Last Modified: 01-30-2024 6.11:8.1.0 Doc ID: RM100000001R23C
Model Year Start: 2021 Model: RAV4 Prod Date Range: [08/2020 -           ]
Title: NETWORKING: CAN COMMUNICATION SYSTEM (for Gasoline Model): Check Bus 4 Line for Short to +B; 2021 - 2024 MY RAV4 [08/2020 -        ]

Check Bus 4 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 22 (CA2H) of the central gateway ECU (network gateway ECU) and terminal 16 (BAT) of the DLC3, or terminal 7 (CA2L) of the central gateway ECU (network gateway ECU) and terminal 16 (BAT) of the DLC3

Symptom

Trouble Area
*1: for AWD

*2: w/ Tire Pressure Warning System (Tire Inflation Pressure Display Function)

There is no resistance between terminal 22 (CA2H) of the central gateway ECU (network gateway ECU) and terminal 16 (BAT) of the DLC3, or terminal 7 (CA2L) 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)
  • Steering sensor
  • Occupant detection ECU
  • Rack and pinion power steering gear assembly
  • Brake actuator assembly (skid control ECU)
  • 4WD ECU assembly*1
  • Airbag ECU assembly
  • Tire pressure warning ECU and receiver*2
  • No. 1 CAN junction connector
  • No. 4 CAN junction connector
  • No. 6 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 [11/2018 -        ]; NETWORKING: CAN COMMUNICATION SYSTEM (for Gasoline 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 (-) 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 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 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 2023 MY RAV4 RAV4 HV [10/2022 - 10/2023]; INTRODUCTION: REPAIR INSTRUCTION: INITIALIZATION 2024 MY RAV4 RAV4 HV [10/2023 -        ]; 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 2021 MY RAV4 [08/2020 - 12/2021]; NETWORKING: CAN COMMUNICATION SYSTEM (for Gasoline Model): DIAGNOSIS SYSTEM 2022 MY RAV4 [12/2021 - 10/2022]; NETWORKING: CAN COMMUNICATION SYSTEM (for Gasoline Model): DIAGNOSIS SYSTEM 2023 MY RAV4 [10/2022 - 10/2023]; NETWORKING: CAN COMMUNICATION SYSTEM (for Gasoline Model): DIAGNOSIS SYSTEM 2024 MY RAV4 [10/2023 -        ]; NETWORKING: CAN COMMUNICATION SYSTEM (for Gasoline Model): DIAGNOSIS SYSTEM

HINT:

  • Operating the ignition switch, any switches or any doors triggers related ECU and sensor communication with the CAN, which causes resistance variation.
  • Even after DTCs are cleared, if a DTC is stored again after driving the vehicle for a while, the malfunction may be occurring due to vibration of the vehicle. In such a case, wiggling the ECUs or wire harness while performing the inspection below may help determine the cause of the malfunction.

PROCEDURE

1.

CHECK SHORT TO B+ IN CAN BUS WIRE (NO. 1 CAN JUNCTION CONNECTOR)

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

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

*a

Front view of wire harness connector

(to No. 1 CAN Junction Connector)

*b

to No. 4 CAN Junction Connector

*c

to No. 6 CAN Junction Connector

*d

to Steering Sensor

*e

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

G96-9 (CANH) - G114-16 (BAT)

Cable disconnected from negative (-) battery terminal

6 kΩ or higher

No. 4 CAN junction connector

G96-20 (CANL) - G114-16 (BAT)

G96-10 (CANH) - G114-16 (BAT)

Cable disconnected from negative (-) battery terminal

6 kΩ or higher

No. 6 CAN junction connector

G96-21 (CANL) - G114-16 (BAT)

G96-11 (CANH) - G114-16 (BAT)

Cable disconnected from negative (-) battery terminal

6 kΩ or higher

Steering sensor

G96-22 (CANL) - G114-16 (BAT)

Result

Proceed to

OK

A

NG (No. 6 CAN junction connector CAN main wire)

B

NG (No. 4 CAN junction connector CAN main wire)

C

NG (Wire to ECU or sensor)

D
A

REPLACE NO. 1 CAN JUNCTION CONNECTOR
C

GO TO STEP 4

D

GO TO STEP 5

B

2.

CHECK SHORT TO B+ IN CAN BUS WIRE (NO. 6 CAN JUNCTION CONNECTOR)

(a) Reconnect the G96 No. 1 CAN junction connector.

(b) Disconnect the No. 6 CAN junction connector.

*a

Front view of wire harness connector

(to No. 6 CAN Junction Connector)

*b

to Tire Pressure Warning ECU and Receiver (w/ Tire Pressure Warning System [Tire Inflation Pressure Display Function])

*c

to Occupant Detection ECU

*d

to Central Gateway ECU (Network Gateway ECU)

*e

to No. 1 CAN Junction Connector

*f

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
*: w/ Tire Pressure Warning System (Tire Inflation Pressure Display Function)

M31-1 (CANH) - G114-16 (BAT)

Cable disconnected from negative (-) battery terminal

6 kΩ or higher

Tire pressure warning ECU and receiver*

M31-7 (CANL) - G114-16 (BAT)

M31-2 (CANH) - G114-16 (BAT)

Cable disconnected from negative (-) battery terminal

6 kΩ or higher

Occupant detection ECU

M31-8 (CANL) - G114-16 (BAT)

M31-3 (CANH) - G114-16 (BAT)

Cable disconnected from negative (-) battery terminal

6 kΩ or higher

Central gateway ECU (network gateway ECU)

M31-9 (CANL) - G114-16 (BAT)

M31-4 (CANH) - G114-16 (BAT)

Cable disconnected from negative (-) battery terminal

6 kΩ or higher

No. 1 CAN junction connector

M31-10 (CANL) - G114-16 (BAT)

Result

Proceed to

OK

A

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

B

NG (No. 1 CAN junction connector CAN main wire)

C

NG (Wire to ECU or sensor)

D
A

REPLACE NO. 6 CAN JUNCTION CONNECTOR
C

REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (NO. 6 CAN JUNCTION CONNECTOR - NO. 1 CAN JUNCTION CONNECTOR)
D

GO TO STEP 5

B

3.

CHECK SHORT TO B+ IN CAN BUS WIRE (CENTRAL GATEWAY ECU [NETWORK GATEWAY ECU] - NO. 6 CAN JUNCTION CONNECTOR)

(a) Reconnect the M31 No. 6 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

G72-22 (CA2H) - G114-16 (BAT)

Cable disconnected from negative (-) battery terminal

6 kΩ or higher

G72-7 (CA2L) - G114-16 (BAT)
OK

REPLACE CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU) 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 2023 MY RAV4 RAV4 HV [10/2022 - 10/2023]; NETWORKING: NETWORK GATEWAY ECU: REMOVAL 2024 MY RAV4 RAV4 HV [10/2023 -        ]; NETWORKING: NETWORK GATEWAY ECU: REMOVAL

NG

REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (CENTRAL GATEWAY ECU [NETWORK GATEWAY ECU] - NO. 6 CAN JUNCTION CONNECTOR)

4.

CHECK SHORT TO B+ IN CAN BUS WIRE (NO. 4 CAN JUNCTION CONNECTOR)

(a) Reconnect the G96 No. 1 CAN junction connector.

(b) Disconnect the No. 4 CAN junction connector.

*a

Front view of wire harness connector

(to No. 4 CAN Junction Connector)

*b

to Brake Actuator Assembly (Skid Control ECU)

*c

to Airbag ECU Assembly

*d

to 4WD ECU Assembly (for AWD)

*e

to No. 1 CAN Junction Connector

*f

to Rack and Pinion Power Steering Gear Assembly

*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
*: for AWD

G104-1 (CANH) - G114-16 (BAT)

Cable disconnected from negative (-) battery terminal

6 kΩ or higher

Brake actuator assembly (skid control ECU)

G104-7 (CANL) - G114-16 (BAT)

G104-2 (CANH) - G114-16 (BAT)

Cable disconnected from negative (-) battery terminal

6 kΩ or higher

Airbag ECU assembly

G104-8 (CANL) - G114-16 (BAT)

G104-3 (CANH) - G114-16 (BAT)

Cable disconnected from negative (-) battery terminal

6 kΩ or higher

4WD ECU assembly*

G104-9 (CANL) - G114-16 (BAT)

G104-4 (CANH) - G114-16 (BAT)

Cable disconnected from negative (-) battery terminal

6 kΩ or higher

No. 1 CAN junction connector

G104-10 (CANL) - G114-16 (BAT)

G104-5 (CANH) - G114-16 (BAT)

Cable disconnected from negative (-) battery terminal

6 kΩ or higher

Rack and pinion power steering gear assembly

G104-11 (CANL) - G114-16 (BAT)

Result

Proceed to

OK

A

NG (No. 1 CAN junction connector CAN main wire)

B

NG (Wire to ECU or sensor)

C
A

REPLACE NO. 4 CAN JUNCTION CONNECTOR
B

REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (NO. 4 CAN JUNCTION CONNECTOR - NO. 1 CAN JUNCTION CONNECTOR)
C

GO TO STEP 5

5.

CHECK 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 short to +B is connected.

Click here 2021 MY RAV4 [08/2020 - 12/2021]; NETWORKING: CAN COMMUNICATION SYSTEM (for Gasoline Model): TERMINALS OF ECU 2022 MY RAV4 [12/2021 - 10/2022]; NETWORKING: CAN COMMUNICATION SYSTEM (for Gasoline Model): TERMINALS OF ECU 2023 MY RAV4 [10/2022 - 10/2023]; NETWORKING: CAN COMMUNICATION SYSTEM (for Gasoline Model): TERMINALS OF ECU 2024 MY RAV4 [10/2023 -        ]; NETWORKING: CAN COMMUNICATION SYSTEM (for Gasoline 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

G72-22 (CA2H) - G114-16 (BAT)

Cable disconnected from negative (-) battery terminal

6 kΩ or higher

G72-7 (CA2L) - 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

REPAIR ECU OR SENSOR
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR