Toyota Yaris: Can Communication System / Bus Buffer ECU Communication Stop Mode

Toyota Yaris XP210 (2020-2024) Reapir and Service Manual / Power Source & Network / Networking / Can Communication System / Bus Buffer ECU Communication Stop Mode

DESCRIPTION

Detection Item	Symptom	Trouble Area
Bus Buffer ECU Communication Stop Mode	Communication stop for "Remote Engine Starter" is indicated on the "Communication Bus Check" screen of the GTS. Click here	Option connector (bus buffer ECU) main line or connector CAN compatible optional device Main body ECU (multiplex network body ECU)

Detection Item

Symptom

Trouble Area

Bus Buffer ECU Communication Stop Mode

Communication stop for "Remote Engine Starter" is indicated on the "Communication Bus Check" screen of the GTS.

Click here

Option connector (bus buffer ECU) main line or connector
CAN compatible optional device
Main body ECU (multiplex network body ECU)

WIRING DIAGRAM

CAUTION / NOTICE / HINT

CAUTION:

When performing the confirmation driving pattern, obey all speed limits and traffic laws.

NOTICE:

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.
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Before measuring the resistance of the CAN bus, turn the ignition switch off and leave the vehicle for 1 minute or more without operating the key or any switches, or opening or closing the doors. After that, disconnect the cable from the negative (-) auxiliary battery terminal and leave the vehicle for 1 minute or more before measuring the resistance.
After the ignition switch is turned off, there may be a waiting time before disconnecting the negative (-) auxiliary battery terminal.
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When disconnecting and reconnecting the auxiliary battery, there is an automatic learning function that completes learning when the respective system is used.
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Some parts must be initialized and set when replacing or removing and installing parts.
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After performing repairs, perform the DTC check procedure and confirm that the DTCs are not output again.
DTC check procedure: Turn the ignition switch to ON and wait for 1 minute or more. Then operate the suspected malfunctioning system and drive the vehicle at 60 km/h (37 mph) or more for 5 minutes or more.
After the repair, perform the CAN bus check and check that all the ECUs and sensors connected to the CAN communication system are displayed as normal.
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HINT:

Before disconnecting related connectors for inspection, push in on each connector body to check that the connector is not loose or disconnected.
When a connector is disconnected, check that the terminals and connector body are not cracked, deformed or corroded.

PROCEDURE

1.	CHECK VEHICLE TYPE

(a) Check whether dealer installed options that support CAN communication are installed.

Result	Proceed to
Installed	A
Not installed	B

GO TO STEP 3

2.	CHECK FOR OPEN IN CAN BUS LINES (OPTION CONNECTOR (BUS BUFFER ECU) MAIN LINE)

(a) Disconnect the cable from the negative (-) auxiliary battery terminal.

*a	Front view of wire harness connector (to Option Connector)

(b) Disconnect the option connector (bus buffer ECU).

Standard Resistance:

Tester Connection	Condition	Specified Condition
H62-2 (CAN+) - H62-1 (CAN-)	Cable disconnected from negative (-) auxiliary battery terminal	108 to 132 Ω

REPAIR OR REPLACE CAN COMPATIBLE OPTIONAL DEVICE

REPAIR OR REPLACE CAN MAIN BUS LINES OR CONNECTOR (OPTION CONNECTOR (BUS BUFFER ECU))

3.	CHECK FOR DTC

(a) Initialize the ECU.

Body Electrical > Central Gateway > Utility

Tester Display
Initialization

Body Electrical > Main Body > Utility

Tester Display
Initialization

(b) Clear the DTCs.

Body Electrical > Main Body > Clear DTCs

Body Electrical > Main Body > Trouble Codes

Result	Proceed to
DTC U111787 is not output from main body ECU (multiplex network body ECU)	A
DTC U111787 is output from main body ECU (multiplex network body ECU)	B

END

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

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