Last Modified: 11-20-2023 6.11:8.1.0 Doc ID: RM1000000012T49
Model Year Start: 2018 Model: Camry Prod Date Range: [03/2017 -           ]
Title: NETWORKING: CAN COMMUNICATION SYSTEM: Open in Bus 4 Main Bus Line; 2018 - 2024 MY Camry [03/2017 -        ]

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 sensor assembly
  • No. 2 CAN junction connector
  • No. 4 CAN 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 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 MY Camry [03/2017 - 06/2017]; INTRODUCTION: REPAIR INSTRUCTION: PRECAUTION 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 2018 MY Camry [03/2017 - 06/2017]; NETWORKING: CAN COMMUNICATION SYSTEM: DIAGNOSIS SYSTEM 2018 MY Camry [06/2017 - 08/2018]; NETWORKING: CAN COMMUNICATION SYSTEM: DIAGNOSIS SYSTEM 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 FOR OPEN IN CAN MAIN BUS LINES (NO. 3 JUNCTION CONNECTOR)

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

(b) Disconnect the R99 No. 3 junction connector.

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

*a

Front view of wire harness connector

(to No. 3 Junction Connector)

*b

to Central Gateway ECU (Network Gateway ECU)

*c

to No. 2 CAN Junction Connector

-

-

Standard Resistance:

Tester Connection

Condition

Specified Condition

Connected to

R99-10 (CANH) - R99-21 (CANL)

Cable disconnected from negative (-) battery terminal

108 to 132 Ω

Central gateway ECU (network gateway ECU)

R99-11 (CANH) - R99-22 (CANL)

Cable disconnected from negative (-) 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
A

REPLACE NO. 3 JUNCTION CONNECTOR
C

GO TO STEP 3

B

2.

CHECK FOR OPEN IN CAN MAIN BUS LINES (CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU) - NO. 3 JUNCTION CONNECTOR)

(a) Reconnect the R99 No. 3 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

K76-22 (CA2H) - K76-7 (CA2L)

Cable disconnected from negative (-) battery terminal

108 to 132 Ω

*a

Front view of wire harness connector

(to Central Gateway ECU (Network Gateway ECU))
OK

REPLACE CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU) 2018 MY Camry [03/2017 - 06/2017]; NETWORKING: NETWORK GATEWAY ECU: REMOVAL 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. 3 JUNCTION CONNECTOR)

3.

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

(a) Reconnect the R99 No. 3 junction connector.

(b) Disconnect the A67 No. 2 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. 2 CAN Junction Connector)

*b

to No. 3 Junction Connector

*c

to No. 4 CAN Junction Connector

-

-

Standard Resistance:

Tester Connection

Condition

Specified Condition

Connected to

A67-2 (CANH) - A67-13 (CANL)

Cable disconnected from negative (-) battery terminal

108 to 132 Ω

No. 3 junction connector

A67-5 (CANH) - A67-16 (CANL)

Cable disconnected from negative (-) battery terminal

108 to 132 Ω

No. 4 CAN junction connector

Result

Proceed to

OK

A

NG (Line to No. 3 junction connector)

B

NG (Line to No. 4 CAN junction connector)

C
A

REPLACE NO. 2 CAN JUNCTION CONNECTOR
B

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

4.

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

(a) Reconnect the A67 No. 2 CAN junction connector.

(b) Disconnect the K127 No. 4 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. 4 CAN Junction Connector)

*b

to No. 2 CAN Junction Connector

Standard Resistance:

Tester Connection

Condition

Specified Condition

Connected to

K127-6 (CANH) - K127-17 (CANL)

Cable disconnected from negative (-) battery terminal

108 to 132 Ω

No. 2 CAN junction connector
NG

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

5.

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

(a) Reconnect the K127 No. 4 CAN junction connector.

(b) Disconnect the K128 No. 4 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. 4 CAN Junction Connector)

*b

to Airbag Sensor Assembly

Standard Resistance:

Tester Connection

Condition

Specified Condition

Connected to

K128-6 (CANH) - K128-17 (CANL)

Cable disconnected from negative (-) battery terminal

108 to 132 Ω

Airbag sensor assembly
OK

REPLACE NO. 4 CAN JUNCTION CONNECTOR
NG

6.

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

(a) Reconnect the K128 No. 4 CAN junction connector.

(b) Disconnect the K73 airbag sensor assembly connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

K73-26 (CANH) - K73-27 (CANL)

Cable disconnected from negative (-) battery terminal

108 to 132 Ω

*a

Front view of wire harness connector

(to Airbag Sensor Assembly)
OK

REPLACE AIRBAG SENSOR ASSEMBLY 2018 MY Camry [03/2017 - 06/2017]; SUPPLEMENTAL RESTRAINT SYSTEMS: CENTER AIRBAG SENSOR ASSEMBLY: REMOVAL 2018 - 2019 MY Camry [06/2017 - 09/2019]; SUPPLEMENTAL RESTRAINT SYSTEMS: CENTER AIRBAG SENSOR ASSEMBLY: REMOVAL 2020 MY Camry [09/2019 - 03/2020]; SUPPLEMENTAL RESTRAINT SYSTEMS: CENTER AIRBAG SENSOR ASSEMBLY: REMOVAL 2020 MY Camry [03/2020 - 10/2020]; SUPPLEMENTAL RESTRAINT SYSTEMS: CENTER AIRBAG SENSOR ASSEMBLY: REMOVAL 2021 - 2024 MY Camry [10/2020 -        ]; SUPPLEMENTAL RESTRAINT SYSTEMS: CENTER AIRBAG SENSOR ASSEMBLY: REMOVAL

NG

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