Toyota Avalon (XX50): Blind Spot Monitor Sensor Communication Stop Mode. Center Airbag Sensor Communication Stop Mode. Certification ECU Communication Stop Mode

Toyota Avalon (XX50) 2019-2022 Service & Repair Manual / Power Source, Network / Networking / Can Communication System(for Gasoline Model) / Blind Spot Monitor Sensor Communication Stop Mode. Center Airbag Sensor Communication Stop Mode. Certification ECU Communication Stop Mode

Blind Spot Monitor Sensor Communication Stop Mode

DESCRIPTION

Detection Item	Symptom	Trouble Area
Blind Spot Monitor Sensor Communication Stop Mode	Any of the following conditions are met: Communication stop for "Blind Spot Monitor Master" is indicated on the "Communication Bus Check" screen of the Techstream. Click here Communication stop history for "Blind Spot Monitor Master" is indicated on the "Communication Bus Check (Detail)" screen of the Techstream. (The Lost Communication Time value for "Blind Spot Monitor Master" is 6 or more.) Click here Communication system DTCs (DTCs that start with U) that correspond to "Blind Spot Monitor Sensor Communication Stop Mode" in "DTC Combination Table" are output. Click here	Blind spot monitor sensor RH branch line or connector Power source circuit of blind spot monitor sensor RH Blind spot monitor sensor RH ground circuit Blind spot monitor sensor RH

Detection Item

Symptom

Trouble Area

Blind Spot Monitor Sensor Communication Stop Mode

Any of the following conditions are met:

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

Blind spot monitor sensor RH branch line or connector
Power source circuit of blind spot monitor sensor RH
Blind spot monitor sensor RH ground circuit
Blind spot monitor sensor RH

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 engine 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 (-) battery terminal and leave the vehicle for 1 minute or more before measuring the resistance.
After turning the engine switch off, waiting time may be required before disconnecting the cable from the negative (-) battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) 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 engine 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 (BLIND SPOT MONITOR SENSOR RH BRANCH LINE)

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

(b) Disconnect the P5 blind spot monitor sensor RH connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
P5-2 (CA1P) - P5-7 (CA1N)	Cable disconnected from negative (-) battery terminal	54 to 69 Ω

*a	Front view of wire harness connector (to Blind Spot Monitor Sensor RH)

REPAIR OR REPLACE CAN BRANCH LINES OR CONNECTOR (BLIND SPOT MONITOR SENSOR RH)

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
P5-10 (BRGD) - Body ground	Cable disconnected from negative (-) battery terminal	Below 1 Ω

*a	Front view of wire harness connector (to Blind Spot Monitor Sensor RH)

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

Standard Voltage:

Tester Connection	Condition	Specified Condition
P5-5 (BRB) - Body ground	Engine switch on (IG)	11 to 14 V

REPLACE BLIND SPOT MONITOR SENSOR RH

REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT)

Center Airbag Sensor Communication Stop Mode

DESCRIPTION

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

Detection Item

Symptom

Trouble Area

Center Airbag Sensor Communication Stop Mode

Any of the following conditions are met:

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

Airbag ECU assembly main line or connector
Power source circuit of airbag ECU assembly
Airbag ECU assembly ground circuit
Airbag ECU 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 engine 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 (-) battery terminal and leave the vehicle for 1 minute or more before measuring the resistance.
After turning the engine switch off, waiting time may be required before disconnecting the cable from the negative (-) battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) 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 engine 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 (AIRBAG ECU ASSEMBLY MAIN LINE)

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

(b) Disconnect the G50 airbag ECU assembly connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
G50-26 (CANH) - G50-27 (CANL)	Cable disconnected from negative (-) battery terminal	108 to 132 Ω

*a	Front view of wire harness connector (to Airbag ECU Assembly)

REPAIR OR REPLACE CAN MAIN BUS LINES OR CONNECTOR (AIRBAG ECU 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
G50-32 (E2) - Body ground	Cable disconnected from negative (-) battery terminal	Below 1 Ω
G50-33 (E1) - Body ground	Cable disconnected from negative (-) battery terminal	Below 1 Ω

*a	Front view of wire harness connector (to Airbag ECU Assembly)

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

Standard Voltage:

Tester Connection	Condition	Specified Condition
G50-36 (IG2) - Body ground	Engine switch on (IG)	11 to 14 V

REPLACE AIRBAG ECU ASSEMBLY

REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT)

Certification ECU Communication Stop Mode

DESCRIPTION

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

Detection Item

Symptom

Trouble Area

Certification ECU Communication Stop Mode

Any of the following conditions are met:

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

Certification ECU (smart key ECU assembly) branch line or connector
Power source circuit of certification ECU (smart key ECU assembly)
Certification ECU (smart key ECU assembly) ground circuit
Certification ECU (smart key ECU 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 engine 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 (-) battery terminal and leave the vehicle for 1 minute or more before measuring the resistance.
After turning the engine switch off, waiting time may be required before disconnecting the cable from the negative (-) battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) 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 engine 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 certification ECU (smart key ECU assembly), 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 (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) BRANCH LINE)

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

(b) Disconnect the G40 certification ECU (smart key ECU assembly) connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
G40-1 (CANH) - G40-2 (CANL)	Cable disconnected from negative (-) battery terminal	54 to 69 Ω

*a	Front view of wire harness connector (to Certification ECU (Smart Key ECU Assembly))

REPAIR OR REPLACE CAN BRANCH LINES OR CONNECTOR (CERTIFICATION ECU (SMART KEY ECU 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
G40-18 (E) - Body ground	Cable disconnected from negative (-) battery terminal	Below 1 Ω

*a	Front view of wire harness connector (to Certification ECU (Smart Key ECU Assembly))

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

Standard Voltage:

Tester Connection	Condition	Specified Condition
G40-4 (+B) - Body ground	Always	11 to 14 V

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT)

Active Noise Control ECU Communication Stop Mode. Air Conditioning Amplifier Communication Stop Mode. ECU Malfunction (B1003)

Check Bus 1 Line for Short to +B

See More:

Toyota Avalon (XX50) 2019-2022 Service & Repair Manual > Can Communication System(for Gasoline Model): Check Bus 2 Line for Short to +B. Check Bus 2 Line for Short to GND. Check Bus 2 Lines for Short Circuit
Check Bus 2 Line for Short to +B DESCRIPTION There may be a short circuit between one of the CAN bus lines and +B when there is no resistance between terminal 18 (CA4H) of the central gateway ECU (network gateway ECU) and terminal 16 (BAT) of the DLC3, or terminal 17 (CA4L) of the central gateway EC ...