Last Modified: 01-30-2024 6.11:8.1.0 Doc ID: RM100000001H5J8
Model Year Start: 2019 Model: RAV4 HV Prod Date Range: [02/2019 - 08/2020]
Title: NETWORKING: CAN COMMUNICATION SYSTEM (for HV Model): Check Bus 4 Lines for Short Circuit; 2019 - 2020 MY RAV4 HV [02/2019 - 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: w/ Tire Pressure System (Tire Inflation Pressure Display Function)

*2: w/ Occupant Classification System

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)
  • Airbag ECU assembly
  • ECM
  • Steering sensor
  • Rack and pinion power steering gear assembly
  • Brake booster with master cylinder assembly (skid control ECU)
  • Parking brake ECU assembly
  • Hybrid vehicle control ECU assembly
  • Tire pressure warning ECU and receiver*1
  • Occupant detection ECU*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 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 2019 MY RAV4 RAV4 HV [02/2019 - 10/2019]; INTRODUCTION: REPAIR INSTRUCTION: INITIALIZATION 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

  • 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 2019 MY RAV4 HV [02/2019 - 10/2019]; NETWORKING: CAN COMMUNICATION SYSTEM (for HV Model): DIAGNOSIS SYSTEM 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

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 (NO. 1 CAN JUNCTION CONNECTOR)

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

108 to 132 Ω

No. 4 CAN junction connector

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

Cable disconnected from negative (-) auxiliary battery terminal

108 to 132 Ω

No. 6 CAN junction connector

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

Cable disconnected from negative (-) auxiliary 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 System [Tire Inflation Pressure Display Function])

*c

to Occupant Detection ECU (w/ Occupant Classification System)

*d

to Central Gateway ECU (Network Gateway ECU)

*e

to No. 1 CAN Junction Connector

*f

to Parking Brake ECU Assembly

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

Connected to
*1: w/ Tire Pressure System (Tire Inflation Pressure Display Function)

*2: w/ Occupant Classification System

M31-1 (CANH) - M31-7 (CANL)

Cable disconnected from negative (-) auxiliary battery terminal

200 Ω or higher

Tire pressure warning ECU and receiver*1

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

Cable disconnected from negative (-) auxiliary battery terminal

200 Ω or higher

Occupant detection ECU*2

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

Cable disconnected from negative (-) auxiliary battery terminal

108 to 132 Ω

Central gateway ECU (network gateway ECU)

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

Cable disconnected from negative (-) auxiliary battery terminal

108 to 132 Ω

No. 1 CAN junction connector

M31-5 (CANH) - M31-11 (CANL)

Cable disconnected from negative (-) auxiliary battery terminal

200 Ω or higher

Parking brake ECU assembly

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 Booster with Master Cylinder Assembly (Skid Control ECU)

*c

to Airbag ECU Assembly

*d

to Hybrid Vehicle Control ECU Assembly

*e

to No. 1 CAN Junction Connector

*f

to Rack and Pinion Power Steering Gear Assembly

*g

to ECM

-

-

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

Connected to

G104-1 (CANH) - G104-7 (CANL)

Cable disconnected from negative (-) auxiliary battery terminal

200 Ω or higher

Brake booster with master cylinder assembly (skid control ECU)

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

Cable disconnected from negative (-) auxiliary battery terminal

108 to 132 Ω

Airbag ECU assembly

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

Cable disconnected from negative (-) auxiliary battery terminal

200 Ω or higher

Hybrid vehicle control ECU assembly

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

Cable disconnected from negative (-) auxiliary battery terminal

108 to 132 Ω

No. 1 CAN junction connector

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

Cable disconnected from negative (-) auxiliary battery terminal

200 Ω or higher

Rack and pinion power steering gear assembly

G104-6 (CANH) - G104-12 (CANL)

Cable disconnected from negative (-) auxiliary battery terminal

200 Ω or higher

ECM

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 (-) auxiliary battery terminal

108 to 132 Ω
OK

REPLACE CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU) 2019 MY RAV4 RAV4 HV [02/2019 - 10/2019]; NETWORKING: NETWORK GATEWAY ECU: REMOVAL 2020 MY RAV4 RAV4 HV [10/2019 - 08/2020]; 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)

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.

w/ Occupant Classification System: Click here 2019 - 2020 MY RAV4 RAV4 HV [02/2019 - 08/2020]; SUPPLEMENTAL RESTRAINT SYSTEMS: AIRBAG SYSTEM (w/ Occupant Classification System): PRECAUTION

w/o Occupant Classification System: Click here 2019 - 2020 MY RAV4 RAV4 HV [11/2018 - 08/2020]; SUPPLEMENTAL RESTRAINT SYSTEMS: AIRBAG SYSTEM (w/o Occupant Classification 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 (-) auxiliary battery terminal

108 to 132 Ω
OK

REPLACE AIRBAG ECU ASSEMBLY 2019 MY RAV4 RAV4 HV [02/2019 - 10/2019]; SUPPLEMENTAL RESTRAINT SYSTEMS: CENTER AIRBAG SENSOR ASSEMBLY: REMOVAL 2020 MY RAV4 RAV4 HV [10/2019 - 08/2020]; SUPPLEMENTAL RESTRAINT SYSTEMS: CENTER AIRBAG SENSOR ASSEMBLY: REMOVAL

NG

REPLACE CAN MAIN WIRE AND 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 2019 MY RAV4 HV [02/2019 - 10/2019]; NETWORKING: CAN COMMUNICATION SYSTEM (for HV Model): TERMINALS OF ECU 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

(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 (-) auxiliary 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.

*a

Component with harness connected

(Central Gateway ECU [Network Gateway ECU])
OK

REPLACE ECU OR SENSOR
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR