation receivers will not be displayed on the "Communication Bus Check" screen of the GTS.

·

When checking for DTCs using the GTS, DTCs for CAN compatible optional navigation receivers will not be displayed on the GTS.






SENSOR EXPRESSIONS


a.

The descriptions for the blind spot monitor sensors differ depending on the system. The expressions listed in the table below are used in this Repair Manual.

Part Name Expression in Others
Blind spot monitor sensor LH Blind spot monitor sensor LH (B)
Blind spot monitor sensor RH Blind spot monitor sensor RH (A)