Toyota Avalon (XX50): Open in Bus 4 Main Bus Line. Open in Bus 5 Main Bus Line. Open in One Side of Bus 1 Branch Line

Toyota Avalon (XX50) 2019-2022 Service & Repair Manual / Power Source, Network / Networking / Can Communication System(for Hv Model) / Open in Bus 4 Main Bus Line. Open in Bus 5 Main Bus Line. Open in One Side of Bus 1 Branch Line

Open in Bus 4 Main Bus Line

DESCRIPTION

There may be an open circuit in one of the CAN main bus lines when the resistance between terminals 22 (CA2H) and 7 (CA2L) of the central gateway ECU (network gateway ECU) is 70 Ω or higher.

Symptom	Trouble Area
Resistance between terminals 22 (CA2H) and 7 (CA2L) of the central gateway ECU (network gateway ECU) is 70 Ω or higher.	CAN main bus lines or connector Central gateway ECU (network gateway ECU) Airbag ECU assembly No. 2 CAN junction connector No. 4 CAN junction connector No. 1 junction connector

This malfunction is not related to the lines of a CAN branch or to ECUs or sensors connected to a CAN branch.

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

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 MAIN BUS LINES (NO. 1 JUNCTION CONNECTOR)

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

(b) Disconnect the K67 No. 1 junction connector.

Front view of wire harness connector

(to No. 1 Junction Connector)

to Central Gateway ECU (Network Gateway ECU)

to No. 2 CAN Junction Connector

Standard Resistance:

Tester Connection	Condition	Specified Condition	Connected to
K67-10 (CANH) - K67-21 (CANL)	Cable disconnected from negative (-) auxiliary battery terminal	108 to 132 Ω	Central gateway ECU (network gateway ECU)
K67-11 (CANH) - K67-22 (CANL)	Cable disconnected from negative (-) auxiliary battery terminal	108 to 132 Ω	No. 2 CAN junction connector

Result	Proceed to
OK	A
NG (Line to central gateway ECU (network gateway ECU))	B
NG (Line to No. 2 CAN junction connector)	C

REPLACE NO. 1 JUNCTION CONNECTOR

GO TO STEP 3

2.	CHECK FOR OPEN IN CAN MAIN BUS LINES (CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU) - NO. 1 JUNCTION CONNECTOR)

(a) Reconnect the K67 No. 1 junction connector.

(b) Disconnect the G52 central gateway ECU (network gateway ECU) connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
G52-22 (CA2H) - G52-7 (CA2L)	Cable disconnected from negative (-) auxiliary battery terminal	108 to 132 Ω

*a	Front view of wire harness connector (to Central Gateway ECU (Network Gateway ECU))

REPLACE CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU)

REPAIR OR REPLACE CAN MAIN BUS LINES OR CONNECTOR (CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU) - NO. 1 JUNCTION CONNECTOR)

3.	CHECK FOR OPEN IN CAN MAIN BUS LINES (NO. 2 CAN JUNCTION CONNECTOR)

(a) Reconnect the K67 No. 1 junction connector.

(b) Disconnect the A49 No. 2 CAN junction connector.

Front view of wire harness connector

(to No. 2 CAN Junction Connector)

to No. 1 Junction Connector

to No. 4 CAN Junction Connector

Standard Resistance:

Tester Connection	Condition	Specified Condition	Connected to
A49-2 (CANH) - A49-13 (CANL)	Cable disconnected from negative (-) auxiliary battery terminal	108 to 132 Ω	No. 1 junction connector
A49-5 (CANH) - A49-16 (CANL)	Cable disconnected from negative (-) auxiliary battery terminal	108 to 132 Ω	No. 4 CAN junction connector

Result	Proceed to
OK	A
NG (Line to No. 1 junction connector)	B
NG (Line to No. 4 CAN junction connector)	C

REPLACE NO. 2 CAN JUNCTION CONNECTOR

REPAIR OR REPLACE CAN MAIN BUS LINES OR CONNECTOR (NO. 2 CAN JUNCTION CONNECTOR - NO. 1 JUNCTION CONNECTOR)

4.	CHECK FOR OPEN IN CAN MAIN BUS LINES (NO. 4 CAN JUNCTION CONNECTOR - NO. 2 CAN JUNCTION CONNECTOR)

(a) Reconnect the A49 No. 2 CAN junction connector.

(b) Disconnect the G95 No. 4 CAN junction connector.

Front view of wire harness connector

(to No. 4 CAN Junction Connector)

to No. 2 CAN Junction Connector

Standard Resistance:

Tester Connection	Condition	Specified Condition
G95-6 (CANH) - G95-17 (CANL)	Cable disconnected from negative (-) auxiliary battery terminal	108 to 132 Ω

REPAIR OR REPLACE CAN MAIN BUS LINES OR CONNECTOR (NO. 4 CAN JUNCTION CONNECTOR - NO. 2 CAN JUNCTION CONNECTOR)

5.	CHECK FOR OPEN IN CAN MAIN BUS LINES (NO. 4 CAN JUNCTION CONNECTOR)

(a) Reconnect the G95 No. 4 CAN junction connector.

(b) Disconnect the G96 No. 4 CAN junction connector.

Front view of wire harness connector

(to No. 4 CAN Junction Connector)

to Airbag ECU Assembly

Standard Resistance:

Tester Connection	Condition	Specified Condition
G96-6 (CANH) - G96-17 (CANL)	Cable disconnected from negative (-) auxiliary battery terminal	108 to 132 Ω

REPLACE NO. 4 CAN JUNCTION CONNECTOR

6.	CHECK FOR OPEN IN CAN MAIN BUS LINES (AIRBAG ECU ASSEMBLY - NO. 4 CAN JUNCTION CONNECTOR)

(a) Reconnect the G96 No. 4 CAN junction connector.

(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 (-) auxiliary battery terminal	108 to 132 Ω

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

REPLACE AIRBAG ECU ASSEMBLY

REPAIR OR REPLACE CAN MAIN BUS LINES OR CONNECTOR (AIRBAG ECU ASSEMBLY - NO. 4 CAN JUNCTION CONNECTOR)

Open in Bus 5 Main Bus Line

DESCRIPTION

There may be an open circuit in one of the CAN main bus lines when the resistance between terminals 15 (CA5H) and 16 (CA5L) of the central gateway ECU (network gateway ECU) is 70 Ω or higher.

Symptom	Trouble Area
Resistance between terminals 15 (CA5H) and 16 (CA5L) of the central gateway ECU (network gateway ECU) is 70 Ω or higher.	CAN main bus lines or connector Central gateway ECU (network gateway ECU) Combination meter assembly No. 3 CAN junction connector No. 6 CAN junction connector No. 2 junction connector No. 3 junction connector

This malfunction is not related to the lines of a CAN branch or to ECUs or sensors connected to a CAN branch.

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

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 MAIN BUS LINES (NO. 6 CAN JUNCTION CONNECTOR)

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

(b) Disconnect the K65 No. 6 CAN junction connector.

Front view of wire harness connector

(to No. 6 CAN Junction Connector)

to Central Gateway ECU (Network Gateway ECU)

to No. 2 Junction Connector

Standard Resistance:

Tester Connection	Condition	Specified Condition	Connected to
K65-1 (CANH) - K65-12 (CANL)	Cable disconnected from negative (-) auxiliary battery terminal	108 to 132 Ω	Central gateway ECU (network gateway ECU)
K65-2 (CANH) - K65-13 (CANL)	Cable disconnected from negative (-) auxiliary battery terminal	108 to 132 Ω	No. 2 junction connector

Result	Proceed to
OK	A
NG (Line to central gateway ECU (network gateway ECU))	B
NG (Line to No. 2 junction connector)	C

REPLACE NO. 6 CAN JUNCTION CONNECTOR

GO TO STEP 3

2.	CHECK FOR OPEN IN CAN MAIN BUS LINES (CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU) - NO. 6 CAN JUNCTION CONNECTOR)

(a) Reconnect the K65 No. 6 CAN junction connector.

(b) Disconnect the G52 central gateway ECU (network gateway ECU) connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
G52-15 (CA5H) - G52-16 (CA5L)	Cable disconnected from negative (-) auxiliary battery terminal	108 to 132 Ω

*a	Front view of wire harness connector (to Central Gateway ECU (Network Gateway ECU))

REPLACE CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU)

REPAIR OR REPLACE CAN MAIN BUS LINES OR CONNECTOR (CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU) - NO. 6 CAN JUNCTION CONNECTOR)

3.	CHECK FOR OPEN IN CAN MAIN BUS LINES (NO. 2 JUNCTION CONNECTOR)

(a) Reconnect the K65 No. 6 CAN junction connector.

(b) Disconnect the K69 No. 2 junction connector.

Front view of wire harness connector

(to No. 2 Junction Connector)

to No. 6 CAN Junction Connector

to No. 3 Junction Connector

Standard Resistance:

Tester Connection	Condition	Specified Condition	Connected to
K69-1 (CANH) - K69-12 (CANL)	Cable disconnected from negative (-) auxiliary battery terminal	108 to 132 Ω	No. 6 CAN junction connector
K69-2 (CANH) - K69-13 (CANL)	Cable disconnected from negative (-) auxiliary battery terminal	108 to 132 Ω	No. 3 junction connector

Result	Proceed to
OK	A
NG (Line to No. 6 CAN junction connector)	B
NG (Line to No. 3 junction connector)	C

REPLACE NO. 2 JUNCTION CONNECTOR

REPAIR OR REPLACE CAN MAIN BUS LINES OR CONNECTOR (NO. 2 JUNCTION CONNECTOR - NO. 6 CAN JUNCTION CONNECTOR)

4.	CHECK FOR OPEN IN CAN MAIN BUS LINES (NO. 3 JUNCTION CONNECTOR)

(a) Reconnect the K69 No. 2 junction connector.

(b) Disconnect the K64 No. 3 junction connector.

Front view of wire harness connector

(to No. 3 Junction Connector)

to No. 3 CAN Junction Connector

to No. 2 Junction Connector

Standard Resistance:

Tester Connection	Condition	Specified Condition	Connected to
K64-3 (CANH) - K64-14 (CANL)	Cable disconnected from negative (-) auxiliary battery terminal	108 to 132 Ω	No. 3 CAN junction connector
K64-4 (CANH) - K64-15 (CANL)	Cable disconnected from negative (-) auxiliary battery terminal	108 to 132 Ω	No. 2 junction connector

Result	Proceed to
OK	A
NG (Line to No. 3 CAN junction connector)	B
NG (Line to No. 2 junction connector)	C

REPLACE NO. 3 JUNCTION CONNECTOR

REPAIR OR REPLACE CAN MAIN BUS LINES OR CONNECTOR (NO. 3 JUNCTION CONNECTOR - NO. 2 JUNCTION CONNECTOR)

5.	CHECK FOR OPEN IN CAN MAIN BUS LINES (NO. 3 CAN JUNCTION CONNECTOR)

(a) Reconnect the K64 No. 3 junction connector.

(b) Disconnect the G94 No. 3 CAN junction connector.

Front view of wire harness connector

(to No. 3 CAN Junction Connector)

to No. 3 Junction Connector

to Combination Meter Assembly

Standard Resistance:

Tester Connection	Condition	Specified Condition	Connected to
G94-3 (CANH) - G94-14 (CANL)	Cable disconnected from negative (-) auxiliary battery terminal	108 to 132 Ω	No. 3 junction connector
G94-5 (CANH) - G94-16 (CANL)	Cable disconnected from negative (-) auxiliary battery terminal	108 to 132 Ω	Combination meter assembly

Result	Proceed to
OK	A
NG (Line to No. 3 junction connector)	B
NG (Line to Combination meter assembly)	C

REPLACE NO. 3 CAN JUNCTION CONNECTOR

REPAIR OR REPLACE CAN MAIN BUS LINES OR CONNECTOR (NO. 3 CAN JUNCTION CONNECTOR - NO. 3 JUNCTION CONNECTOR)

6.	CHECK FOR OPEN IN CAN MAIN BUS LINES (COMBINATION METER ASSEMBLY - NO. 3 CAN JUNCTION CONNECTOR)

(a) Reconnect the G94 No. 3 CAN junction connector.

(b) Disconnect the G16 combination meter assembly connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
G16-32 (CANH) - G16-31 (CANL)	Cable disconnected from negative (-) auxiliary battery terminal	108 to 132 Ω

*a	Front view of wire harness connector (to Combination Meter Assembly)

REPLACE COMBINATION METER ASSEMBLY

REPAIR OR REPLACE CAN MAIN BUS LINES OR CONNECTOR (COMBINATION METER ASSEMBLY - NO. 3 CAN JUNCTION CONNECTOR)

Open in One Side of Bus 1 Branch Line

DESCRIPTION

When the CAN bus main lines are normal (no open, short to ground, short to +B or short between lines) and there is an ECU or sensor on the "Communication Bus Check" screen that is indicated as not communicating or whose connection status on the "Communication Bus Check" screen changes intermittently, an open in one of the wires of a CAN bus branch line is suspected.

HINT:

If there is an ECU or sensor whose connection status changes intermittently while checking the "Communication Bus Check" screen, there may be an open circuit in one of the wires of a branch line of an ECU or sensor in the bus. If an open occurs in one of the wires of a CAN branch line, it may interfere with the communication of other ECUs or sensors resulting in an incorrect state being displayed.

Symptom

Trouble Area

There is an ECU or sensor that is indicated as not communicating on the "Communication Bus Check" screen or whose connection status on the "Communication Bus Check" screen changes intermittently.

One side of CAN branch line is open, or output signals are incomplete.

Forward recognition camera
Millimeter wave radar sensor assembly
Swing grille actuator assembly
Blind spot monitor sensor RH
Television camera assembly
Clearance warning ECU assembly
(w/ Intelligent Clearance Sonar System)
Parking assist ECU
(w/ Panoramic View Monitor System)
Driving support ECU assembly

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
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

PROCEDURE

1.	CHECK FOR OPEN IN ONE SIDE OF CAN BRANCH LINE

(a) Based on the vehicle equipment and specifications, confirm the systems that use CAN communication.

Click here

(b) Connect the Techstream to the DLC3.

(d) Turn the Techstream on.

(e) Using the Techstream, perform "CAN Bus Check".

CAN Bus Check

(f) Observe the screen for approximately 2 minutes to check for ECUs and sensors that are displayed as not communicating.

(g) Perform the inspection as specified in the Problem Symptoms Table for the ECUs or sensors that are not communicating.

GO TO CORRESPONDING COMMUNICATION STOP MODE

Open in Bus 1 Main Bus Line. Open in Bus 2 Main Bus Line. Open in Bus 3 Main Bus Line

Open in One Side of Bus 2 Branch Line. Open in One Side of Bus 3 Branch Line. Open in One Side of Bus 4 Branch Line

See More:

Toyota Avalon (XX50) 2019-2022 Service & Repair Manual > Can Communication System(for Hv Model): Check Bus 2 Lines for Short Circuit
DESCRIPTION There may be a short circuit between the CAN main bus lines and/or CAN branch lines when the resistance between terminals 18 (CA4H) and 17 (CA4L) of the central gateway ECU (network gateway ECU) is below 54 Ω. Symptom Trouble Area Resistance between terminals 18 (CA4H) and 17 (CA4L) of ...