Last Modified: 04-05-2023 6.11:8.1.0 Doc ID: RM1000000018DNG
Model Year Start: 2018 Model: Sienna Prod Date Range: [11/2017 - 08/2018]
Title: NETWORKING: CAN COMMUNICATION SYSTEM: Check Bus 5 Lines for Short Circuit; 2018 MY Sienna [11/2017 - 08/2018]

Check Bus 5 Lines for Short Circuit

DESCRIPTION

There may be a short circuit between the bus 5 CAN main wires and/or CAN branch wires when the resistance between terminals 15 (CA5H) and 16 (CA5L) of the central gateway ECU (network gateway ECU) is below 54 Ω.

Detection Item

Trouble Area

Resistance between terminals 15 (CA5H) and 16 (CA5L) of central gateway ECU (network gateway ECU) is below 54 Ω.
  • Short in bus 5 CAN main wires
  • Short in bus 5 CAN branch wires
  • Central gateway ECU (network gateway ECU)
  • Driving support ECU assembly*1
  • Millimeter wave radar sensor assembly*1
  • Clearance warning ECU assembly*2
  • Parking assist ECU*3
  • Forward recognition camera*1
  • Rear television camera assembly*3
  • Blind Spot Monitor Sensor RH*4
  • No. 2 CAN junction connector
  • No. 3 CAN junction connector
  • No. 2 CAN junction terminal
  • *1: w/ Toyota Safety Sense P
  • *2: w/ Intuitive Parking Assist System
  • *3: w/ Panoramic View Monitor System
  • *4: w/ Blind Spot Monitor System

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 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 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

  • When replacing the combination meter assembly, always replace it with a new one. If a combination meter assembly which was installed to another vehicle is used, the information stored in it will not match the information from the vehicle and a DTC may be stored.

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 SHORT IN CAN BUS WIRES (CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU) - NO. 2 CAN JUNCTION CONNECTOR)

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

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

*a

Front view of wire harness connector

(to Central Gateway ECU (Network Gateway ECU))

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

D202-15 (CA5H) - D202-16 (CA5L)

Cable disconnected from negative (-) battery terminal

108 to 132 Ω
OK

REPLACE CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU)

NG

2.

CONNECT CONNECTOR

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

NEXT

3.

CHECK FOR SHORT IN CAN BUS WIRES (NO. 2 CAN JUNCTION TERMINAL - NO. 3 CAN JUNCTION CONNECTOR)

(a) Disconnect the No. 2 CAN junction terminal connector.

*a

Front view of wire harness connector

(to No. 2 CAN Junction Terminal)

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

K45-3 (CANH) - K45-2 (CANL)

Cable disconnected from negative (-) battery terminal

108 to 132 Ω
OK

REPLACE NO. 2 CAN JUNCTION TERMINAL
NG

4.

CONNECT CONNECTOR

(a) Reconnect the K45 No. 2 CAN junction terminal connector.

NEXT

5.

CHECK FOR SHORT IN CAN BUS WIRES (NO. 2 CAN JUNCTION CONNECTOR)

(a) Disconnect the No. 2 CAN junction connector.

*1

No. 2 CAN Junction Connector

-

-

*a

Rear view of wire harness connector

(to No. 3 CAN Junction Connector)

-

-

Code

Color (CANH Side)

Color (CANL Side)

Connect to

D205

B

W

No. 3 CAN junction connector

D206

V

W

Central Gateway ECU (Network Gateway ECU)

D207

GR

W

Millimeter Wave Radar Sensor Assembly*1

D208

G

W

Forward Recognition Camera*1

D209

P

W

Blind Spot Monitor Sensor RH*2

D210

LG

W

Clearance Warning ECU Assembly*3

D211

L

W

Parking Assist ECU*4

D212

R

W

Driving Support ECU Assembly*1
  • *1: Pre-collision System
  • *2: Blind Spot Monitor System
  • *3: w/ Intuitive Parking Assist System
  • *4: Panoramic View Monitor System

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

Connect to

D205-1 (CANH) - D205-2 (CANL)

Cable disconnected from negative (-) battery terminal

108 to 132 Ω

No. 3 CAN junction connector

D206-1 (CANH) - D206-2 (CANL)

Cable disconnected from negative (-) battery terminal

108 to 132 Ω

Central gateway ECU (network gateway ECU)

D207-1 (CANH) - D207-2 (CANL)

Cable disconnected from negative (-) battery terminal

200 Ω or higher

Millimeter wave radar sensor assembly*1

D208-1 (CANH) - D208-2 (CANL)

Cable disconnected from negative (-) battery terminal

200 Ω or higher

Forward recognition camera*1

D209-1 (CANH) - D209-2 (CANL)

Cable disconnected from negative (-) battery terminal

200 Ω or higher

Blind spot monitor sensor RH*2

D210-1 (CANH) - D210-2 (CANL)

Cable disconnected from negative (-) battery terminal

200 Ω or higher

Clearance warning ECU assembly*3

D211-1 (CANH) - D211-2 (CANL)

Cable disconnected from negative (-) battery terminal

200 Ω or higher

Parking assist ECU*4

D212-1 (CANH) - D212-2 (CANL)

Cable disconnected from negative (-) battery terminal

200 Ω or higher

Driving support ECU assembly*1
  • *1: w/ Toyota Safety Sense P
  • *2: Blind Spot Monitor System
  • *3: w/ Intuitive Parking Assist System
  • *4: w/ Panoramic View Monitor System

Result

Result

Proceed to

OK

A

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

B

NG (No. 3 CAN junction connector CAN main wire)

C

NG (ECU or sensor CAN branch wires)

D
A

REPLACE NO. 2 CAN JUNCTION CONNECTOR
B

REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (NO. 2 CAN JUNCTION CONNECTOR - CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU))
D

GO TO STEP 8

C

6.

CONNECT CONNECTOR

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

NEXT

7.

CHECK FOR SHORT IN CAN BUS WIRES (NO. 3 CAN JUNCTION CONNECTOR)

(a) Disconnect the No. 3 CAN junction connectors.

*1

No. 3 CAN Junction Connector

-

-

*a

Rear view of wire harness connector

(to No. 2 CAN Junction Connector)

-

-

Code

Color (CANH Side)

Color (CANL Side)

Connect to

K46

B

W

No. 2 CAN Junction Connector

K47

L

W

No. 2 CAN Junction Terminal

K48

P

W

Rear Television Camera Assembly*
  • *: w/ Panoramic View Monitor System

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

Connect to

K46-1 (CANH) - K46-2 (CANL)

Cable disconnected from negative (-) battery terminal

108 to 132 Ω

No. 2 CAN junction connector

K47-1 (CANH) - K47-2 (CANL)

Cable disconnected from negative (-) battery terminal

108 to 132 Ω

No. 2 CAN junction terminal

K48-1 (CANH) - K48-2 (CANL)

Cable disconnected from negative (-) battery terminal

200 Ω or higher

Rear television camera assembly*
  • *: w/ Panoramic View Monitor System

Result

Result

Proceed to

OK

A

NG (No. 2 CAN junction connector CAN main wire)

B

NG (No. 2 CAN junction terminal CAN main wire)

C

NG (ECU or sensor CAN branch wires)

D
A

REPLACE NO. 3 CAN JUNCTION CONNECTOR
B

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

REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (NO. 3 CAN JUNCTION CONNECTOR - NO. 2 CAN JUNCTION TERMINAL)
D

8.

CHECK FOR SHORT IN CAN BUS WIRES (ECU, SENSOR)

(a) Reconnect the CAN junction connector.

*a

Component with harness connected

(Central Gateway ECU (Network Gateway ECU))

(b) Disconnect the connector that includes terminals CANH and CANL from the ECU or sensor to which the short circuited CAN branch wire is connected.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

D202-15 (CA5H) - D202-16 (CA5L)

Cable disconnected from negative (-) battery terminal

54 to 69 Ω

HINT:

If the resistance becomes normal (between 54 and 69 Ω) when the connector is disconnected from the ECU or sensor, there may be a short in the ECU or sensor.

OK

REPLACE CORRESPONDING ECU OR SENSOR
NG

REPAIR OR REPLACE CORRESPONDING ECU OR SENSOR CAN BRANCH WIRES OR CONNECTOR