Toyota Avalon (XX50): Open in One Side of Bus 5 Branch Line. Parking Assist ECU Communication Stop Mode. Parts Location

Toyota Avalon (XX50) 2019-2022 Service & Repair Manual / Power Source, Network / Networking / Can Communication System(for Hv Model) / Open in One Side of Bus 5 Branch Line. Parking Assist ECU Communication Stop Mode. Parts Location

Open in One Side of Bus 5 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. Outer mirror control ECU assembly LH (w/ Seat Position Memory System) Outer mirror control ECU assembly RH (w/ Seat Position Memory System) Headlight ECU sub-assembly RH (w/ Cornering Light) Headlight ECU sub-assembly LH (w/ Cornering Light) Position control ECU assembly LH (w/ Seat Position Memory System) Certification ECU (smart key ECU assembly) Multiplex tilt and telescopic ECU (w/ Power Tilt and Power Telescopic System) Meter mirror sub-assembly (w/ Headup Display System) Main body ECU (multiplex network body ECU) Air conditioning amplifier assembly

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.

Outer mirror control ECU assembly LH
(w/ Seat Position Memory System)
Outer mirror control ECU assembly RH
(w/ Seat Position Memory System)
Headlight ECU sub-assembly RH
(w/ Cornering Light)
Headlight ECU sub-assembly LH
(w/ Cornering Light)
Position control ECU assembly LH
(w/ Seat Position Memory System)
Certification ECU (smart key ECU assembly)
Multiplex tilt and telescopic ECU
(w/ Power Tilt and Power Telescopic System)
Meter mirror sub-assembly
(w/ Headup Display System)
Main body ECU (multiplex network body ECU)
Air conditioning amplifier 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
Before replacing the main body ECU (multiplex network body ECU) or certification ECU (smart key ECU assembly), refer to Registration.
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

Parking Assist ECU Communication Stop Mode

DESCRIPTION

Detection Item	Symptom	Trouble Area
Parking Assist ECU Communication Stop Mode	Any of the following conditions are met: Communication stop for "Panoramic View Monitor / Circumference Monitoring Camera Control Module" is indicated on the "Communication Bus Check" screen of the Techstream. Click here Communication stop history for "Panoramic View Monitor / Circumference Monitoring Camera Control Module" is indicated on the "Communication Bus Check (Detail)" screen of the Techstream. (The Lost Communication Time value for "Panoramic View Monitor / Circumference Monitoring Camera Control Module" is 6 or more.) Click here Communication system DTCs (DTCs that start with U) that correspond to "Parking Assist ECU Communication Stop Mode" in "DTC Combination Table" are output. Click here	Parking assist ECU branch line or connector Power source circuit of parking assist ECU Parking assist ECU ground circuit Parking assist ECU

Detection Item

Symptom

Trouble Area

Parking Assist ECU Communication Stop Mode

Any of the following conditions are met:

Communication stop for "Panoramic View Monitor / Circumference Monitoring Camera Control Module" is indicated on the "Communication Bus Check" screen of the Techstream.
Click here
Communication stop history for "Panoramic View Monitor / Circumference Monitoring Camera Control Module" is indicated on the "Communication Bus Check (Detail)" screen of the Techstream. (The Lost Communication Time value for "Panoramic View Monitor / Circumference Monitoring Camera Control Module" is 6 or more.)
Click here
Communication system DTCs (DTCs that start with U) that correspond to "Parking Assist ECU Communication Stop Mode" in "DTC Combination Table" are output.
Click here

Parking assist ECU branch line or connector
Power source circuit of parking assist ECU
Parking assist ECU ground circuit
Parking assist 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.
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 (PARKING ASSIST ECU BRANCH LINE)

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

(b) Disconnect the K35 parking assist ECU connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
K35-12 (CANH) - K35-13 (CANL)	Cable disconnected from negative (-) auxiliary battery terminal	54 to 69 Ω

*a	Front view of wire harness connector (to Parking Assist ECU)

REPAIR OR REPLACE CAN BRANCH LINES OR CONNECTOR (PARKING ASSIST ECU)

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
K35-3 (GND1) - Body ground	Cable disconnected from negative (-) auxiliary battery terminal	Below 1 Ω

*a	Front view of wire harness connector (to Parking Assist ECU)

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

Standard Voltage:

Tester Connection	Condition	Specified Condition
K35-2 (+B) - Body ground	Power switch off	11 to 14 V
K35-6 (IG) - Body ground	Power switch on (IG)	11 to 14 V
K35-1 (ACC) - Body ground	Power switch on (ACC)	11 to 14 V

REPLACE PARKING ASSIST ECU

REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT)

Parts Location

PARTS LOCATION

ILLUSTRATION

*1	HEADLIGHT ECU SUB-ASSEMBLY RH (w/ Cornering Light)	*2	BRAKE ACTUATOR ASSEMBLY
*3	INVERTER WITH CONVERTER ASSEMBLY	*4	ECM
*5	FORWARD RECOGNITION CAMERA	*6	BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY
*7	RACK AND PINION POWER STEERING GEAR ASSEMBLY	*8	HEADLIGHT ECU SUB-ASSEMBLY LH (w/ Cornering Light)
*9	MILLIMETER WAVE RADAR SENSOR ASSEMBLY	*10	SWING GRILLE ACTUATOR ASSEMBLY
*11	TIRE PRESSURE WARNING ECU AND RECEIVER	*12	BLIND SPOT MONITOR SENSOR RH
*13	TELEVISION CAMERA ASSEMBLY	*14	OUTER MIRROR CONTROL ECU ASSEMBLY RH (w/ Seat Position Memory System)
*15	OUTER MIRROR CONTROL ECU ASSEMBLY LH (w/ Seat Position Memory System)	*16	NO. 1 JUNCTION CONNECTOR
*17	NO. 2 JUNCTION CONNECTOR	-	-

ILLUSTRATION

*1	INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY	*2	MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)
*3	METER MIRROR SUB-ASSEMBLY (w/ Headup Display System)	*4	AIR CONDITIONING AMPLIFIER ASSEMBLY
*5	DCM (TELEMATICS TRANSCEIVER)	*6	CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)
*7	CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU)	*8	CLEARANCE WARNING ECU ASSEMBLY (w/ Intelligent Clearance Sonar System)
*9	PARKING ASSIST ECU (w/ Panoramic View Monitor System)	*10	OCCUPANT DETECTION ECU
*11	AIRBAG ECU ASSEMBLY	*12	STEERING SENSOR
*13	HYBRID VEHICLE CONTROL ECU	-	-

ILLUSTRATION

*1	NO. 3 JUNCTION CONNECTOR	*2	NO. 2 CAN JUNCTION CONNECTOR
*3	COMBINATION METER ASSEMBLY	*4	NO. 3 CAN JUNCTION CONNECTOR
*5	RADIO AND DISPLAY RECEIVER ASSEMBLY	*6	POSITION CONTROL ECU ASSEMBLY LH (w/ Seat Position Memory System)
*7	NO. 1 CAN JUNCTION CONNECTOR	*8	NO. 6 CAN JUNCTION CONNECTOR
*9	NO. 7 CAN JUNCTION CONNECTOR	*10	NO. 4 CAN JUNCTION CONNECTOR
*11	DLC3	*12	MULTIPLEX TILT AND TELESCOPIC ECU (w/ Power Tilt and Power Telescopic System)
*13	DRIVING SUPPORT ECU ASSEMBLY	-	-

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

Power Steering ECU Communication Stop Mode. Precaution. Problem Symptoms Table

See More:

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