Last Modified: 04-05-2023 6.11:8.1.0 Doc ID: RM1000000018DN5
Model Year Start: 2018 Model: Sienna Prod Date Range: [11/2017 -           ]
Title: NETWORKING: CAN COMMUNICATION SYSTEM: Open in Bus 2 Main Bus Line; 2018 - 2020 MY Sienna [11/2017 -        ]

Open in Bus 2 Main Bus Line

DESCRIPTION

There may be an open circuit in one of the bus 2 main lines and/or a central gateway ECU (network gateway ECU) CAN branch wire when the resistance between terminals 18 (CA4H) and 17 (CA4L) of the central gateway ECU (network gateway ECU) is 70 Ω or higher

Detection Item

Trouble Area

Resistance between terminals 18 (CA4H) and 17 (CA4L) of central gateway ECU (network gateway ECU) is 70 Ω or higher.

  • Bus 2 CAN main wire or connector
  • Bus 2 CAN branch wire or connector
  • ECM
  • Combination meter assembly
  • Central gateway ECU (network gateway ECU)
  • No. 5 junction connector
  • No. 6 junction connector

This malfunction is not related to the lines of a bus 2 branch except the central gateway ECU (network gateway ECU) CAN branch wires or to ECUs or sensors connected a bus 2 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 - 2020 MY Sienna [11/2017 -        ]; NETWORKING: CAN COMMUNICATION SYSTEM: HOW TO PROCEED WITH TROUBLESHOOTING

  • 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, 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 notice before proceeding with work.

    Click here 2017 - 2020 MY Sienna [08/2016 -        ]; INTRODUCTION: REPAIR INSTRUCTION: PRECAUTION

  • Some parts must be initialized and set when replacing or removing and installing parts.

    Click here 2018 - 2020 MY Sienna [11/2017 -        ]; INTRODUCTION: REPAIR INSTRUCTION: INITIALIZATION

  • 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 Sienna [11/2017 - 08/2018]; NETWORKING: CAN COMMUNICATION SYSTEM: DIAGNOSIS SYSTEM 2019 - 2020 MY Sienna [08/2018 -        ]; NETWORKING: CAN COMMUNICATION SYSTEM: DIAGNOSIS SYSTEM

  • Before replacing the ECM, refer to Registration.

    Click here 2017 - 2020 MY Sienna [08/2016 -        ]; THEFT DETERRENT / KEYLESS ENTRY: ENGINE IMMOBILISER SYSTEM(w/ Smart Key System): REGISTRATION

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 WIRE (COMBINATION METER ASSEMBLY - NO. 5 JUNCTION CONNECTOR)

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

(b) Disconnect the combination meter assembly connector.

*a

Front view of wire harness connector

(to Combination Meter Assembly)

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

D145-17 (CANH) - D145-16 (CANL)

Cable disconnected from negative (-) battery terminal

108 to 132 Ω

OK

REPLACE COMBINATION METER ASSEMBLY

NG

2.

CONNECT CONNECTOR

(a) Reconnect the D145 combination meter assembly connector.

NEXT

3.

CHECK FOR OPEN IN CAN BUS WIRE (ECM - NO. 6 JUNCTION CONNECTOR)

(a) Disconnect the ECM connector.

*a

Front view of wire harness connector

(to ECM)

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

A69-13 (CANH) - A69-26 (CANL)

Cable disconnected from negative (-) battery terminal

108 to 132 Ω

OK

REPLACE ECM

NG

4.

CONNECT CONNECTOR

(a) Reconnect the A69 ECM connector.

NEXT

5.

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

(a) Disconnect the central gateway ECU (network gateway ECU) connector.

*a

Front view of wire harness connector

(to Central Gateway ECU (Network Gateway ECU))

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

D202-18 (CA4H) - D202-17 (CA4L)

Cable disconnected from negative (-) battery terminal

54 to 69 Ω

OK

REPLACE CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU)

NG

6.

CONNECT CONNECTOR

(a) Reconnect the D202 central gateway ECU (network gateway ECU) connector.

NEXT

7.

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

(a) Disconnect the No. 5 junction connector.

*a

Front view of wire harness connector

(No. 5 Junction Connector)

*b

to No. 6 Junction Connector

*c

to Combination Meter Assembly

*d

to Central Gateway ECU (Network Gateway ECU)

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

Connect to

D179-8 (CANH) - D179-19 (CANL)

Cable disconnected from negative (-) battery terminal

108 to 132 Ω

No. 6 junction connector

D179-7 (CANH) - D179-18 (CANL)

Cable disconnected from negative (-) battery terminal

108 to 132 Ω

Combination meter assembly

D179-5 (CANH) - D179-16 (CANL)

Cable disconnected from negative (-) battery terminal

54 to 69 Ω

Central gateway ECU (network gateway ECU)

Result

Result

Proceed to

OK

A

NG (Combination meter assembly CAN main wire)

B

NG (Central gateway ECU (network gateway ECU) CAN branch wire)

C

NG (No. 6 junction connector CAN main wire)

D

A

REPLACE NO. 5 CAN JUNCTION CONNECTOR

B

REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (NO. 5 CAN JUNCTION CONNECTOR - COMBINATION METER ASSEMBLY)

C

REPAIR OR REPLACE CAN BRANCH WIRE OR CONNECTOR (NO. 5 CAN JUNCTION CONNECTOR - CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU))

D

8.

CONNECT CONNECTOR

(a) Reconnect the D179 No. 5 junction connector.

NEXT

9.

CHECK FOR OPEN IN CAN BUS WIRE (NO. 6 CAN JUNCTION CONNECTOR)

(a) Disconnect the No. 6 junction connector.

*a

Front view of wire harness connector

(to No. 6 Junction Connector)

*b

to No. 5 Junction Connector

*c

to ECM

-

-

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

Connect to

D180-1 (CANH) - D180-12 (CANL)

Cable disconnected from negative (-) battery terminal

108 to 132 Ω

No. 5 junction connector

D180-7 (CANH) - D180-18 (CANL)

Cable disconnected from negative (-) battery terminal

108 to 132 Ω

ECM

Result

Result

Proceed to

OK

A

NG (ECM CAN main wire)

B

NG (No. 5 junction connector CAN main wire)

C

A

REPLACE NO. 6 JUNCTION CONNECTOR

B

REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (NO. 6 JUNCTION CONNECTOR - ECM)

C

REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (NO. 6 JUNCTION CONNECTOR - NO. 5 JUNCTION CONNECTOR)