Last Modified: 01-30-2024 6.11:8.1.0 Doc ID: RM1000000021HLC
Model Year Start: 2022 Model: RAV4 Prod Date Range: [12/2021 - 10/2022]
Title: NETWORKING: CAN COMMUNICATION SYSTEM (for Gasoline Model): Check Bus 1 Line for Short to GND; 2022 MY RAV4 [12/2021 - 10/2022]

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/ Parking Assist Monitor System

*2: w/ Blind Spot Monitor System

*3: w/ Panoramic View Monitor System

*4: w/ Intuitive Parking Assist System

*5: w/ Garage Door Opener System (for Digital Inner Mirror Type)

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
  • Millimeter wave radar sensor assembly
  • Blind spot monitor sensor LH*2
  • Parking assist ECU*3
  • Television camera assembly*1, *3
  • Clearance warning ECU assembly*4
  • Inner rear view mirror 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 2022 MY RAV4 RAV4 HV [12/2021 - 10/2022]; 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 2022 MY RAV4 [12/2021 - 10/2022]; 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

*c

to No. 8 CAN Junction Connector

*d

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

*e

to Forward Recognition Camera

*f

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

*g

to Central Gateway ECU (Network Gateway ECU)

*h

to Inner Rear View Mirror Assembly (w/ Garage Door Opener System [for Digital Inner Mirror Type])

*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/ Intuitive Parking Assist System

*2: w/ Panoramic View Monitor System

*3: w/ Garage Door Opener System (for Digital Inner Mirror Type)

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

Cable disconnected from negative (-) battery terminal

200 Ω or higher

Millimeter wave radar sensor assembly

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)

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

Cable disconnected from negative (-) battery terminal

200 Ω or higher

Parking assist ECU*2

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

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*1

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)

G102-10 (CANH) - G114-4 (CG)

Cable disconnected from negative (-) battery terminal

200 Ω or higher

Inner rear view mirror assembly*3

G102-20 (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 (Wire to ECU or sensor)

D
A

REPLACE NO. 2 CAN JUNCTION CONNECTOR
C

GO TO STEP 3

D

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)

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

N75-1 (CANH) - G114-4 (CG)

Cable disconnected from negative (-) battery terminal

200 Ω or higher

No. 2 CAN junction connector

N75-12 (CANL) - G114-4 (CG)

N75-2 (CANH) - G114-4 (CG)

Cable disconnected from negative (-) battery terminal

200 Ω or higher

Blind spot monitor sensor LH*1

N75-13 (CANL) - G114-4 (CG)

N75-3 (CANH) - G114-4 (CG)

Cable disconnected from negative (-) battery terminal

200 Ω or higher

Television camera assembly*2, *3

N75-14 (CANL) - G114-4 (CG)

N75-4 (CANH) - G114-4 (CG)

Cable disconnected from negative (-) battery terminal

200 Ω or higher

No. 1 CAN junction terminal

N75-15 (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 2022 MY RAV4 [12/2021 - 10/2022]; 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