Last Modified: 01-30-2024 6.11:8.1.0 Doc ID: RM100000001FYR9
Model Year Start: 2019 Model: RAV4 Prod Date Range: [11/2018 - 08/2020]
Title: NETWORKING: CAN COMMUNICATION SYSTEM (for Gasoline Model): Check Bus 1 Line for Short to GND; 2019 - 2020 MY RAV4 [11/2018 - 08/2020]

Check Bus 1 Line for Short to GND

DESCRIPTION

There may be a short circuit between one of the CAN bus wires and GND when there is no resistance between terminal 23 (CA1H) of the central gateway ECU (network gateway ECU) and terminal 4 (CG) of the DLC3, or terminal 8 (CA1L) of the central gateway ECU (network gateway ECU) and terminal 4 (CG) of the DLC3.

Symptom

Trouble Area
*1: w/ Pre-collision System

*2: w/ Blind Spot Monitor System

*3: w/ Panoramic View Monitor System

*4: w/ Intuitive Parking Assist System

*5: w/ Grille Shutter System

*6: w/ Parking Assist Monitor System

There is no resistance between terminal 23 (CA1H) of the central gateway ECU (network gateway ECU) and terminal 4 (CG) of the DLC3, or terminal 8 (CA1L) of the central gateway ECU (network gateway ECU) and terminal 4 (CG) of the DLC3.
  • Short to GND in CAN main bus wire
  • Short to GND in CAN branch wire
  • Central gateway ECU (network gateway ECU)
  • Forward recognition camera*1
  • Millimeter wave radar sensor assembly*1
  • Blind spot monitor sensor LH*2
  • Parking assist ECU*3
  • Television camera assembly*3, *6
  • Clearance warning ECU assembly*4
  • Swing grille actuator assembly*5
  • Radiator shutter sub-assembly*5
  • No. 2 CAN junction connector
  • No. 8 CAN junction connector
  • No. 1 CAN junction terminal

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 2019 MY RAV4 RAV4 HV [11/2018 - 02/2019]; INTRODUCTION: REPAIR INSTRUCTION: INITIALIZATION 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 [11/2018 - 02/2019]; NETWORKING: CAN COMMUNICATION SYSTEM (for Gasoline Model): DIAGNOSIS SYSTEM 2019 MY RAV4 [02/2019 - 10/2019]; NETWORKING: CAN COMMUNICATION SYSTEM (for Gasoline Model): DIAGNOSIS SYSTEM 2020 MY RAV4 [10/2019 - 08/2020]; 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 TO GND IN CAN BUS WIRE (NO. 2 CAN JUNCTION CONNECTOR)

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

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

*a

Front view of wire harness connector

(to No. 2 CAN Junction Connector)

*b

to Millimeter Wave Radar Sensor Assembly (w/ Pre-collision System)

*c

to No. 8 CAN Junction Connector

*d

to Swing Grille Actuator Assembly (w/ Grille Shutter System)

*e

to Parking Assist ECU (w/ Panoramic View Monitor System)

*f

to Forward Recognition Camera (w/ Pre-collision System)

*g

to Clearance Warning ECU Assembly (w/ Intuitive Parking Assist System)

*h

to Central Gateway ECU (Network Gateway ECU)

*i

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/ Pre-collision System

*2: w/ Intuitive Parking Assist System

*3: w/ Panoramic View Monitor System

*4: w/ Grille Shutter System

G102-2 (CANH) - G114-4 (CG)

Cable disconnected from negative (-) battery terminal

200 Ω or higher

Millimeter wave radar sensor assembly*1

G102-12 (CANL) - G114-4 (CG)

G102-3 (CANH) - G114-4 (CG)

Cable disconnected from negative (-) battery terminal

200 Ω or higher

No. 8 CAN junction connector

G102-13 (CANL) - G114-4 (CG)

G102-4 (CANH) - G114-4 (CG)

Cable disconnected from negative (-) battery terminal

200 Ω or higher

Swing grille actuator assembly*4

G102-14 (CANL) - G114-4 (CG)

G102-5 (CANH) - G114-4 (CG)

Cable disconnected from negative (-) battery terminal

200 Ω or higher

Parking assist ECU*3

G102-15 (CANL) - G114-4 (CG)

G102-6 (CANH) - G114-4 (CG)

Cable disconnected from negative (-) battery terminal

200 Ω or higher

Forward recognition camera*1

G102-16 (CANL) - G114-4 (CG)

G102-7 (CANH) - G114-4 (CG)

Cable disconnected from negative (-) battery terminal

200 Ω or higher

Clearance warning ECU assembly*2

G102-17 (CANL) - G114-4 (CG)

G102-8 (CANH) - G114-4 (CG)

Cable disconnected from negative (-) battery terminal

200 Ω or higher

Central gateway ECU (network gateway ECU)

G102-18 (CANL) - G114-4 (CG)

Result

Proceed to

OK

A

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

B

NG (No. 8 CAN junction connector CAN main wire)

C

NG (Swing grille actuator assembly CAN branch wire)

D

NG (Wire to ECU or sensor)

E
A

REPLACE NO. 2 CAN JUNCTION CONNECTOR
C

GO TO STEP 3

D

GO TO STEP 5

E

GO TO STEP 4

B

2.

CHECK FOR SHORT TO GND IN CAN BUS WIRE (CENTRAL GATEWAY ECU [NETWORK GATEWAY ECU] - NO. 2 CAN JUNCTION CONNECTOR)

(a) Reconnect the G102 No. 2 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

G72-23 (CA1H) - G114-4 (CG)

Cable disconnected from negative (-) battery terminal

200 Ω or higher

G72-8 (CA1L) - G114-4 (CG)
OK

REPLACE CENTRAL GATEWAY ECU (NETWORK GATEWAY ECU) 2019 MY RAV4 RAV4 HV [11/2018 - 02/2019]; NETWORKING: NETWORK GATEWAY ECU: REMOVAL 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. 2 CAN JUNCTION CONNECTOR)

3.

CHECK FOR SHORT TO GND IN CAN BUS WIRE (NO. 8 CAN JUNCTION CONNECTOR)

(a) Reconnect the G102 No. 2 CAN junction connector.

(b) Disconnect the No. 8 CAN junction connector.

*a

Front view of wire harness connector

(to No. 8 CAN Junction Connector)

*b

to No. 2 CAN Junction Connector

*c

to Blind Spot Monitor Sensor LH (w/ Blind Spot Monitor System)

*d

to Television Camera Assembly (w/ Panoramic View Monitor System, w/ Parking Assist Monitor System)

*e

to No. 1 CAN Junction Terminal

*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
*1: w/ Blind Spot Monitor System

*2: w/ Panoramic View Monitor System

*3: w/ Parking Assist Monitor System

N53-1 (CANH) - G114-4 (CG)

Cable disconnected from negative (-) battery terminal

200 Ω or higher

No. 2 CAN junction connector

N53-7 (CANL) - G114-4 (CG)

N53-2 (CANH) - G114-4 (CG)

Cable disconnected from negative (-) battery terminal

200 Ω or higher

Blind spot monitor sensor LH*1

N53-8 (CANL) - G114-4 (CG)

N53-3 (CANH) - G114-4 (CG)

Cable disconnected from negative (-) battery terminal

200 Ω or higher

Television camera assembly*2, *3

N53-9 (CANL) - G114-4 (CG)

N53-4 (CANH) - G114-4 (CG)

Cable disconnected from negative (-) battery terminal

200 Ω or higher

No. 1 CAN junction terminal

N53-10 (CANL) - G114-4 (CG)

Result

Proceed to

OK

A

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

B

NG (Wire to ECU or sensor)

C
A

REPLACE NO. 8 CAN JUNCTION CONNECTOR
B

REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (NO. 8 CAN JUNCTION CONNECTOR - NO. 2 CAN JUNCTION CONNECTOR)
C

4.

CHECK FOR SHORT TO GND 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 line shorted to GND is connected.

Click here 2019 MY RAV4 [11/2018 - 02/2019]; NETWORKING: CAN COMMUNICATION SYSTEM (for Gasoline Model): TERMINALS OF ECU 2019 MY RAV4 [02/2019 - 10/2019]; NETWORKING: CAN COMMUNICATION SYSTEM (for Gasoline Model): TERMINALS OF ECU 2020 MY RAV4 [10/2019 - 08/2020]; NETWORKING: CAN COMMUNICATION SYSTEM (for Gasoline Model): TERMINALS OF ECU

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

G72-23 (CA1H) - G114-4 (CG)

Cable disconnected from negative (-) battery terminal

200 Ω or higher

G72-8 (CA1L) - G114-4 (CG)

HINT:

  • If the resistance changes to 200 Ω 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 GND 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])

*b

Front view of DLC3
OK

REPLACE ECU OR SENSOR
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

5.

CHECK FOR SHORT TO GND IN CAN BUS WIRE (SWING GRILLE ACTUATOR ASSEMBLY BRANCH WIRE)

(a) Reconnect the G102 No. 2 CAN junction connector.

(b) Disconnect the swing grille actuator assembly connector.

*a

Front view of wire harness connector

(to Swing Grille Actuator Assembly)

*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

A-6 (CANP) - G114-4 (CG)

Cable disconnected from negative (-) battery terminal

200 Ω or higher

A-5 (CANN) - G114-4 (CG)
OK

REPLACE SWING GRILLE ACTUATOR ASSEMBLY

NG

6.

CHECK FOR SHORT TO GND IN CAN BUS WIRE (RADIATOR SHUTTER SUB-ASSEMBLY BRANCH WIRE)

(a) Reconnect the swing grille actuator assembly connector.

(b) Disconnect the radiator shutter sub-assembly connector.

*a

Front view of wire harness connector

(to Radiator Shutter Sub-assembly)

*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

A50-2 (CANP) - G114-4 (CG)

Cable disconnected from negative (-) battery terminal

200 Ω or higher

A50-3 (CANN) - G114-4 (CG)
OK

REPLACE RADIATOR SHUTTER SUB-ASSEMBLY 2019 MY RAV4 RAV4 HV [11/2018 - 02/2019]; EXTERIOR PANELS / TRIM: GRILLE SHUTTER: REMOVAL 2019 - 2021 MY RAV4 RAV4 HV [02/2019 - 12/2021]; EXTERIOR PANELS / TRIM: GRILLE SHUTTER: REMOVAL

NG

REPAIR OR REPLACE CAN BRANCH WIRE OR CONNECTOR (RADIATOR SHUTTER SUB-ASSEMBLY - NO. 2 CAN JUNCTION CONNECTOR)