Toyota Venza: Check CAN Bus Lines for Short Circuit

Toyota Venza Service Manual / Networking / Can Communication System / Check CAN Bus Lines for Short Circuit

DESCRIPTION

There may be a short circuit in the CAN bus main wire and/or CAN branch wire when the resistance between terminals 6 (CANH) and 14 (CANL) of the DLC3 is below 54 Ω.

Symptom	Trouble Area
Resistance between terminals 6 (CANH) and 14 (CANL) of DLC3 is below 54 Ω.	Short in CAN bus main wire Short in CAN bus branch wire Combination meter ECM Power steering ECU Center airbag sensor assembly Air conditioning amplifier3 Skid control ECU (Brake actuator) Steering angle sensor Yaw rate sensor Main body ECU (Driver side junction block) 4WD control ECU1 Certification ECU2 Power management control ECU2 Navigation receiver assembly4 Radio and display receiver assembly5 CAN No. 1 junction connector CAN No. 2 junction connector

Symptom

Trouble Area

Resistance between terminals 6 (CANH) and 14 (CANL) of DLC3 is below 54 Ω.

Short in CAN bus main wire
Short in CAN bus branch wire
Combination meter
ECM
Power steering ECU
Center airbag sensor assembly
Air conditioning amplifier*3
Skid control ECU (Brake actuator)
Steering angle sensor
Yaw rate sensor
Main body ECU (Driver side junction block)
4WD control ECU*1
Certification ECU*2
Power management control ECU*2
Navigation receiver assembly*4
Radio and display receiver assembly*5
CAN No. 1 junction connector
CAN No. 2 junction connector

*1: for AWD

*2: w/ Smart key system

*3: w/o Smart key system

*4: for Navigation system

*5: for Audio and visual system

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

Turn the ignition switch off before measuring the resistances between CAN bus main wires and between CAN bus branch wires.
Turn the ignition switch off before inspecting CAN bus wires for a ground short.
After the ignition switch is turned off, check that the key reminder warning system and light reminder warning system are not operating.
Before measuring the resistance, leave the vehicle as is for at least 1 minute and do not operate the ignition switch, any other switches or the doors. If any doors need to be opened in order to check connectors, open the doors and leave them open.

HINT:

Operating the ignition 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 IN CAN BUS WIRES (CAN NO. 1 J/C - CAN NO. 2 J/C)

(a) Turn the ignition switch off.

(b) Disconnect the CAN No. 1 junction connector (D56).

Text in Illustration

Front view of wire harness connector

(to CAN No. 1 Junction Connector)

to CAN No. 2 Junction Connector

Standard Resistance:

Tester Connection	Condition	Specified Condition
D56-9 (CANH) - D56-20 (CANL)	Ignition switch off	108 to 132 Ω

GO TO STEP 12

2.	CHECK FOR SHORT IN CAN BUS WIRES (CAN NO. 1 J/C - ECM)

(a) Disconnect the CAN No. 1 junction connector (A44).

Text in Illustration

Front view of wire harness connector

(to CAN No. 1 Junction Connector)

to ECM

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
A44-4 (CANH) - A44-15 (CANL)	Ignition switch off	108 to 132 Ω

GO TO STEP 11

3.	CHECK FOR SHORT IN CAN BUS WIRES (CAN NO. 1 J/C - SKID CONTROL ECU)

(a) Disconnect the skid control ECU connector.

Text in Illustration

*1	Front view of wire harness connector (to Skid Control ECU)

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
A44-1 (CANH) - A44-12 (CANL)	Ignition switch off	1 MΩ or higher

Text in Illustration

Front view of wire harness connector

(to CAN No. 1 Junction Connector)

to Skid Control ECU

REPAIR OR REPLACE CAN BUS BRANCH WIRE OR CONNECTOR (CAN NO. 1 J/C - SKID CONTROL ECU)

4.	CHECK FOR SHORT IN CAN BUS WIRES (CAN NO. 1 J/C - AIR CONDITIONING AMPLIFIER)

HINT:

For vehicles with smart key system, go to the next step.

(a) Disconnect the air conditioning amplifier connector.

Text in Illustration

*1	Front view of wire harness connector (to Air Conditioning Amplifier)

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
D56-8 (CANH) - D56-19 (CANL)	Ignition switch off	1 MΩ or higher

Text in Illustration

Front view of wire harness connector

(to CAN No. 1 Junction Connector)

to Air Conditioning Amplifier

REPAIR OR REPLACE CAN BUS BRANCH WIRE OR CONNECTOR (CAN NO. 1 J/C - AIR CONDITIONING AMPLIFIER)

5.	CHECK FOR SHORT IN CAN BUS WIRES (CAN NO. 1 J/C - 4WD CONTROL ECU)

HINT:

For 2WD vehicles, go to the next step.

(a) Disconnect the 4WD control ECU connector.

Text in Illustration

*1	Front view of wire harness connector (to 4WD Control ECU)

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
D56-11 (CANH) - D56-22 (CANL)	Ignition switch off	1 MΩ or higher

Text in Illustration

Front view of wire harness connector

(to CAN No. 1 Junction Connector)

to 4WD Control ECU

REPAIR OR REPLACE CAN BUS BRANCH WIRE OR CONNECTOR (CAN NO. 1 J/C - 4WD CONTROL ECU)

6.	CHECK FOR SHORT IN CAN BUS WIRES (CAN NO. 1 J/C - POWER MANAGEMENT CONTROL ECU)

HINT:

For vehicles without smart key system, go to the next step.

(a) Disconnect the power management control ECU connector (D43).

Text in Illustration

*1	Rear view of wire harness connector (to Power Management Control ECU)

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
D56-10 (CANH) - D56-21 (CANL)	Ignition switch off	1 MΩ or higher

Text in Illustration

Front view of wire harness connector

(to CAN No. 1 Junction Connector)

to Power Management Control ECU

REPAIR OR REPLACE CAN BUS BRANCH WIRE OR CONNECTOR (CAN NO. 1 J/C - POWER MANAGEMENT CONTROL ECU)

7.	CHECK FOR SHORT IN CAN BUS WIRES (CAN NO. 1 J/C)

(a) Reconnect the CAN No. 1 junction connector (A44).

(b) Reconnect the CAN No. 1 junction connector (D56).

Text in Illustration

DLC3

NOTICE:

The resistance must be measured after the main wire connected ECUs (ECM and combination meter), and CAN No. 1 and No. 2 junction connectors are reconnected.

Standard Resistance:

Tester Connection	Condition	Specified Condition
D1-6 (CANH) - D1-14 (CANL)	Ignition switch off	54 to 69 Ω

REPLACE CAN NO. 1 J/C

8.	CHECK FOR SHORT IN CAN BUS WIRES (SKID CONTROL ECU)

(a) Reconnect the skid control ECU connector.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
D1-6 (CANH) - D1-14 (CANL)	Ignition switch off	54 to 69 Ω

Text in Illustration

DLC3

Result	Proceed to
OK (for AWD and w/o Smart key system)	A
OK (for 2WD and w/o Smart key system)	B
OK (for AWD and w/ Smart key system)	C
OK (for 2WD and w/ Smart key system)	D
NG	E

REPLACE AIR CONDITIONING AMPLIFIER

GO TO STEP 10

REPLACE POWER MANAGEMENT CONTROL ECU

REPLACE BRAKE ACTUATOR (SKID CONTROL ECU)

9.	CHECK FOR SHORT IN CAN BUS WIRES (AIR CONDITIONING AMPLIFIER)

(a) Reconnect the air conditioning amplifier connector.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
D1-6 (CANH) - D1-14 (CANL)	Ignition switch off	54 to 69 Ω

Text in Illustration

DLC3

REPLACE 4WD CONTROL ECU

REPLACE AIR CONDITIONING AMPLIFIER

10.	CHECK FOR SHORT IN CAN BUS WIRES (POWER MANAGEMENT CONTROL ECU)

(a) Reconnect the power management control ECU connector.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
D1-6 (CANH) - D1-14 (CANL)	Ignition switch off	54 to 69 Ω

Text in Illustration

DLC3

REPLACE 4WD CONTROL ECU

REPLACE POWER MANAGEMENT CONTROL ECU

11.	CHECK FOR SHORT IN CAN BUS WIRES (ECM)

(a) Disconnect the ECM connector.

Text in Illustration

Front view of wire harness connector

(to ECM)

for 1AR-FE

for 2GR-FE

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
A44-4 (CANH) - A44-15 (CANL)	Ignition switch off	1 MΩ or higher

Text in Illustration

Front view of wire harness connector

(to CAN No. 1 Junction Connector)

to ECM

Result	Proceed to
OK (for 1AR-FE)	A
OK (for 2GR-FE)	B
NG	C

REPLACE ECM

REPAIR OR REPLACE CAN BUS MAIN WIRE OR CONNECTOR (CAN NO. 1 J/C - ECM)

12.	CHECK FOR SHORT IN CAN BUS WIRES (CAN NO. 2 J/C - CAN NO. 1 J/C)

(a) Reconnect the CAN No. 1 junction connector (D56).

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

Text in Illustration

Front view of wire harness connector

(to CAN No. 2 Junction Connector)

to CAN No. 1 Junction Connector

Standard Resistance:

Tester Connection	Condition	Specified Condition
D68-9 (CANH) - D68-20 (CANL)	Ignition switch off	108 to 132 Ω

REPAIR OR REPLACE CAN BUS MAIN WIRE OR CONNECTOR (CAN NO. 1 J/C - CAN NO. 2 J/C)

13.	CHECK FOR SHORT IN CAN BUS WIRES (CAN NO. 2 J/C - DLC3)

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
D68-6 (CANH) - D68-17 (CANL)	Ignition switch off	1 MΩ or higher

Text in Illustration

Front view of wire harness connector

(to CAN No. 2 Junction Connector)

to DLC3

REPAIR OR REPLACE CAN BRANCH WIRE CONNECTED TO DLC3

14.	CHECK FOR SHORT IN CAN BUS WIRES (CAN NO. 2 J/C - COMBINATION METER)

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
D68-8 (CANH) - D68-19 (CANL)	Ignition switch off	108 to 132 Ω

Text in Illustration

Front view of wire harness connector

(to CAN No. 2 Junction Connector)

to Combination Meter

GO TO STEP 31

15.	CHECK FOR SHORT IN CAN BUS WIRES (CAN NO. 2 J/C - CENTER AIRBAG SENSOR ASSEMBLY)

(a) Disconnect the center airbag sensor assembly connector (D6).

Text in Illustration

*1	Front view of wire harness connector (to Center Airbag Sensor Assembly)

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
D68-2 (CANH) - D68-13 (CANL)	Ignition switch off	1 MΩ or higher

Text in Illustration

Front view of wire harness connector

(to CAN No. 2 Junction Connector)

to Center Airbag Sensor Assembly

REPAIR OR REPLACE CAN BUS BRANCH WIRE OR CONNECTOR (CAN NO. 2 J/C - CENTER AIRBAG SENSOR ASSEMBLY)

16.	CHECK FOR SHORT IN CAN BUS WIRES (CAN NO. 2 J/C - YAW RATE SENSOR)

(a) Disconnect the yaw rate sensor connector.

Text in Illustration

*1	Front view of wire harness connector (to Yaw Rate Sensor)

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
D68-3 (CANH) - D68-14 (CANL)	Ignition switch off	1 MΩ or higher

Text in Illustration

Front view of wire harness connector

(to CAN No. 2 Junction Connector)

to Yaw Rate Sensor

REPAIR OR REPLACE CAN BUS BRANCH WIRE OR CONNECTOR (CAN NO. 2 J/C - YAW RATE SENSOR)

17.	CHECK FOR SHORT IN CAN BUS WIRES (CAN NO. 2 J/C - STEERING ANGLE SENSOR)

(a) Disconnect the steering angle sensor connector.

Text in Illustration

*1	Front view of wire harness connector (to Steering Angle Sensor)

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
D68-5 (CANH) - D68-16 (CANL)	Ignition switch off	1 MΩ or higher

Text in Illustration

Front view of wire harness connector

(to CAN No. 2 Junction Connector)

to Steering Angle Sensor

REPAIR OR REPLACE CAN BUS BRANCH WIRE OR CONNECTOR (CAN NO. 2 J/C - STEERING ANGLE SENSOR)

18.	CHECK FOR SHORT IN CAN BUS WIRES (CAN NO. 2 J/C - POWER STEERING ECU)

(a) Disconnect the power steering ECU connector (D20).

Text in Illustration

*1	Front view of wire harness connector (to Power Steering ECU)

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
D68-7 (CANH) - D68-18 (CANL)	Ignition switch off	1 MΩ or higher

Text in Illustration

Front view of wire harness connector

(to CAN No. 2 Junction Connector)

to Power Steering ECU

REPAIR OR REPLACE CAN BUS BRANCH WIRE OR CONNECTOR (CAN NO. 2 J/C - POWER STEERING ECU)

19.	CHECK FOR SHORT IN CAN BUS WIRES (CAN NO. 2 J/C - MAIN BODY ECU)

(a) Disconnect the main body ECU connector (D48).

Text in Illustration

*1	Front view of wire harness connector (to Main Body ECU)

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
D68-4 (CANH) - D68-15 (CANL)	Ignition switch off	1 MΩ or higher

Text in Illustration

Front view of wire harness connector

(to CAN No. 2 Junction Connector)

to Main Body ECU

Result	Proceed to
OK (w/ Smart key system)	A
OK (w/o Smart key system)	B
NG	C

GO TO STEP 21

REPAIR OR REPLACE CAN BUS BRANCH WIRE OR CONNECTOR (CAN NO. 2 J/C - MAIN BODY ECU)

20.	CHECK FOR SHORT IN CAN BUS WIRES (CAN NO. 2 J/C - CERTIFICATION ECU)

(a) Disconnect the certification ECU connector.

Text in Illustration

*1	Front view of wire harness connector (to Certification ECU)

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
D68-10 (CANH) - D68-21 (CANL)	Ignition switch off	1 MΩ or higher

Text in Illustration

Front view of wire harness connector

(to CAN No. 2 Junction Connector)

to Certification ECU

REPAIR OR REPLACE CAN BUS BRANCH WIRE OR CONNECTOR (CAN NO. 2 J/C - CERTIFICATION ECU)

21.	CHECK FOR SHORT IN CAN BUS WIRES (CAN NO. 2 J/C - NAVIGATION RECEIVER ASSEMBLY)

HINT:

For vehicles without navigation system, go to the next step.

(a) Disconnect the navigation receiver assembly connector.

Text in Illustration

*1	Front view of wire harness connector (to Navigation Receiver Assembly)

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
D68-11 (CANH) - D68-22 (CANL)	Ignition switch off	1 MΩ or higher

Text in Illustration

Front view of wire harness connector

(to CAN No. 2 Junction Connector)

to Navigation Receiver Assembly

REPAIR OR REPLACE CAN BUS BRANCH WIRE OR CONNECTOR (CAN NO. 2 J/C - NAVIGATION RECEIVER ASSEMBLY)

22.	CHECK FOR SHORT IN CAN BUS WIRES (CAN NO. 2 J/C - RADIO AND DISPLAY RECEIVER ASSEMBLY)

HINT:

For vehicles without audio and visual system, go to the next step.

(a) Disconnect the radio and display receiver assembly connector.

Text in Illustration

*1	Front view of wire harness connector (to Radio and Display Receiver Assembly)

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
D68-11 (CANH) - D68-22 (CANL)	Ignition switch off	1 MΩ or higher

Text in Illustration

Front view of wire harness connector

(to CAN No. 2 Junction Connector)

to Radio and Display Receiver Assembly

REPAIR OR REPLACE CAN BUS BRANCH WIRE OR CONNECTOR (CAN NO. 2 J/C - RADIO AND DISPLAY RECEIVER ASSEMBLY)

23.	CHECK FOR SHORT IN CAN BUS WIRES (CAN NO. 2 J/C)

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

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

NOTICE:

The resistance must be measured after the main wire connected ECUs (ECM and combination meter), and CAN No. 1 and No. 2 junction connectors are reconnected.

Standard Resistance:

Tester Connection	Condition	Specified Condition
D1-6 (CANH) - D1-14 (CANL)	Ignition switch off	54 to 69 Ω

Text in Illustration

DLC3

REPLACE CAN NO. 2 J/C

24.	CHECK FOR SHORT IN CAN BUS WIRES (CENTER AIRBAG SENSOR ASSEMBLY)

(a) Reconnect the center airbag sensor assembly connector.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
D1-6 (CANH) - D1-14 (CANL)	Ignition switch off	54 to 69 Ω

Text in Illustration

DLC3

REPLACE CENTER AIRBAG SENSOR ASSEMBLY

25.	CHECK FOR SHORT IN CAN BUS WIRES (YAW RATE SENSOR)

(a) Reconnect the yaw rate sensor connector.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
D1-6 (CANH) - D1-14 (CANL)	Ignition switch off	54 to 69 Ω

Text in Illustration

DLC3

REPLACE YAW RATE SENSOR

26.	CHECK FOR SHORT IN CAN BUS WIRES (STEERING ANGLE SENSOR)

(a) Reconnect the steering angle sensor connector.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
D1-6 (CANH) - D1-14 (CANL)	Ignition switch off	54 to 69 Ω

Text in Illustration

DLC3

REPLACE STEERING ANGLE SENSOR

27.	CHECK FOR SHORT IN CAN BUS WIRES (POWER STEERING ECU)

(a) Reconnect the power steering ECU connector.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
D1-6 (CANH) - D1-14 (CANL)	Ignition switch off	54 to 69 Ω

Text in Illustration

DLC3

Result:

Result	Proceed to
OK (for Navigation system)	A
OK (for Audio and visual system)	B
NG	C

GO TO STEP 29

REPLACE POWER STEERING ECU

28.	CHECK FOR SHORT IN CAN BUS WIRES (NAVIGATION RECEIVER ASSEMBLY)

(a) Reconnect the navigation receiver assembly connector.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
D1-6 (CANH) - D1-14 (CANL)	Ignition switch off	54 to 69 Ω

Text in Illustration

DLC3

Result:

Result	Proceed to
OK (w/o Smart key system)	A
OK (w/ Smart key system)	B
NG (w/ Navigation system)	C

REPLACE MAIN BODY ECU (DRIVER SIDE JUNCTION BLOCK)

GO TO STEP 30

REPLACE NAVIGATION RECEIVER ASSEMBLY

29.	CHECK FOR SHORT IN CAN BUS WIRES (RADIO AND DISPLAY RECEIVER ASSEMBLY)

(a) Reconnect the radio and display receiver assembly connector.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
D1-6 (CANH) - D1-14 (CANL)	Ignition switch off	54 to 69 Ω

Text in Illustration

DLC3

Result:

Result	Proceed to
OK (w/o Smart key system)	A
OK (w/ Smart key system)	B
NG	C

REPLACE MAIN BODY ECU (DRIVER SIDE JUNCTION BLOCK)

REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY

30.	CHECK FOR SHORT IN CAN BUS WIRES (MAIN BODY ECU)

(a) Reconnect the main body ECU connector.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
D1-6 (CANH) - D1-14 (CANL)	Ignition switch off	54 to 69 Ω

Text in Illustration

DLC3

REPLACE SMART KEY ECU ASSEMBLY (CERTIFICATION ECU)

REPLACE MAIN BODY ECU (DRIVER SIDE JUNCTION BLOCK)

31.	CHECK FOR SHORT IN CAN BUS WIRES (COMBINATION METER)

(a) Disconnect the combination meter connector (E1).

Text in Illustration

*1	Front view of wire harness connector (to Combination Meter)

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
D68-8 (CANH) - D68-19 (CANL)	Ignition switch off	1 MΩ or higher

Text in Illustration

Front view of wire harness connector

(to CAN No. 2 Junction Connector)

to Combination Meter

REPLACE COMBINATION METER

REPAIR OR REPLACE CAN BUS MAIN WIRE OR CONNECTOR (CAN NO. 2 J/C - COMBINATION METER)

Open in CAN Main Bus Line

DESCRIPTION There may be an open circuit in the CAN bus main wire and/or the DLC3 branch wire when the resistance between terminals 6 (CANH) and 14 (CANL) of the DLC3 is 70 Ω or higher. ...

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