Last Modified: 01-30-2024 6.11:8.1.0 Doc ID: RM100000001KYBP
Model Year Start: 2020 Model: RAV4 HV Prod Date Range: [10/2019 - 10/2022]
Title: NETWORKING: CAN COMMUNICATION SYSTEM (for HV Model): Check Bus 3 Line for Short to +B; 2020 - 2022 MY RAV4 HV [10/2019 - 10/2022]

Check Bus 3 Line for Short to +B

DESCRIPTION

There may be a short circuit between one of the CAN bus wires and +B when there is no resistance between terminal 6 (CA3H) of the central gateway ECU (network gateway ECU) and terminal 16 (BAT) of the DLC3, or terminal 21 (CA3L) of the central gateway ECU (network gateway ECU) and terminal 16 (BAT) of the DLC3, or terminal 19 (CAYH) of the central gateway ECU (network gateway ECU) and terminal 16 (BAT) of the DLC3, or terminal 20 (CAYL) of the central gateway ECU (network gateway ECU) and terminal 16 (BAT) of the DLC3.

Symptom

Trouble Area
*1: w/ Bus Buffer ECU

*2: for Radio and Display Type

*3: w/ Telematics System
  • There is no resistance between terminal 6 (CA3H) of the central gateway ECU (network gateway ECU) and terminal 16 (BAT) of the DLC3, or terminal 21 (CA3L) of the central gateway ECU (network gateway ECU) and terminal 16 (BAT) of the DLC3.
  • There is no resistance between terminal 19 (CAYH) of the central gateway ECU (network gateway ECU) and terminal 16 (BAT) of the DLC3, or terminal 20 (CAYL) of the central gateway ECU (network gateway ECU) and terminal 16 (BAT) of the DLC3.
  • Short to +B in CAN main bus wire
  • Short to +B in CAN branch wire
  • Central gateway ECU (network gateway ECU)
  • Bus buffer ECU*1
  • Radio and display receiver assembly*2
  • DCM (telephone transceiver assembly)*3
  • No. 5 CAN junction connector

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 2019 - 2024 MY RAV4 HV [02/2019 -        ]; NETWORKING: CAN COMMUNICATION SYSTEM (for HV Model): 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 (-) auxiliary 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 (-) 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 2019 - 2024 MY RAV4 RAV4 HV [11/2018 -        ]; INTRODUCTION: REPAIR INSTRUCTION: PRECAUTION

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

    Click here 2020 MY RAV4 RAV4 HV [10/2019 - 06/2020]; INTRODUCTION: REPAIR INSTRUCTION: INITIALIZATION 2020 MY RAV4 RAV4 HV [06/2020 - 08/2020]; INTRODUCTION: REPAIR INSTRUCTION: INITIALIZATION 2021 MY RAV4 RAV4 HV [08/2020 - 12/2021]; INTRODUCTION: REPAIR INSTRUCTION: INITIALIZATION 2022 MY RAV4 RAV4 HV [12/2021 - 10/2022]; 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 2020 MY RAV4 HV [10/2019 - 06/2020]; NETWORKING: CAN COMMUNICATION SYSTEM (for HV Model): DIAGNOSIS SYSTEM 2020 MY RAV4 HV [06/2020 - 08/2020]; NETWORKING: CAN COMMUNICATION SYSTEM (for HV Model): DIAGNOSIS SYSTEM 2021 MY RAV4 HV [08/2020 - 12/2021]; NETWORKING: CAN COMMUNICATION SYSTEM (for HV Model): DIAGNOSIS SYSTEM 2022 MY RAV4 HV [12/2021 - 10/2022]; NETWORKING: CAN COMMUNICATION SYSTEM (for HV Model): DIAGNOSIS SYSTEM

  • The following malfunctions may occur if a radio and display receiver assembly from another vehicle is installed to this vehicle. Therefore, when replacing the radio and display receiver assembly, be sure to replace it with new one.
    • Communication malfunction DTC is output
    • Does not operate normally

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 TO B+ IN CAN BUS WIRE (NO. 5 CAN JUNCTION CONNECTOR)

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

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

*a

Front view of wire harness connector

(to No. 5 CAN Junction Connector)

*b

to Bus Buffer ECU (w/ Bus Buffer ECU)

*c

to Central Gateway ECU (Network Gateway ECU)

*d

to DCM (Telephone Transceiver Assembly) (w/ Telematics System)

*e

to Central Gateway ECU (Network Gateway ECU)

*f

to Radio and Display Receiver Assembly (for Radio and Display Type)

*g

Front view of DLC3

-

-

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

Connected to
*1: w/ Bus Buffer ECU

*2: for Radio and Display Type

*3: w/ Telematics System

G105-1 (CANH) - G114-16 (BAT)

Cable disconnected from negative (-) auxiliary battery terminal

6 kΩ or higher

Bus buffer ECU*1

G105-12 (CANH) - G114-16 (BAT)

G105-2 (CANH) - G114-16 (BAT)

Cable disconnected from negative (-) auxiliary battery terminal

6 kΩ or higher

Central gateway ECU (network gateway ECU)

G105-13 (CANL) - G114-16 (BAT)

G105-3 (CANH) - G114-16 (BAT)

Cable disconnected from negative (-) auxiliary battery terminal

6 kΩ or higher

DCM (telephone transceiver assembly)*3

G105-14 (CANL) - G114-16 (BAT)

G105-4 (CANH) - G114-16 (BAT)

Cable disconnected from negative (-) auxiliary battery terminal

6 kΩ or higher

Central gateway ECU (network gateway ECU)

G105-15 (CANL) - G114-16 (BAT)

G105-5 (CANH) - G114-16 (BAT)

Cable disconnected from negative (-) auxiliary battery terminal

6 kΩ or higher

Radio and display receiver assembly*2

G105-16 (CANL) - G114-16 (BAT)

Result

Proceed to

OK

A

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

B

NG (Wire to ECU or sensor)

C
A

REPLACE NO. 5 CAN JUNCTION CONNECTOR
C

GO TO STEP 3

B

2.

CHECK FOR SHORT TO B+ IN CAN BUS WIRE (CENTRAL GATEWAY ECU [NETWORK GATEWAY ECU] - NO. 5 CAN JUNCTION CONNECTOR)

(a) Reconnect the G105 No. 5 CAN junction connector.

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

*a

Front view of wire harness connector

(to Central Gateway ECU [Network Gateway ECU])

*b

Front view of DLC3

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

G72-6 (CA3H) - G114-16 (BAT)

Cable disconnected from negative (-) auxiliary battery terminal

6 kΩ or higher

G72-21 (CA3L) - G114-16 (BAT)
OK

REPLACE CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU) 2020 MY RAV4 RAV4 HV [10/2019 - 08/2020]; NETWORKING: NETWORK GATEWAY ECU: REMOVAL 2021 MY RAV4 RAV4 HV [08/2020 - 12/2021]; NETWORKING: NETWORK GATEWAY ECU: REMOVAL 2022 MY RAV4 RAV4 HV [12/2021 - 10/2022]; NETWORKING: NETWORK GATEWAY ECU: REMOVAL

NG

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

3.

CHECK FOR SHORT TO B+ IN CAN BUS WIRE (ECU, SENSOR)

(a) Reconnect all wire harness connectors.

(b) Disconnect the connector that includes terminals CANH and CANL from the ECU or sensor to which the bus wire shorted to +B is connected.

Click here 2020 MY RAV4 HV [10/2019 - 06/2020]; NETWORKING: CAN COMMUNICATION SYSTEM (for HV Model): TERMINALS OF ECU 2020 MY RAV4 HV [06/2020 - 08/2020]; NETWORKING: CAN COMMUNICATION SYSTEM (for HV Model): TERMINALS OF ECU 2021 MY RAV4 HV [08/2020 - 12/2021]; NETWORKING: CAN COMMUNICATION SYSTEM (for HV Model): TERMINALS OF ECU 2022 MY RAV4 HV [12/2021 - 10/2022]; NETWORKING: CAN COMMUNICATION SYSTEM (for HV Model): TERMINALS OF ECU

*a

Component with harness connected

(Central Gateway ECU [Network Gateway ECU])

*b

Front view of DLC3

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

G72-6 (CA3H) - G114-16 (BAT)

Cable disconnected from negative (-) auxiliary battery terminal

6 kΩ or higher

G72-21 (CA3L) - G114-16 (BAT)

HINT:

  • If the resistance changes to 6 kΩ or higher when the connector is disconnected from the ECU or sensor, there may be a short in the ECU or sensor.
  • If the resistance does not become normal when the connector is disconnected from the ECU or sensor, check for a short to +B in the wire harness and repair or replace the wire harness or connector if necessary.
OK

REPLACE ECU OR SENSOR
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR