Last Modified: 05-08-2025 6.11:8.1.0 Doc ID: RM100000001R23B
Model Year Start: 2021 Model: RAV4 Prod Date Range: [08/2020 -           ]
Title: NETWORKING: CAN COMMUNICATION SYSTEM (for Gasoline Model): Check Bus 4 Lines for Short Circuit; 2021 - 2025 MY RAV4 [08/2020 -        ]

Check Bus 4 Lines for Short Circuit

DESCRIPTION

There may be a short circuit between the CAN main bus wire and/or CAN branch wire when the resistance between terminals 22 (CA2H) and 7 (CA2L) of the central gateway ECU (network gateway ECU) is below 54 Ω.

Symptom

Trouble Area
*1: for AWD

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

Resistance between terminals 22 (CA2H) and 7 (CA2L) of the central gateway ECU (network gateway ECU) is below 54 Ω.
  • Short in CAN main bus wire
  • Short 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 - 2025 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 10 minutes 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 - 2025 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 - 2025 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 - 11/2024]; NETWORKING: CAN COMMUNICATION SYSTEM (for Gasoline Model): DIAGNOSIS SYSTEM 2025 MY RAV4 [11/2024 -        ]; 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 FOR SHORT IN CAN BUS WIRES (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

(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) - G96-20 (CANL)

Cable disconnected from negative (-) battery terminal

108 to 132 Ω

No. 4 CAN junction connector

G96-10 (CANH) - G96-21 (CANL)

Cable disconnected from negative (-) battery terminal

108 to 132 Ω

No. 6 CAN junction connector

G96-11 (CANH) - G96-22 (CANL)

Cable disconnected from negative (-) battery terminal

200 Ω or higher

Steering sensor

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 3

D

GO TO STEP 6

B

2.

CHECK FOR SHORT IN CAN BUS WIRES (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

-

-

(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) - M31-7 (CANL)

Cable disconnected from negative (-) battery terminal

200 Ω or higher

Tire pressure warning ECU and receiver*

M31-2 (CANH) - M31-8 (CANL)

Cable disconnected from negative (-) battery terminal

200 Ω or higher

Occupant detection ECU

M31-3 (CANH) - M31-9 (CANL)

Cable disconnected from negative (-) battery terminal

108 to 132 Ω

Central gateway ECU (network gateway ECU)

M31-4 (CANH) - M31-10 (CANL)

Cable disconnected from negative (-) battery terminal

108 to 132 Ω

No. 1 CAN junction connector

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
B

GO TO STEP 4

C

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

GO TO STEP 6

3.

CHECK FOR SHORT IN CAN BUS WIRES (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

(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) - G104-7 (CANL)

Cable disconnected from negative (-) battery terminal

200 Ω or higher

Brake actuator assembly (skid control ECU)

G104-2 (CANH) - G104-8 (CANL)

Cable disconnected from negative (-) battery terminal

108 to 132 Ω

Airbag ECU assembly

G104-3 (CANH) - G104-9 (CANL)

Cable disconnected from negative (-) battery terminal

200 Ω or higher

4WD ECU assembly*

G104-4 (CANH) - G104-10 (CANL)

Cable disconnected from negative (-) battery terminal

108 to 132 Ω

No. 1 CAN junction connector

G104-5 (CANH) - G104-11 (CANL)

Cable disconnected from negative (-) battery terminal

200 Ω or higher

Rack and pinion power steering gear assembly

Result

Proceed to

OK

A

NG (Airbag ECU assembly CAN main wire)

B

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

C

NG (Wire to ECU or sensor)

D
A

REPLACE NO. 4 CAN JUNCTION CONNECTOR
B

GO TO STEP 5

C

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

GO TO STEP 6

4.

CHECK FOR SHORT IN CAN BUS WIRES (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])

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

G72-22 (CA2H) - G72-7 (CA2L)

Cable disconnected from negative (-) battery terminal

108 to 132 Ω
OK

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NG

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

5.

CHECK FOR SHORT IN CAN BUS WIRES (AIRBAG ECU ASSEMBLY - NO. 4 CAN JUNCTION CONNECTOR)

(a) Reconnect the G104 No. 4 CAN junction connector.

(b) Disconnect the airbag ECU assembly connector.

Click here 2021 - 2025 MY RAV4 RAV4 HV [08/2020 -        ]; SUPPLEMENTAL RESTRAINT SYSTEMS: AIRBAG SYSTEM: PRECAUTION

*a

Front view of wire harness connector

(to Airbag ECU Assembly)

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

G70-26 (CANH) - G70-27 (CANL)

Cable disconnected from negative (-) battery terminal

108 to 132 Ω
OK

REPLACE AIRBAG ECU ASSEMBLY 2021 MY RAV4 RAV4 HV [08/2020 - 12/2021]; SUPPLEMENTAL RESTRAINT SYSTEMS: CENTER AIRBAG SENSOR ASSEMBLY: REMOVAL 2022 MY RAV4 RAV4 HV [12/2021 - 10/2022]; SUPPLEMENTAL RESTRAINT SYSTEMS: CENTER AIRBAG SENSOR ASSEMBLY: REMOVAL 2023 MY RAV4 RAV4 HV [10/2022 - 10/2023]; SUPPLEMENTAL RESTRAINT SYSTEMS: CENTER AIRBAG SENSOR ASSEMBLY: REMOVAL 2024 - 2025 MY RAV4 RAV4 HV [10/2023 -        ]; SUPPLEMENTAL RESTRAINT SYSTEMS: CENTER AIRBAG SENSOR ASSEMBLY: REMOVAL

NG

REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (AIRBAG ECU ASSEMBLY - NO. 4 CAN JUNCTION CONNECTOR)

6.

CHECK FOR SHORT IN CAN BUS WIRES (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 circuited branch line 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 - 2025 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])

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

G72-22 (CA2H) - G72-7 (CA2L)

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.
  • If the resistance does not become normal when the connector is disconnected from the ECU or sensor, check for a short 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