Lexus RX (RX 350L, RX450h) 2016-2024 Repair Manual: Check Bus 4 Line for Short to +B

DESCRIPTION

There may be a short circuit between one of the CAN bus lines and +B when there is no resistance between terminal 22 (CA2H) of the network gateway ECU and terminal 16 (BAT) of the DLC3, or terminal 7 (CA2L) of the network gateway ECU and terminal 16 (BAT) of the DLC3.

Symptom

Trouble Area

There is no resistance between terminal 22 (CA2H) of the network gateway ECU and terminal 16 (BAT) of the DLC3, or terminal 7 (CA2L) of the network gateway ECU and terminal 16 (BAT) of the DLC3.

  • Short in CAN main bus line
  • Short in CAN branch line
  • Skid control ECU (brake actuator assembly)
  • 4WD ECU assembly (for AWD)
  • Tire pressure warning ECU and receiver
  • Absorber control ECU (w/ AVS)
  • Power steering ECU assembly
  • Steering sensor
  • Yaw rate sensor assembly (w/ TFT Meter Type Combination Meter Assembly)
  • Airbag sensor assembly
  • Occupant detection ECU
  • Network gateway ECU
  • No. 1 CAN junction connector
  • No. 7 CAN junction connector
  • No. 8 CAN junction connector
  • No. 9 CAN junction connector
  • No. 12 CAN junction connector

WIRING DIAGRAM

CAUTION / NOTICE / HINT

CAUTION:

When performing the confirmation driving pattern, obey all speed limits and traffic laws.

NOTICE:

  • Before measuring the resistance of the CAN bus, turn the engine 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 engine 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

  • 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

  • After performing repairs, perform the DTC check procedure and confirm that the DTCs are not output again.

    DTC check procedure: Turn the engine switch on (IG) 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.

    Click here

HINT:

  • Operating the engine switch, any other switches or a door triggers related ECU and sensor communication on the CAN. This communication will cause the resistance value to change.
  • 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 +B IN CAN BUS LINE (NETWORK GATEWAY ECU)

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

(b) Disconnect the J75 network gateway ECU connector.

*1

DLC3

-

-

*a

Front view of wire harness connector

(to Network Gateway ECU)

-

-

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

J75-22 (CA2H) - J141-16 (BAT)

Cable disconnected from negative (-) battery terminal

6 kΩ or higher

J75-7 (CA2L) - J141-16 (BAT)

Result

Proceed to

OK

A

NG (w/o Rear No. 2 Seat)

B

NG (w/ Rear No. 2 Seat)

C

A

REPLACE NETWORK GATEWAY ECU

C

GO TO STEP 7

B

2.

CHECK FOR SHORT TO +B IN CAN BUS LINE (NO. 9 CAN JUNCTION CONNECTOR)

(a) Reconnect the J75 network gateway ECU connector.

(b) Disconnect the R40 No. 9 CAN junction connector.

*1

DLC3

-

-

*a

Front view of wire harness connector

(to No. 9 CAN Junction Connector)

*b

to No. 12 CAN Junction Connector

*c

to Tire Pressure Warning ECU and Receiver

*d

to No. 8 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

R40-9 (CANH) - J141-16 (BAT)

Cable disconnected from negative (-) battery terminal

6 kΩ or higher

No. 12 CAN junction connector

R40-20 (CANL) - J141-16 (BAT)

R40-10 (CANH) - J141-16 (BAT)

Cable disconnected from negative (-) battery terminal

6 kΩ or higher

Tire pressure warning ECU and receiver

R40-21 (CANL) - J141-16 (BAT)

R40-11 (CANH) - J141-16 (BAT)

Cable disconnected from negative (-) battery terminal

6 kΩ or higher

No. 8 CAN junction connector

R40-22 (CANL) - J141-16 (BAT)

Result

Proceed to

OK

A

NG (No. 8 CAN junction connector main line)

B

NG (ECU or sensor bus line)

C

NG (No. 12 CAN junction connector main line)

D

A

REPLACE NO. 9 CAN JUNCTION CONNECTOR

C

GO TO STEP 12

D

GO TO STEP 5

B

3.

CHECK FOR SHORT TO +B IN CAN BUS LINE (NO. 1 CAN JUNCTION CONNECTOR)

(a) Reconnect the R40 No. 9 CAN junction connector.

(b) Disconnect the A86 No. 1 CAN junction connector.

*1

DLC3

-

-

*a

Front view of wire harness connector

(to No. 1 CAN Junction Connector)

*b

to No. 8 CAN Junction Connector

*c

to Network Gateway ECU

*d

to Skid Control ECU (Brake Actuator Assembly)

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

Connected to

A86-8 (CANH) - J141-16 (BAT)

Cable disconnected from negative (-) battery terminal

6 kΩ or higher

No. 8 CAN junction connector

A86-19 (CANL) - J141-16 (BAT)

A86-9 (CANH) - J141-16 (BAT)

Cable disconnected from negative (-) battery terminal

6 kΩ or higher

Network gateway ECU

A86-20 (CANL) - J141-16 (BAT)

A86-10 (CANH) - J141-16 (BAT)

Cable disconnected from negative (-) battery terminal

6 kΩ or higher

Skid control ECU (brake actuator assembly)

A86-21 (CANL) - J141-16 (BAT)

Result

Proceed to

OK

A

NG (Network gateway ECU main line)

B

NG (ECU or sensor bus line)

C

NG (No. 8 CAN junction connector main line)

D

A

REPLACE NO. 1 CAN JUNCTION CONNECTOR

B

REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (NETWORK GATEWAY ECU - NO. 1 CAN JUNCTION CONNECTOR)

C

GO TO STEP 12

D

4.

CHECK FOR SHORT TO +B IN CAN BUS LINE (NO. 8 CAN JUNCTION CONNECTOR)

(a) Reconnect the A86 No. 1 CAN junction connector.

(b) Disconnect the R37 No. 8 CAN junction connector.

*1

DLC3

-

-

*a

Front view of wire harness connector

(to No. 8 CAN Junction Connector)

*b

to No. 9 CAN Junction Connector

*c

to No. 1 CAN Junction Connector

*d

to Occupant Detection ECU

*e

to 4WD ECU Assembly

(for AWD)

-

-

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

Connected to

*: for AWD

R37-1 (CANH) - J141-16 (BAT)

Cable disconnected from negative (-) battery terminal

6 kΩ or higher

No. 9 CAN junction connector

R37-12 (CANL) - J141-16 (BAT)

R37-2 (CANH) - J141-16 (BAT)

Cable disconnected from negative (-) battery terminal

6 kΩ or higher

No. 1 CAN junction connector

R37-13 (CANL) - J141-16 (BAT)

R37-3 (CANH) - J141-16 (BAT)

Cable disconnected from negative (-) battery terminal

6 kΩ or higher

Occupant detection ECU

R37-14 (CANL) - J141-16 (BAT)

R37-4 (CANH) - J141-16 (BAT)

Cable disconnected from negative (-) battery terminal

6 kΩ or higher

4WD ECU assembly*

R37-15 (CANL) - J141-16 (BAT)

Result

Proceed to

OK

A

NG (No. 1 CAN junction connector main line)

B

NG (ECU or sensor bus line)

C

NG (No. 9 CAN junction connector main line)

D

A

REPLACE NO. 8 CAN JUNCTION CONNECTOR

B

REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (NO. 1 CAN JUNCTION CONNECTOR - NO. 8 CAN JUNCTION CONNECTOR)

C

GO TO STEP 12

D

REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (NO. 8 CAN JUNCTION CONNECTOR - NO. 9 CAN JUNCTION CONNECTOR)

5.

CHECK FOR SHORT TO +B IN CAN BUS LINE (NO. 12 CAN JUNCTION CONNECTOR)

(a) Reconnect the R40 No. 9 CAN junction connector.

(b) Disconnect the S63 No. 12 CAN junction connector.

*1

DLC3

-

-

*a

Front view of wire harness connector

(to No. 12 CAN Junction Connector)

*b

to No. 7 CAN Junction Connector

*c

to No. 9 CAN Junction Connector

*d

to Absorber Control ECU

(w/ AVS)

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

Connected to

*: w/ AVS

S63-8 (CANH) - J141-16 (BAT)

Cable disconnected from negative (-) battery terminal

6 kΩ or higher

No. 7 CAN junction connector

S63-19 (CANL) - J141-16 (BAT)

S63-9 (CANH) - J141-16 (BAT)

Cable disconnected from negative (-) battery terminal

6 kΩ or higher

No. 9 CAN junction connector

S63-20 (CANL) - J141-16 (BAT)

S63-11 (CANH) - J141-16 (BAT)

Cable disconnected from negative (-) battery terminal

6 kΩ or higher

Absorber control ECU*

S63-22 (CANL) - J141-16 (BAT)

Result

Proceed to

OK

A

NG (No. 9 CAN junction connector main line)

B

NG (ECU or sensor bus line)

C

NG (No. 7 CAN junction connector main line)

D

A

REPLACE NO. 12 CAN JUNCTION CONNECTOR

B

REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (NO. 9 CAN JUNCTION CONNECTOR - NO. 12 CAN JUNCTION CONNECTOR)

C

GO TO STEP 12

D

6.

CHECK FOR SHORT TO +B IN CAN BUS LINE (NO. 7 CAN JUNCTION CONNECTOR)

(a) Reconnect the S63 No. 12 CAN junction connector.

(b) Disconnect the J99 No. 7 CAN junction connector.

*1

DLC3

-

-

*a

Front view of wire harness connector

(to No. 7 CAN Junction Connector)

*b

to Airbag Sensor Assembly

*c

to Steering Sensor

*d

to Yaw Rate Sensor Assembly

(w/ TFT Meter Type Combination Meter Assembly)

*e

to Power Steering ECU Assembly

*f

to No. 12 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/ TFT Meter Type Combination Meter Assembly

J99-1 (CANH) - J141-16 (BAT)

Cable disconnected from negative (-) battery terminal

6 kΩ or higher

Airbag sensor assembly

J99-12 (CANL) - J141-16 (BAT)

J99-2 (CANH) - J141-16 (BAT)

Cable disconnected from negative (-) battery terminal

6 kΩ or higher

Steering sensor

J99-13 (CANL) - J141-16 (BAT)

J99-3 (CANH) - J141-16 (BAT)

Cable disconnected from negative (-) battery terminal

6 kΩ or higher

Yaw rate sensor assembly*

J99-14 (CANL) - J141-16 (BAT)

J99-4 (CANH) - J141-16 (BAT)

Cable disconnected from negative (-) battery terminal

6 kΩ or higher

Power steering ECU assembly

J99-15 (CANL) - J141-16 (BAT)

J99-6 (CANH) - J141-16 (BAT)

Cable disconnected from negative (-) battery terminal

6 kΩ or higher

No. 12 CAN junction connector

J99-17 (CANL) - J141-16 (BAT)

Result

Proceed to

OK

A

NG (No. 12 CAN junction connector main line)

B

NG (ECU or sensor bus line)

C

A

REPLACE NO. 7 CAN JUNCTION CONNECTOR

B

REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (NO. 7 CAN JUNCTION CONNECTOR - NO. 12 CAN JUNCTION CONNECTOR)

C

GO TO STEP 12

7.

CHECK FOR SHORT TO +B IN CAN BUS LINE (NO. 9 CAN JUNCTION CONNECTOR)

(a) Reconnect the J75 network gateway ECU connector.

(b) Disconnect the R56 No. 9 CAN junction connector.

*1

DLC3

-

-

*a

Front view of wire harness connector

(to No. 9 CAN Junction Connector)

*b

to No. 12 CAN Junction Connector

*c

to Tire Pressure Warning ECU and Receiver

*d

to No. 8 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

R56-9 (CANH) - J141-16 (BAT)

Cable disconnected from negative (-) battery terminal

6 kΩ or higher

No. 12 CAN junction connector

R56-20 (CANL) - J141-16 (BAT)

R56-10 (CANH) - J141-16 (BAT)

Cable disconnected from negative (-) battery terminal

6 kΩ or higher

Tire pressure warning ECU and receiver

R56-21 (CANL) - J141-16 (BAT)

R56-11 (CANH) - J141-16 (BAT)

Cable disconnected from negative (-) battery terminal

6 kΩ or higher

No. 8 CAN junction connector

R56-22 (CANL) - J141-16 (BAT)

Result

Proceed to

OK

A

NG (No. 8 CAN junction connector main line)

B

NG (ECU or sensor bus line)

C

NG (No. 12 CAN junction connector main line)

D

A

REPLACE NO. 9 CAN JUNCTION CONNECTOR

C

GO TO STEP 12

D

GO TO STEP 10

B

8.

CHECK FOR SHORT TO +B IN CAN BUS LINE (NO. 1 CAN JUNCTION CONNECTOR)

(a) Reconnect the R56 No. 9 CAN junction connector.

(b) Disconnect the A86 No. 1 CAN junction connector.

*1

DLC3

-

-

*a

Front view of wire harness connector

(to No. 1 CAN Junction Connector)

*b

to No. 8 CAN Junction Connector

*c

to Network Gateway ECU

*d

to Skid Control ECU (Brake Actuator Assembly)

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

Connected to

A86-8 (CANH) - J141-16 (BAT)

Cable disconnected from negative (-) battery terminal

6 kΩ or higher

No. 8 CAN junction connector

A86-19 (CANL) - J141-16 (BAT)

A86-9 (CANH) - J141-16 (BAT)

Cable disconnected from negative (-) battery terminal

6 kΩ or higher

Network gateway ECU

A86-20 (CANL) - J141-16 (BAT)

A86-10 (CANH) - J141-16 (BAT)

Cable disconnected from negative (-) battery terminal

6 kΩ or higher

Skid control ECU (brake actuator assembly)

A86-21 (CANL) - J141-16 (BAT)

Result

Proceed to

OK

A

NG (Network gateway ECU main line)

B

NG (ECU or sensor bus line)

C

NG (No. 8 CAN junction connector main line)

D

A

REPLACE NO. 1 CAN JUNCTION CONNECTOR

B

REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (NETWORK GATEWAY ECU - NO. 1 CAN JUNCTION CONNECTOR)

C

GO TO STEP 12

D

9.

CHECK FOR SHORT TO +B IN CAN BUS LINE (NO. 8 CAN JUNCTION CONNECTOR)

(a) Reconnect the A86 No. 1 CAN junction connector.

(b) Disconnect the R55 No. 8 CAN junction connector.

*1

DLC3

-

-

*a

Front view of wire harness connector

(to No. 8 CAN Junction Connector)

*b

to No. 9 CAN Junction Connector

*c

to No. 1 CAN Junction Connector

*d

to Occupant Detection ECU

*e

to 4WD ECU Assembly

(for AWD)

-

-

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

Connected to

*: for AWD

R55-1 (CANH) - J141-16 (BAT)

Cable disconnected from negative (-) battery terminal

6 kΩ or higher

No. 9 CAN junction connector

R55-12 (CANL) - J141-16 (BAT)

R55-2 (CANH) - J141-16 (BAT)

Cable disconnected from negative (-) battery terminal

6 kΩ or higher

No. 1 CAN junction connector

R55-13 (CANL) - J141-16 (BAT)

R55-3 (CANH) - J141-16 (BAT)

Cable disconnected from negative (-) battery terminal

6 kΩ or higher

Occupant detection ECU

R55-14 (CANL) - J141-16 (BAT)

R55-4 (CANH) - J141-16 (BAT)

Cable disconnected from negative (-) battery terminal

6 kΩ or higher

4WD ECU assembly*

R55-15 (CANL) - J141-16 (BAT)

Result

Proceed to

OK

A

NG (No. 1 CAN junction connector main line)

B

NG (ECU or sensor bus line)

C

NG (No. 9 CAN junction connector main line)

D

A

REPLACE NO. 8 CAN JUNCTION CONNECTOR

B

REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (NO. 1 CAN JUNCTION CONNECTOR - NO. 8 CAN JUNCTION CONNECTOR)

C

GO TO STEP 12

D

REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (NO. 8 CAN JUNCTION CONNECTOR - NO. 9 CAN JUNCTION CONNECTOR)

10.

CHECK FOR SHORT TO +B IN CAN BUS LINE (NO. 12 CAN JUNCTION CONNECTOR)

(a) Reconnect the R56 No. 9 CAN junction connector.

(b) Disconnect the S92 No. 12 CAN junction connector.

*1

DLC3

-

-

*a

Front view of wire harness connector

(to No. 12 CAN Junction Connector)

*b

to No. 7 CAN Junction Connector

*c

to No. 9 CAN Junction Connector

*d

to Absorber Control ECU

(w/ AVS)

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

Connected to

*: w/ AVS

S92-8 (CANH) - J141-16 (BAT)

Cable disconnected from negative (-) battery terminal

6 kΩ or higher

No. 7 CAN junction connector

S92-19 (CANL) - J141-16 (BAT)

S92-9 (CANH) - J141-16 (BAT)

Cable disconnected from negative (-) battery terminal

6 kΩ or higher

No. 9 CAN junction connector

S92-20 (CANL) - J141-16 (BAT)

S92-11 (CANH) - J141-16 (BAT)

Cable disconnected from negative (-) battery terminal

6 kΩ or higher

Absorber control ECU*

S92-22 (CANL) - J141-16 (BAT)

Result

Proceed to

OK

A

NG (No. 9 CAN junction connector main line)

B

NG (ECU or sensor bus line)

C

NG (No. 7 CAN junction connector main line)

D

A

REPLACE NO. 12 CAN JUNCTION CONNECTOR

B

REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (NO. 9 CAN JUNCTION CONNECTOR - NO. 12 CAN JUNCTION CONNECTOR)

C

GO TO STEP 12

D

11.

CHECK FOR SHORT TO +B IN CAN BUS LINE (NO. 7 CAN JUNCTION CONNECTOR)

(a) Reconnect the S92 No. 12 CAN junction connector.

(b) Disconnect the J99 No. 7 CAN junction connector.

*1

DLC3

-

-

*a

Front view of wire harness connector

(to No. 7 CAN Junction Connector)

*b

to Airbag Sensor Assembly

*c

to Steering Sensor

*d

to Yaw Rate Sensor Assembly

(w/ TFT Meter Type Combination Meter Assembly)

*e

to Power Steering ECU Assembly

*f

to No. 12 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/ TFT Meter Type Combination Meter Assembly

J99-1 (CANH) - J141-16 (BAT)

Cable disconnected from negative (-) battery terminal

6 kΩ or higher

Airbag sensor assembly

J99-12 (CANL) - J141-16 (BAT)

J99-2 (CANH) - J141-16 (BAT)

Cable disconnected from negative (-) battery terminal

6 kΩ or higher

Steering sensor

J99-13 (CANL) - J141-16 (BAT)

J99-3 (CANH) - J141-16 (BAT)

Cable disconnected from negative (-) battery terminal

6 kΩ or higher

Yaw rate sensor assembly*

J99-14 (CANL) - J141-16 (BAT)

J99-4 (CANH) - J141-16 (BAT)

Cable disconnected from negative (-) battery terminal

6 kΩ or higher

Power steering ECU assembly

J99-15 (CANL) - J141-16 (BAT)

J99-6 (CANH) - J141-16 (BAT)

Cable disconnected from negative (-) battery terminal

6 kΩ or higher

No. 12 CAN junction connector

J99-17 (CANL) - J141-16 (BAT)

Result

Proceed to

OK

A

NG (No. 12 CAN junction connector main line)

B

NG (ECU or sensor bus line)

C

A

REPLACE NO. 7 CAN JUNCTION CONNECTOR

B

REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (NO. 7 CAN JUNCTION CONNECTOR - NO. 12 CAN JUNCTION CONNECTOR)

C

12.

CHECK FOR SHORT TO +B IN CAN BUS LINE (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 +B is connected.

Click here

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

*1

DLC3

-

-

*a

Component with harness connected

(Network Gateway ECU)

-

-

Standard Resistance:

Tester Connection

Condition

Specified Condition

J75-22 (CA2H) - J141-16 (BAT)

Cable disconnected from negative (-) battery terminal

6 kΩ or higher

J75-7 (CA2L) - J141-16 (BAT)

HINT:

If the resistance changes to 6 kΩ or higher when the connector is disconnected from the ECU or sensor, there may be a short in the ECU or sensor.

OK

REPLACE CORRESPONDING ECU OR SENSOR

NG

REPAIR OR REPLACE CORRESPONDING ECU OR SENSOR CAN BUS LINE OR CONNECTOR

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