Last Modified: 01-30-2024 6.11:8.1.0 Doc ID: RM100000001FYRT
Model Year Start: 2019 Model: RAV4 Prod Date Range: [11/2018 - 12/2021]
Title: NETWORKING: CAN COMMUNICATION SYSTEM (for Gasoline Model): Check Bus 5 Line for Short to GND; 2019 - 2021 MY RAV4 [11/2018 - 12/2021]

Check Bus 5 Line for Short to GND

DESCRIPTION

There may be a short circuit between one of the CAN bus wire and GND when there is no resistance between terminal 15 (CA5H) of the central gateway ECU (network gateway ECU) and terminal 4 (CG) of the DLC3, or terminal 16 (CA5L) of the central gateway ECU (network gateway ECU) and terminal 4 (CG) of the DLC3.

Symptom

Trouble Area

*1: w/ Headlight ECU

*2: w/ Memory

*3: w/ Smart Key System

*4: w/ Power Back Door System

*5: w/ Power Back Door System, Memory or Headlight ECU

There is no resistance between terminal 15 (CA5H) of the central gateway ECU (network gateway ECU) and terminal 4 (CG) of the DLC3, or terminal 16 (CA5L) 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)
  • Headlight ECU sub-assembly LH*1
  • Headlight ECU sub-assembly RH*1
  • Position control ECU assembly*2
  • Main body ECU (multiplex network body ECU)
  • Certification ECU (smart key ECU assembly)*3
  • Air conditioning amplifier assembly
  • Multiplex network door ECU*4
  • Combination meter assembly
  • No. 1 CAN junction connector
  • No. 5 CAN junction connector*1
  • No. 7 CAN junction connector*5

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 2021 MY RAV4 RAV4 HV [08/2020 - 12/2021]; 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 2021 MY RAV4 [08/2020 - 12/2021]; NETWORKING: CAN COMMUNICATION SYSTEM (for Gasoline Model): DIAGNOSIS SYSTEM

  • When replacing the combination meter assembly, always replace it with a new one. If a combination meter assembly which was installed to another vehicle is used, the information stored in it will not match the information from the vehicle and a DTC may be stored.

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 GND 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. 7 CAN Junction Connector (w/ Power Back Door System, Memory and Headlight ECU)
  • to Combination Meter Assembly (w/o Power Back Door System, Memory or Headlight ECU)

*c

to Certification ECU (Smart Key ECU Assembly) (w/ Smart Key System)

*d

  • to No. 5 CAN Junction Connector (w/ Headlight ECU)
  • to Central Gateway ECU (Network Gateway ECU) (w/o Headlight ECU)

*e

to Main Body ECU (Multiplex Network Body ECU)

*f

to Air Conditioning Amplifier 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

*1: w/o Power Back Door System, Memory and Headlight ECU

*2: w/ Power Back Door System, Memory or Headlight ECU

*3: w/ Smart Key System

*4: w/ Headlight ECU

*5: w/o Headlight ECU

G96-1 (CANH) - G114-4 (CG)

Cable disconnected from negative (-) battery terminal

200 Ω or higher

  • No. 7 CAN junction connector*2
  • Combination meter assembly*1

G96-12 (CANL) - G114-4 (CG)

G96-2 (CANH) - G114-4 (CG)

Cable disconnected from negative (-) battery terminal

200 Ω or higher

Certification ECU (smart key ECU assembly)*3

G96-13 (CANL) - G114-4 (CG)

G96-3 (CANH) - G114-4 (CG)

Cable disconnected from negative (-) battery terminal

200 Ω or higher

  • No. 5 CAN junction connector*4
  • Central gateway ECU (network gateway ECU)*5

G96-14 (CANL) - G114-4 (CG)

G96-4 (CANH) - G114-4 (CG)

Cable disconnected from negative (-) battery terminal

200 Ω or higher

Main body ECU (multiplex network body ECU)

G96-15 (CANL) - G114-4 (CG)

G96-5 (CANH) - G114-4 (CG)

Cable disconnected from negative (-) battery terminal

200 Ω or higher

Air conditioning amplifier assembly

G96-16 (CANL) - G114-4 (CG)

Result

Proceed to

OK

A

NG (Central gateway ECU [network gateway ECU] CAN main wire) (w/o Headlight ECU)

B

NG (No. 5 CAN junction connector CAN main wire) (w/ Headlight ECU)

C

NG (No. 7 CAN junction connector CAN main wire) (w/ Power Back Door System, Memory or Headlight ECU)

D

NG (Wire to ECU or sensor)

E

A

REPLACE NO. 1 CAN JUNCTION CONNECTOR

C

GO TO STEP 3

D

GO TO STEP 5

E

GO TO STEP 6

B

2.

CHECK FOR SHORT TO GND IN CAN BUS WIRE (CENTRAL GATEWAY ECU [NETWORK GATEWAY ECU] - NO. 1 CAN JUNCTION CONNECTOR)

(a) Reconnect the G96 No. 1 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

G72-15 (CA5H) - G114-4 (CG)

Cable disconnected from negative (-) battery terminal

200 Ω or higher

G72-16 (CA5L) - 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 2021 MY RAV4 RAV4 HV [08/2020 - 12/2021]; NETWORKING: NETWORK GATEWAY ECU: REMOVAL

NG

REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (CENTRAL GATEWAY ECU [NETWORK GATEWAY ECU] - NO. 1 CAN JUNCTION CONNECTOR)

3.

CHECK FOR SHORT TO GND IN CAN BUS WIRE (NO. 5 CAN JUNCTION CONNECTOR)

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

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

*a

Front view of wire harness connector

(to No. 5 CAN Junction Connector)

*b

to No. 1 CAN Junction Connector

*c

to Headlight ECU Sub-assembly RH

*d

to Central Gateway ECU (Network Gateway ECU)

*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

G105-9 (CANH) - G114-4 (CG)

Cable disconnected from negative (-) battery terminal

200 Ω or higher

No. 1 CAN junction connector

G105-20 (CANL) - G114-4 (CG)

G105-10 (CANH) - G114-4 (CG)

Cable disconnected from negative (-) battery terminal

200 Ω or higher

Headlight ECU sub-assembly RH

G105-21 (CANL) - G114-4 (CG)

G105-11 (CANH) - G114-4 (CG)

Cable disconnected from negative (-) battery terminal

200 Ω or higher

Central gateway ECU (network gateway ECU)

G105-22 (CANL) - G114-4 (CG)

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. 5 CAN JUNCTION CONNECTOR

C

REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (NO. 5 CAN JUNCTION CONNECTOR - NO. 1 CAN JUNCTION CONNECTOR)

D

GO TO STEP 6

B

4.

CHECK FOR SHORT TO GND 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

G72-15 (CA5H) - G114-4 (CG)

Cable disconnected from negative (-) battery terminal

200 Ω or higher

G72-16 (CA5L) - 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 2021 MY RAV4 RAV4 HV [08/2020 - 12/2021]; 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)

5.

CHECK FOR SHORT TO GND IN CAN BUS WIRE (NO. 7 CAN JUNCTION CONNECTOR)

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

(b) Disconnect the No. 7 CAN junction connector.

*a

Front view of wire harness connector

(to No. 7 CAN Junction Connector)

*b

to No. 1 CAN Junction Connector

*c

to Combination Meter Assembly

*d

to Multiplex Network Door ECU (w/ Power Back Door System)

*e

to Position Control ECU Assembly (w/ Memory)

*f

to Headlight ECU Sub-assembly LH (w/ Headlight ECU)

*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/ Power Back Door System

*2: w/ Memory

*3: w/ Headlight ECU

N52-1 (CANH) - G114-4 (CG)

Cable disconnected from negative (-) battery terminal

200 Ω or higher

No. 1 CAN junction connector

N52-7 (CANL) - G114-4 (CG)

N52-2 (CANH) - G114-4 (CG)

Cable disconnected from negative (-) battery terminal

200 Ω or higher

Combination meter assembly

N52-8 (CANL) - G114-4 (CG)

N52-3 (CANH) - G114-4 (CG)

Cable disconnected from negative (-) battery terminal

200 Ω or higher

Multiplex network door ECU*1

N52-9 (CANL) - G114-4 (CG)

N52-4 (CANH) - G114-4 (CG)

Cable disconnected from negative (-) battery terminal

200 Ω or higher

Position control ECU assembly*2

N52-10 (CANL) - G114-4 (CG)

N52-5 (CANH) - G114-4 (CG)

Cable disconnected from negative (-) battery terminal

200 Ω or higher

Headlight ECU sub-assembly LH*3

N52-11 (CANL) - G114-4 (CG)

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. 7 CAN JUNCTION CONNECTOR

B

REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (NO. 7 CAN JUNCTION CONNECTOR - NO. 1 CAN JUNCTION CONNECTOR)

C

GO TO STEP 6

6.

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 wire 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 2021 MY RAV4 [08/2020 - 12/2021]; 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

G72-15 (CA5H) - G114-4 (CG)

Cable disconnected from negative (-) battery terminal

200 Ω or higher

G72-16 (CA5L) - 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.
OK

REPLACE ECU OR SENSOR

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR