Toyota Venza: Check CAN Bus Line for Short to GND

Toyota Venza Service Manual / Networking / Can Communication System / Check CAN Bus Line for Short to GND

DESCRIPTION

There may be a short circuit between the CAN bus main wire and GND when there is no resistance between terminals 6 (CANH) and 4 (CG) or 14 (CANL) and 4 (CG) of the DLC3.

Symptom	Trouble Area
No resistance exists between terminals 6 (CANH) and 4 (CG) or 14 (CANL) and 4 (CG) of DLC3.	Short to GND in CAN bus main wire Short to GND 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

No resistance exists between terminals 6 (CANH) and 4 (CG) or 14 (CANL) and 4 (CG) of DLC3.

Short to GND in CAN bus main wire
Short to GND 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 TO GND IN CAN BUS WIRE (CAN NO. 1 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
D1-6 (CANH) - D1-4 (CG)	Ignition switch off	200 Ω or higher
D1-14 (CANL) - D1-4 (CG)	Ignition switch off	200 Ω or higher

Text in Illustration

DLC3

GO TO STEP 4

2.	CHECK FOR SHORT TO GND IN CAN BUS WIRE (CAN NO. 1 J/C)

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

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

Standard Resistance:

Tester Connection	Condition	Specified Condition	Connected to
A44-1 (CANH) - D1-4 (CG)	Ignition switch off	200 Ω or higher	Skid control ECU
A44-12 (CANL) - D1-4 (CG)	Ignition switch off	200 Ω or higher	Skid control ECU
A44-4 (CANH) - D1-4 (CG)	Ignition switch off	200 Ω or higher	ECM
A44-15 (CANL) - D1-4 (CG)	Ignition switch off	200 Ω or higher	ECM

Text in Illustration

*1	Front view of wire harness connector (to CAN No. 1 Junction Connector)
*2	DLC3
*3	to Skid Control ECU
*4	to ECM

Result	Proceed to
OK	A
NG (Skid control ECU branch wire)	B
NG (ECM main wire)	C

GO TO STEP 8

GO TO STEP 9

3.	CHECK FOR SHORT TO GND IN CAN BUS WIRE (CAN NO. 1 J/C)

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

Standard Resistance:

Tester Connection	Condition	Specified Condition	Connected to
D56-8 (CANH) - D1-4 (CG)	Ignition switch off	200 Ω or higher	Air conditioning amplifier*1
D56-19 (CANL) - D1-4 (CG)	Ignition switch off	200 Ω or higher	Air conditioning amplifier*1
D56-10 (CANH) - D1-4 (CG)	Ignition switch off	200 Ω or higher	Power management control ECU*2
D56-21 (CANL) - D1-4 (CG)	Ignition switch off	200 Ω or higher	Power management control ECU*2
D56-11 (CANH) - D1-4 (CG)	Ignition switch off	200 Ω or higher	4WD control ECU*3
D56-22 (CANL) - D1-4 (CG)	Ignition switch off	200 Ω or higher	4WD control ECU*3

*1: w/o Smart key system
*2: w/ Smart key system
*3: for AWD

Text in Illustration

*1	Front view of wire harness connector (to CAN No. 1 Junction Connector)
*2	DLC3
*3	to Air Conditioning Amplifier
*4	to Power Management Control ECU
*5	to 4WD Control ECU

Result	Proceed to
OK	A
NG (Air conditioning amplifier branch wire)	B
NG (Power management control ECU branch wire)	C
NG (4WD control ECU branch wire)	D

REPLACE CAN NO. 1 J/C

GO TO STEP 10

GO TO STEP 11

GO TO STEP 12

4.	CHECK FOR SHORT TO GND IN CAN BUS WIRE (CAN NO. 2 J/C - CAN NO. 1 J/C)

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

Text in Illustration

Front view of wire harness connector

(to CAN No. 2 Junction Connector)

DLC3

to CAN No. 1 Junction Connector

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
D68-9 (CANH) - D1-4 (CG)	Ignition switch off	200 Ω or higher
D68-20 (CANL) - D1-4 (CG)	Ignition switch off	200 Ω or higher

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

5.	CHECK FOR SHORT TO GND IN CAN BUS WIRE (CAN NO. 2 J/C)

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

Standard Resistance:

Tester Connection	Condition	Specified Condition	Connected to
D68-2 (CANH) - D1-4 (CG)	Ignition switch off	200 Ω or higher	Center airbag sensor assembly
D68-13 (CANL) - D1-4 (CG)	Ignition switch off	200 Ω or higher	Center airbag sensor assembly
D68-3 (CANH) - D1-4 (CG)	Ignition switch off	200 Ω or higher	Yaw rate sensor
D68-14 (CANL) - D1-4 (CG)	Ignition switch off	200 Ω or higher	Yaw rate sensor
D68-4 (CANH) - D1-4 (CG)	Ignition switch off	200 Ω or higher	Main body ECU
D68-15 (CANL) - D1-4 (CG)	Ignition switch off	200 Ω or higher	Main body ECU
D68-5 (CANH) - D1-4 (CG)	Ignition switch off	200 Ω or higher	Steering angle sensor
D68-16 (CANL) - D1-4 (CG)	Ignition switch off	200 Ω or higher	Steering angle sensor

Text in Illustration

*1	Front view of wire harness connector (to CAN No. 2 Junction Connector)
*2	DLC3
*3	to Center Airbag Sensor Assembly
*4	to Yaw Rate Sensor
*5	to Main Body ECU
*6	to Steering Angle Sensor

Result	Proceed to
OK	A
NG (Center airbag sensor assembly branch wire)	B
NG (Yaw rate sensor branch wire)	C
NG (Main body ECU branch wire)	D
NG (Steering angle sensor branch wire)	E

GO TO STEP 13

GO TO STEP 14

GO TO STEP 15

GO TO STEP 16

6.	CHECK FOR SHORT TO GND IN CAN BUS WIRE (CAN NO. 2 J/C)

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

Standard Resistance:

Tester Connection	Condition	Specified Condition	Connected to
D68-6 (CANH) - D1-4 (CG)	Ignition switch off	200 Ω or higher	DLC3
D68-17 (CANL) - D1-4 (CG)	Ignition switch off	200 Ω or higher	DLC3
D68-7 (CANH) - D1-4 (CG)	Ignition switch off	200 Ω or higher	Power steering ECU
D68-18 (CANL) - D1-4 (CG)	Ignition switch off	200 Ω or higher	Power steering ECU
D68-8 (CANH) - D1-4 (CG)	Ignition switch off	200 Ω or higher	Combination meter
D68-19 (CANL) - D1-4 (CG)	Ignition switch off	200 Ω or higher	Combination meter
D68-10 (CANH) - D1-4 (CG)	Ignition switch off	200 Ω or higher	Certification ECU*1
D68-21 (CANL) - D1-4 (CG)	Ignition switch off	200 Ω or higher	Certification ECU*1

*1: w/ Smart key system

Text in Illustration

*1	Front view of wire harness connector (to CAN No. 2 Junction Connector)
*2	DLC3
*3	to DLC3
*4	to Power Steering ECU
*5	to Combination Meter
*6	to Certification ECU

Result	Proceed to
OK	A
NG (DLC3 branch wire)	B
NG (Power steering ECU branch wire)	C
NG (Combination meter main wire)	D
NG (Certification ECU branch wire)	E

REPAIR OR REPLACE CAN BRANCH WIRE CONNECTED TO DLC3

GO TO STEP 17

GO TO STEP 18

GO TO STEP 19

7.	CHECK FOR SHORT TO GND IN CAN BUS WIRE (CAN NO. 2 J/C)

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

Standard Resistance:

Tester Connection	Condition	Specified Condition	Connected to
D68-11 (CANH) - D1-4 (CG)	Ignition switch off	200 Ω or higher	Navigation receiver assembly (for Navigation system) Radio and display receiver assembly (for Audio and visual system)
D68-22 (CANL) - D1-4 (CG)	Ignition switch off	200 Ω or higher

Text in Illustration

*1	Front view of wire harness connector (to CAN No. 2 Junction Connector)
*2	DLC3
*3	to Navigation Receiver Assembly to Radio and Display Receiver Assembly

Result:

Result	Proceed to
OK	A
NG (Navigation receiver assembly branch wire)	B
NG (Radio and display receiver assembly branch wire)	C

REPLACE CAN NO. 2 J/C

GO TO STEP 20

GO TO STEP 21

8.	CHECK FOR SHORT TO GND IN CAN BUS WIRE (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) - D1-4 (CG)	Ignition switch off	200 Ω or higher
A44-12 (CANL) - D1-4 (CG)	Ignition switch off	200 Ω or higher

Text in Illustration

Front view of wire harness connector

(to CAN No. 1 Junction Connector)

DLC3

to Skid Control ECU

REPLACE BRAKE ACTUATOR (SKID CONTROL ECU)

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

9.	CHECK FOR SHORT TO GND IN CAN BUS WIRE (CAN NO. 1 J/C - 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) - D1-4 (CG)	Ignition switch off	200 Ω or higher
A44-15 (CANL) - D1-4 (CG)	Ignition switch off	200 Ω or higher

Text in Illustration

Front view of wire harness connector

(to CAN No. 1 Junction Connector)

DLC3

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)

10.	CHECK FOR SHORT TO GND IN CAN BUS WIRE (CAN NO. 1 J/C - AIR CONDITIONING AMPLIFIER)

(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) - D1-4 (CG)	Ignition switch off	200 Ω or higher
D56-19 (CANL) - D1-4 (CG)	Ignition switch off	200 Ω or higher

Text in Illustration

Front view of wire harness connector

(to CAN No. 1 Junction Connector)

DLC3

to Air Conditioning Amplifier

REPLACE AIR CONDITIONING AMPLIFIER

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

11.	CHECK FOR SHORT TO GND IN CAN BUS WIRE (CAN NO. 1 J/C - POWER MANAGEMENT CONTROL ECU)

(a) Disconnect the power management control ECU connector.

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) - D1-4 (CG)	Ignition switch off	200 Ω or higher
D56-21 (CANL) - D1-4 (CG)	Ignition switch off	200 Ω or higher

Text in Illustration

Front view of wire harness connector

(to CAN No. 1 Junction Connector)

DLC3

to Power Management Control ECU

REPLACE POWER MANAGEMENT CONTROL ECU

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

12.	CHECK FOR SHORT TO GND IN CAN BUS WIRE (CAN NO. 1 J/C - 4WD CONTROL ECU)

(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) - D1-4 (CG)	Ignition switch off	200 Ω or higher
D56-22 (CANL) - D1-4 (CG)	Ignition switch off	200 Ω or higher

Text in Illustration

Front view of wire harness connector

(to CAN No. 1 Junction Connector)

DLC3

to 4WD Control ECU

REPLACE 4WD CONTROL ECU

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

13.	CHECK FOR SHORT TO GND IN CAN BUS WIRE (CAN NO. 2 J/C - CENTER AIRBAG SENSOR ASSEMBLY)

(a) Disconnect the center airbag sensor assembly connector.

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) - D1-4 (CG)	Ignition switch off	200 Ω or higher
D68-13 (CANL) - D1-4 (CG)	Ignition switch off	200 Ω or higher

Text in Illustration

Front view of wire harness connector

(to CAN No. 2 Junction Connector)

DLC3

to Center Airbag Sensor Assembly

REPLACE CENTER AIRBAG SENSOR ASSEMBLY

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

14.	CHECK FOR SHORT TO GND IN CAN BUS WIRE (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) - D1-4 (CG)	Ignition switch off	200 Ω or higher
D68-14 (CANL) - D1-4 (CG)	Ignition switch off	200 Ω or higher

Text in Illustration

Front view of wire harness connector

(to CAN No. 2 Junction Connector)

DLC3

to Yaw Rate Sensor

REPLACE YAW RATE SENSOR

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

15.	CHECK FOR SHORT TO GND IN CAN BUS WIRE (CAN NO. 2 J/C - MAIN BODY ECU)

(a) Disconnect the main body ECU connector.

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) - D1-4 (CG)	Ignition switch off	200 Ω or higher
D68-15 (CANL) - D1-4 (CG)	Ignition switch off	200 Ω or higher

Text in Illustration

Front view of wire harness connector

(to CAN No. 2 Junction Connector)

DLC3

to Main Body ECU

REPLACE MAIN BODY ECU (DRIVER SIDE JUNCTION BLOCK)

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

16.	CHECK FOR SHORT TO GND IN CAN BUS WIRE (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) - D1-4 (CG)	Ignition switch off	200 Ω or higher
D68-16 (CANL) - D1-4 (CG)	Ignition switch off	200 Ω or higher

Text in Illustration

Front view of wire harness connector

(to CAN No. 2 Junction Connector)

DLC3

to Steering Angle Sensor

REPLACE STEERING ANGLE SENSOR

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

17.	CHECK FOR SHORT TO GND IN CAN BUS WIRE (CAN NO. 2 J/C - POWER STEERING ECU)

(a) Disconnect the power steering ECU connector.

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) - D1-4 (CG)	Ignition switch off	200 Ω or higher
D68-18 (CANL) - D1-4 (CG)	Ignition switch off	200 Ω or higher

Text in Illustration

Front view of wire harness connector

(to CAN No. 2 Junction Connector)

DLC3

to Power Steering ECU

REPLACE POWER STEERING ECU

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

18.	CHECK FOR SHORT TO GND IN CAN BUS WIRE (CAN NO. 2 J/C - COMBINATION METER)

(a) Disconnect the combination meter connector.

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) - D1-4 (CG)	Ignition switch off	200 Ω or higher
D68-19 (CANL) - D1-4 (CG)	Ignition switch off	200 Ω or higher

Text in Illustration

Front view of wire harness connector

(to CAN No. 2 Junction Connector)

DLC3

to Combination Meter

REPLACE COMBINATION METER

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

19.	CHECK FOR SHORT TO GND IN CAN BUS WIRE (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) - D1-4 (CG)	Ignition switch off	200 Ω or higher
D68-21 (CANL) - D1-4 (CG)	Ignition switch off	200 Ω or higher

Text in Illustration

Front view of wire harness connector

(to CAN No. 2 Junction Connector)

DLC3

to Certification ECU

REPLACE SMART KEY ECU ASSEMBLY (CERTIFICATION ECU)

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

20.	CHECK FOR SHORT TO GND IN CAN BUS WIRE (CAN NO. 2 J/C - NAVIGATION RECEIVER ASSEMBLY)

(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) - D1-4 (CG)	Ignition switch off	200 Ω or higher
D68-22 (CANL) - D1-4 (CG)	Ignition switch off	200 Ω or higher

Text in Illustration

Front view of wire harness connector

(to CAN No. 2 Junction Connector)

DLC3

to Navigation Receiver Assembly

REPLACE NAVIGATION RECEIVER ASSEMBLY

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

21.	CHECK FOR SHORT TO GND IN CAN BUS WIRE (CAN NO. 2 J/C - RADIO AND DISPLAY RECEIVER ASSEMBLY)

(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) - D1-4 (CG)	Ignition switch off	200 Ω or higher
D68-22 (CANL) - D1-4 (CG)	Ignition switch off	200 Ω or higher

Text in Illustration

Front view of wire harness connector

(to CAN No. 2 Junction Connector)

DLC3

to Radio and Display Receiver Assembly

REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY

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

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