Last Modified: 11-20-2023 6.11:8.1.0 Doc ID: RM100000001DF2L
Model Year Start: 2019 Model: Camry Prod Date Range: [08/2018 -           ]
Title: NETWORKING: CAN COMMUNICATION SYSTEM: Open in Bus 1 Main Bus Line; 2019 - 2024 MY Camry [08/2018 -        ]

Open in Bus 1 Main Bus Line

DESCRIPTION

There may be an open circuit in one of the CAN main bus lines when the resistance between terminals 23 (CA1H) and 8 (CA1L) of the central gateway ECU (network gateway ECU) is 70 Ω or higher.

Symptom

Trouble Area

Resistance between terminals 23 (CA1H) and 8 (CA1L) 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)
  • No. 1 CAN junction connector
  • No. 5 CAN junction connector

    (w/ Parking Assist Monitor System or Panoramic View Monitor System)

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

WIRING DIAGRAM

w/ Parking Assist Monitor System or Panoramic View Monitor System
w/ Rear View Monitor System

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 2018 - 2024 MY Camry [03/2017 -        ]; NETWORKING: CAN COMMUNICATION SYSTEM: HOW TO PROCEED WITH TROUBLESHOOTING

  • 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 (-) battery terminal and leave the vehicle for 1 minute or more before measuring the resistance.
  • After turning the ignition 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 2018 - 2019 MY Camry [06/2017 - 09/2019]; INTRODUCTION: REPAIR INSTRUCTION: PRECAUTION 2020 MY Camry [09/2019 - 03/2020]; INTRODUCTION: REPAIR INSTRUCTION: PRECAUTION 2020 - 2024 MY Camry [03/2020 -        ]; INTRODUCTION: REPAIR INSTRUCTION: PRECAUTION

  • 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.

    Click here 2019 MY Camry [08/2018 - 09/2019]; NETWORKING: CAN COMMUNICATION SYSTEM: DIAGNOSIS SYSTEM 2020 MY Camry [09/2019 - 03/2020]; NETWORKING: CAN COMMUNICATION SYSTEM: DIAGNOSIS SYSTEM 2020 MY Camry [03/2020 - 10/2020]; NETWORKING: CAN COMMUNICATION SYSTEM: DIAGNOSIS SYSTEM 2021 MY Camry [10/2020 - 08/2021]; NETWORKING: CAN COMMUNICATION SYSTEM: DIAGNOSIS SYSTEM 2022 - 2024 MY Camry [08/2021 -        ]; NETWORKING: CAN COMMUNICATION SYSTEM: DIAGNOSIS SYSTEM

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 vehicle type.

Result

Proceed to

w/ Parking Assist Monitor System or Panoramic View Monitor System

A

w/ Rear View Monitor System

B

B

GO TO STEP 6

A

2.

CHECK FOR OPEN IN CAN MAIN BUS LINES (NO. 1 CAN JUNCTION CONNECTOR)

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

(b) Disconnect the A66 No. 1 CAN junction connector.

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

*a

Front view of wire harness connector

(to No. 1 CAN Junction Connector)

*b

to Central Gateway ECU (Network Gateway ECU)

*c

to No. 5 CAN Junction Connector

-

-

Standard Resistance:

Tester Connection

Condition

Specified Condition

Connected to

A66-3 (CANH) - A66-9 (CANL)

Cable disconnected from negative (-) battery terminal

108 to 132 Ω

Central gateway ECU (network gateway ECU)

A66-5 (CANH) - A66-11 (CANL)

Cable disconnected from negative (-) battery terminal

108 to 132 Ω

No. 5 CAN junction connector

Result

Proceed to

OK

A

NG (Line to central gateway ECU (network gateway ECU))

B

NG (Line to No. 5 CAN junction connector)

C

A

REPLACE NO. 1 CAN JUNCTION CONNECTOR

C

GO TO STEP 4

B

3.

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

(a) Reconnect the A66 No. 1 CAN junction connector.

(b) Disconnect the K76 central gateway ECU (network gateway ECU) connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

K76-23 (CA1H) - K76-9 (CAXH)

Cable disconnected from negative (-) battery terminal

Below 1 Ω

K76-8 (CA1L) - K76-24 (CAXL)

Cable disconnected from negative (-) battery terminal

Below 1 Ω

*a

Front view of wire harness connector

(to Central Gateway ECU (Network Gateway ECU))

OK

REPLACE CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU) 2018 - 2020 MY Camry [06/2017 - 10/2020]; NETWORKING: NETWORK GATEWAY ECU: REMOVAL 2021 - 2022 MY Camry [10/2020 - 08/2022]; NETWORKING: NETWORK GATEWAY ECU: REMOVAL 2023 - 2024 MY Camry [08/2022 -        ]; NETWORKING: NETWORK GATEWAY ECU: REMOVAL

NG

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

4.

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

(a) Reconnect the A66 No. 1 CAN junction connector.

(b) Disconnect the R98 No. 5 CAN junction connector.

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

*a

Front view of wire harness connector

(to No. 5 CAN Junction Connector)

*b

to Central Gateway ECU (Network Gateway ECU)

*c

to No. 1 CAN Junction Connector

-

-

Standard Resistance:

Tester Connection

Condition

Specified Condition

Connected to

R98-1 (CANH) - R98-11 (CANL)

Cable disconnected from negative (-) battery terminal

108 to 132 Ω

Central gateway ECU (network gateway ECU)

R98-5 (CANH) - R98-15 (CANL)

Cable disconnected from negative (-) battery terminal

108 to 132 Ω

No. 1 CAN junction connector

Result

Proceed to

OK

A

NG (Line to No. 1 CAN junction connector)

B

NG (Line to central gateway ECU (network gateway ECU))

C

A

REPLACE NO. 5 CAN JUNCTION CONNECTOR

B

REPAIR OR REPLACE CAN MAIN BUS LINES OR CONNECTOR (NO. 5 CAN JUNCTION CONNECTOR - NO. 1 CAN JUNCTION CONNECTOR)

C

5.

CHECK FOR OPEN IN CAN MAIN BUS LINES (CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU) - NO. 5 CAN JUNCTION CONNECTOR)

(a) Reconnect the R98 No. 5 CAN junction connector.

(b) Disconnect the K76 central gateway ECU (network gateway ECU) connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

K76-23 (CA1H) - K76-9 (CAXH)

Cable disconnected from negative (-) battery terminal

Below 1 Ω

K76-8 (CA1L) - K76-24 (CAXL)

Cable disconnected from negative (-) battery terminal

Below 1 Ω

*a

Front view of wire harness connector

(to Central Gateway ECU (Network Gateway ECU))

OK

REPLACE CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU) 2018 - 2020 MY Camry [06/2017 - 10/2020]; NETWORKING: NETWORK GATEWAY ECU: REMOVAL 2021 - 2022 MY Camry [10/2020 - 08/2022]; NETWORKING: NETWORK GATEWAY ECU: REMOVAL 2023 - 2024 MY Camry [08/2022 -        ]; NETWORKING: NETWORK GATEWAY ECU: REMOVAL

NG

REPAIR OR REPLACE CAN MAIN BUS LINES OR CONNECTOR (CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU) - NO. 5 CAN JUNCTION CONNECTOR)

6.

CHECK FOR OPEN IN CAN MAIN BUS LINES (NO. 1 CAN JUNCTION CONNECTOR)

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

(b) Disconnect the A66 No. 1 CAN junction connector.

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

*a

Front view of wire harness connector

(to No. 1 CAN Junction Connector)

*b

to Central Gateway ECU (Network Gateway ECU)

Standard Resistance:

Tester Connection

Condition

Specified Condition

A66-3 (CANH) - A66-9 (CANL)

Cable disconnected from negative (-) battery terminal

108 to 132 Ω

A66-5 (CANH) - A66-11 (CANL)

Cable disconnected from negative (-) battery terminal

108 to 132 Ω

OK

REPLACE NO. 1 CAN JUNCTION CONNECTOR

NG

7.

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

(a) Reconnect the A66 No. 1 CAN junction connector.

(b) Disconnect the K76 central gateway ECU (network gateway ECU) connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

K76-23 (CA1H) - K76-9 (CAXH)

Cable disconnected from negative (-) battery terminal

Below 1 Ω

K76-8 (CA1L) - K76-24 (CAXL)

Cable disconnected from negative (-) battery terminal

Below 1 Ω

*a

Front view of wire harness connector

(to Central Gateway ECU (Network Gateway ECU))

OK

REPLACE CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU) 2018 - 2020 MY Camry [06/2017 - 10/2020]; NETWORKING: NETWORK GATEWAY ECU: REMOVAL 2021 - 2022 MY Camry [10/2020 - 08/2022]; NETWORKING: NETWORK GATEWAY ECU: REMOVAL 2023 - 2024 MY Camry [08/2022 -        ]; NETWORKING: NETWORK GATEWAY ECU: REMOVAL

NG

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