Toyota Avalon (XX50): Main Body ECU Communication Stop Mode. Millimeter Wave Radar Sensor Communication Stop Mode. Motor Generator Control ECU Communication Stop Mode

Toyota Avalon (XX50) 2019-2022 Service & Repair Manual / Power Source, Network / Networking / Can Communication System(for Hv Model) / Main Body ECU Communication Stop Mode. Millimeter Wave Radar Sensor Communication Stop Mode. Motor Generator Control ECU Communication Stop Mode

Main Body ECU Communication Stop Mode

DESCRIPTION

Detection Item	Symptom	Trouble Area
Main Body ECU Communication Stop Mode	Any of the following conditions are met: Communication stop for "Main Body" is indicated on the "Communication Bus Check" screen of the Techstream. Click here Communication stop history for "Main Body" is indicated on the "Communication Bus Check (Detail)" screen of the Techstream. (The Lost Communication Time value for "Main Body" is 6 or more.) Click here Communication system DTCs (DTCs that start with U) that correspond to "Main Body ECU Communication Stop Mode" in "DTC Combination Table" are output. Click here	Main body ECU (multiplex network body ECU) branch line or connector Power source circuit of main body ECU (multiplex network body ECU) or instrument panel junction block assembly Main body ECU (multiplex network body ECU) or instrument panel junction block assembly ground circuit Main body ECU (multiplex network body ECU) or instrument panel junction block assembly

Detection Item

Symptom

Trouble Area

Main Body ECU Communication Stop Mode

Any of the following conditions are met:

Communication stop for "Main Body" is indicated on the "Communication Bus Check" screen of the Techstream.
Click here
Communication stop history for "Main Body" is indicated on the "Communication Bus Check (Detail)" screen of the Techstream. (The Lost Communication Time value for "Main Body" is 6 or more.)
Click here
Communication system DTCs (DTCs that start with U) that correspond to "Main Body ECU Communication Stop Mode" in "DTC Combination Table" are output.
Click here

Main body ECU (multiplex network body ECU) branch line or connector
Power source circuit of main body ECU (multiplex network body ECU) or instrument panel junction block assembly
Main body ECU (multiplex network body ECU) or instrument panel junction block assembly ground circuit
Main body ECU (multiplex network body ECU) or instrument panel junction block assembly

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.
Click here
Before measuring the resistance of the CAN bus, turn the power 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 turning the power switch off, waiting time may be required before disconnecting the cable from the negative (-) auxiliary battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) auxiliary battery terminal notices before proceeding with work.
Click here
After performing repairs, perform the DTC check procedure and confirm that the DTCs are not output again.
DTC check procedure: Turn the power switch on (IG) 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.
Click here
Inspect the fuses for circuits related to this system before performing the following procedure.
Before replacing the main body ECU (multiplex network body ECU), refer to Registration.
Click here

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 FOR OPEN IN CAN BUS LINES (MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) BRANCH LINE)

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

(b) Disconnect the G33 main body ECU (multiplex network body ECU) connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
G33-5 (CANH) - G33-4 (CANL)	Cable disconnected from negative (-) auxiliary battery terminal	54 to 69 Ω

*a	Front view of wire harness connector (to Main Body ECU (Multiplex Network Body ECU))

REPAIR OR REPLACE CAN BRANCH LINES OR CONNECTOR (MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU))

2.	CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT)

(a) Remove the main body ECU (multiplex network body ECU).

Click here

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection	Condition	Specified Condition
MB-11 (GND1) - Body ground	Cable disconnected from negative (-) auxiliary battery terminal	Below 1 Ω

NOTICE:

Perform this inspection with the wire harness connected to the instrument panel junction block assembly.

*a	Front view of wire harness connector (to Main Body ECU (Multiplex Network Body ECU))

(d) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection	Condition	Specified Condition
MB-30 (ACC) - Body ground	Power switch on (ACC)	11 to 14 V
MB-31 (BECU) - Body ground	Power switch off	11 to 14 V
MB-32 (IG) - Body ground	Power switch on (IG)	11 to 14 V

NOTICE:

Perform this inspection with the wire harness connected to the instrument panel junction block assembly.

Result	Proceed to
OK	A
NG (BECU)	B
NG (ACC)	C
NG (IG)	D
NG (GND1)	E

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

GO TO LIGHTING (INT) SYSTEM (ACC SIGNAL CIRCUIT)

GO TO LIGHTING (INT) SYSTEM (IG SIGNAL CIRCUIT)

GO TO STEP 4

3.	CHECK HARNESS AND CONNECTOR (BECU SIGNAL CIRCUIT)

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

(b) Disconnect the 4F instrument panel junction block assembly connector.

(d) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection	Condition	Specified Condition
4F-1 - Body ground	Power switch off	11 to 14 V

*a	Front view of wire harness connector (to Instrument Panel Junction Block Assembly)

REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

REPAIR OR REPLACE HARNESS OR CONNECTOR (BECU SIGNAL CIRCUIT)

4.	CHECK HARNESS AND CONNECTOR (GROUND CIRCUIT)

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

(b) Disconnect the 4D instrument panel junction block assembly connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
4D-3 - Body ground	Cable disconnected from negative (-) auxiliary battery terminal	Below 1 Ω

*a	Front view of wire harness connector (to Instrument Panel Junction Block Assembly)

REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

REPAIR OR REPLACE HARNESS OR CONNECTOR (GROUND CIRCUIT)

Millimeter Wave Radar Sensor Communication Stop Mode

DESCRIPTION

Detection Item	Symptom	Trouble Area
Millimeter Wave Radar Sensor Communication Stop Mode	Any of the following conditions are met: Communication stop for "Front Radar" is indicated on the "Communication Bus Check" screen of the Techstream. Click here Communication stop history for "Front Radar" is indicated on the "Communication Bus Check (Detail)" screen of the Techstream. (The Lost Communication Time value for "Front Radar" is 6 or more.) Click here Communication system DTCs (DTCs that start with U) that correspond to "Millimeter Wave Radar Sensor Communication Stop Mode" in "DTC Combination Table" are output. Click here	Millimeter wave radar sensor assembly branch line or connector Power source circuit of millimeter wave radar sensor assembly Millimeter wave radar sensor assembly ground circuit Millimeter wave radar sensor assembly

Detection Item

Symptom

Trouble Area

Millimeter Wave Radar Sensor Communication Stop Mode

Any of the following conditions are met:

Communication stop for "Front Radar" is indicated on the "Communication Bus Check" screen of the Techstream.
Click here
Communication stop history for "Front Radar" is indicated on the "Communication Bus Check (Detail)" screen of the Techstream. (The Lost Communication Time value for "Front Radar" is 6 or more.)
Click here
Communication system DTCs (DTCs that start with U) that correspond to "Millimeter Wave Radar Sensor Communication Stop Mode" in "DTC Combination Table" are output.
Click here

Millimeter wave radar sensor assembly branch line or connector
Power source circuit of millimeter wave radar sensor assembly
Millimeter wave radar sensor assembly ground circuit
Millimeter wave radar sensor assembly

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.
Click here
Before measuring the resistance of the CAN bus, turn the power 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 turning the power switch off, waiting time may be required before disconnecting the cable from the negative (-) auxiliary battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) auxiliary battery terminal notices before proceeding with work.
Click here
After performing repairs, perform the DTC check procedure and confirm that the DTCs are not output again.
DTC check procedure: Turn the power switch on (IG) 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.
Click here
Inspect the fuses for circuits related to this system before performing the following procedure.

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 FOR OPEN IN CAN BUS LINES (MILLIMETER WAVE RADAR SENSOR ASSEMBLY BRANCH LINE)

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

(b) Disconnect the A25 millimeter wave radar sensor assembly connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
A25-3 (CA2H) - A25-2 (CA2L)	Cable disconnected from negative (-) auxiliary battery terminal	54 to 69 Ω

*a	Front view of wire harness connector (to Millimeter Wave Radar Sensor Assembly)

REPAIR OR REPLACE CAN BRANCH LINES OR CONNECTOR (MILLIMETER WAVE RADAR SENSOR ASSEMBLY)

2.	CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT)

(a) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection	Condition	Specified Condition
A25-1 (SGND) - Body ground	Cable disconnected from negative (-) auxiliary battery terminal	Below 1 Ω

*a	Front view of wire harness connector (to Millimeter Wave Radar Sensor Assembly)

(b) Reconnect the cable to the negative (-) auxiliary battery terminal.

Standard Voltage:

Tester Connection	Condition	Specified Condition
A25-8 (IGB) - Body ground	Power switch on (IG)	11 to 14 V

REPLACE MILLIMETER WAVE RADAR SENSOR ASSEMBLY

REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT)

Motor Generator Control ECU Communication Stop Mode

DESCRIPTION

Detection Item

Symptom

Trouble Area

Motor Generator Control ECU Communication Stop Mode

Any of the following conditions are met:

Communication stop for "Motor Generator" is indicated on the "Communication Bus Check" screen of the Techstream.
Click here
Communication stop history for "Motor Generator" is indicated on the "Communication Bus Check (Detail)" screen of the Techstream. (The Lost Communication Time value for "Motor Generator" is 6 or more.)
Click here
Communication system DTCs (DTCs that start with U) that correspond to "Motor Generator Control ECU Communication Stop Mode" in "DTC Combination Table" are output.
Click here

Inverter with converter assembly branch line or connector
Power source circuit of inverter with converter assembly
Inverter with converter assembly ground circuit
Inverter with converter assembly

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.
Click here
Before measuring the resistance of the CAN bus, turn the power 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 turning the power switch off, waiting time may be required before disconnecting the cable from the negative (-) auxiliary battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) auxiliary battery terminal notices before proceeding with work.
Click here
After performing repairs, perform the DTC check procedure and confirm that the DTCs are not output again.
DTC check procedure: Turn the power switch on (IG) 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.
Click here
Inspect the fuses for circuits related to this system before performing the following procedure.

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 FOR OPEN IN CAN BUS LINES (INVERTER WITH CONVERTER ASSEMBLY BRANCH LINE)

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

(b) Disconnect the A42 inverter with converter assembly connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
A42-1 (CANH) - A42-7 (CANL)	Cable disconnected from negative (-) auxiliary battery terminal	54 to 69 Ω

*a	Front view of wire harness connector (to Inverter with Converter Assembly)

REPAIR OR REPLACE CAN BRANCH LINES OR CONNECTOR (INVERTER WITH CONVERTER ASSEMBLY)

2.	CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT)

(a) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection	Condition	Specified Condition
A42-23 (GND2) - Body ground	Cable disconnected from negative (-) auxiliary battery terminal	Below 1 Ω
A42-24 (GND1) - Body ground	Cable disconnected from negative (-) auxiliary battery terminal	Below 1 Ω

*a	Front view of wire harness connector (to Inverter with Converter Assembly)

(b) Reconnect the cable to the negative (-) auxiliary battery terminal.

Standard Voltage:

Tester Connection	Condition	Specified Condition
A42-5 (+B2) - Body ground	Power switch on (IG)	11 to 14 V
A42-6 (+B) - Body ground	Power switch on (IG)	11 to 14 V
A42-12 (IGCT) - Body ground	Power switch on (IG)	11 to 14 V

REPLACE INVERTER WITH CONVERTER ASSEMBLY

REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT)

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