CAN COMMUNICATION SYSTEM PROBLEM SYMPTOMS TABLE

Tech Tips


  • Use the table below to help determine the cause of problem symptoms.

  • Inspect the fuses and relays related to this system before inspecting the suspected areas below.

  • 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.

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Result List of How to Proceed with Troubleshooting
Symptom Suspected Area Link

Either of the following:


  • The problem symptom is that of Problem Symptom Pattern B and the suspected area is in Bus 1.

  • Resistance between CAN bus lines (CANH and CANL) in Bus 1 is 70 Ω or more.

 Open in Bus 1 Main Bus Line

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Either of the following:


  • The problem symptom is similar to that of Problem Symptom Pattern A and a short between CAN bus lines (CANH and CANL) in Bus 1 is suspected.

  • Resistance between CAN bus lines (CANH and CANL) in Bus 1 is below 54 Ω.

 Short in Bus 1 Lines

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Any of the following:


  • The problem symptom is similar to that of Problem Symptom Pattern A and a short to +B in a CAN bus line (CANH or CANL) in Bus 1 is suspected.

  • Resistance between CANH and +B in Bus 1 is below 6 kΩ.

  • Resistance between CANL and +B in Bus 1 is below 6 kΩ.

 Short to +B in Bus 1 Line

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Any of the following:


  • The problem symptom is similar to that of Problem Symptom Pattern A and a short to ground in a CAN bus line (CANH or CANL) in Bus 1 is suspected.

  • Resistance between CANH and ground in Bus 1 is below 200 Ω.

  • Resistance between CANL and ground in Bus 1 is below 200 Ω.

 Short to GND in Bus 1 Line

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Resistance between CANH and CANL is normal in Bus 1 and the problem symptom pattern in How to Use "Communication Bus Check" Screen in Inspection matches the symptoms when there is an open in one wire of a branch line in Bus 1. Open in One Side of Bus 1 Branch Line

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Either of the following:


  • The problem symptom is that of Problem Symptom Pattern B and the suspected area is in Bus 2.

  • Resistance between CAN bus lines (CANH and CANL) in Bus 2 is 70 Ω or more.

 Open in Bus 2 Main Bus Line

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Either of the following:


  • The problem symptom is similar to that of Problem Symptom Pattern A and a short between CAN bus lines (CANH and CANL) in Bus 2 is suspected.

  • Resistance between CAN bus lines (CANH and CANL) in Bus 2 is below 54 Ω.

 Short in Bus 2 Lines

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Any of the following:


  • The problem symptom is similar to that of Problem Symptom Pattern A and a short to +B in a CAN bus line (CANH or CANL) in Bus 2 is suspected.

  • Resistance between CANH and +B in Bus 2 is below 6 kΩ.

  • Resistance between CANL and +B in Bus 2 is below 6 kΩ.

 Short to +B in Bus 2 Line

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Any of the following:


  • The problem symptom is similar to that of Problem Symptom Pattern A and a short to ground in a CAN bus line (CANH or CANL) in Bus 2 is suspected.

  • Resistance between CANH and ground in Bus 2 is below 200 Ω.

  • Resistance between CANL and ground in Bus 2 is below 200 Ω.

 Short to GND in Bus 2 Line

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Resistance between CANH and CANL is normal in Bus 2 and the problem symptom pattern in How to Use "Communication Bus Check" Screen in Inspection matches the symptoms when there is an open in one wire of a branch line in Bus 2. Open in One Side of Bus 2 Branch Line

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Either of the following:


  • The problem symptom is that of Problem Symptom Pattern B and the suspected area is in Bus 3.

  • Resistance between CAN bus lines (CANH and CANL) in Bus 3 is 70 Ω or more.

 Open in Bus 3 Main Bus Line

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Either of the following:


  • The problem symptom is similar to that of Problem Symptom Pattern A and a short between CAN bus lines (CANH and CANL) in Bus 3 is suspected.

  • Resistance between CAN bus lines (CANH and CANL) in Bus 3 is below 54 Ω.

 Short in Bus 3 Lines

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Any of the following:


  • The problem symptom is similar to that of Problem Symptom Pattern A and a short to +B in a CAN bus line (CANH or CANL) in Bus 3 is suspected.

  • Resistance between CANH and +B in Bus 3 is below 6 kΩ.

  • Resistance between CANL and +B in Bus 3 is below 6 kΩ.

 Short to +B in Bus 3 Line

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Any of the following:


  • The problem symptom is similar to that of Problem Symptom Pattern A and a short to ground in a CAN bus line (CANH or CANL) in Bus 3 is suspected.

  • Resistance between CANH and ground in Bus 3 is below 200 Ω.

  • Resistance between CANL and ground in Bus 3 is below 200 Ω.

 Short to GND in Bus 3 Line

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Resistance between CANH and CANL is normal in Bus 3 and the problem symptom pattern in How to Use "Communication Bus Check" Screen in Inspection matches the symptoms when there is an open in one wire of a branch line in Bus 3. Open in One Side of Bus 3 Branch Line

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Either of the following:


  • The problem symptom is that of Problem Symptom Pattern B and the suspected area is in Bus 4.

  • Resistance between CAN bus lines (CANH and CANL) in Bus 4 is 70 Ω or more.

 Open in Bus 4 Main Bus Line

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Either of the following:


  • The problem symptom is similar to that of Problem Symptom Pattern A and a short between CAN bus lines (CANH and CANL) in Bus 4 is suspected.

  • Resistance between CAN bus lines (CANH and CANL) in Bus 4 is below 54 Ω.

 Short in Bus 4 Lines

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Any of the following:


  • The problem symptom is similar to that of Problem Symptom Pattern A and a short to +B in a CAN bus line (CANH or CANL) in Bus 4 is suspected.

  • Resistance between CANH and +B in Bus 4 is below 6 kΩ.

  • Resistance between CANL and +B in Bus 4 is below 6 kΩ.

 Short to +B in Bus 4 Line

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Any of the following:


  • The problem symptom is similar to that of Problem Symptom Pattern A and a short to ground in a CAN bus line (CANH or CANL) in Bus 4 is suspected.

  • Resistance between CANH and ground in Bus 4 is below 200 Ω.

  • Resistance between CANL and ground in Bus 4 is below 200 Ω.

 Short to GND in Bus 4 Line

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Resistance between CANH and CANL is normal in Bus 4 and the problem symptom pattern in How to Use "Communication Bus Check" Screen in Inspection matches the symptoms when there is an open in one wire of a branch line in Bus 4. Open in One Side of Bus 4 Branch Line

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Either of the following:


  • The problem symptom is that of Problem Symptom Pattern B and the suspected area is in Bus 5.

  • Resistance between CAN bus lines (CANH and CANL) in Bus 5 is 70 Ω or more.

 Open in Bus 5 Main Bus Line

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Either of the following:


  • The problem symptom is similar to that of Problem Symptom Pattern A and a short between CAN bus lines (CANH and CANL) in Bus 5 is suspected.

  • Resistance between CAN bus lines (CANH and CANL) in Bus 5 is below 54 Ω.

 Short in Bus 5 Lines

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Any of the following:


  • The problem symptom is similar to that of Problem Symptom Pattern A and a short to +B in a CAN bus line (CANH or CANL) in Bus 5 is suspected.

  • Resistance between CANH and +B in Bus 5 is below 6 kΩ.

  • Resistance between CANL and +B in Bus 5 is below 6 kΩ.

 Short to +B in Bus 5 Line

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Any of the following:


  • The problem symptom is similar to that of Problem Symptom Pattern A and a short to ground in a CAN bus line (CANH or CANL) in Bus 5 is suspected.

  • Resistance between CANH and ground in Bus 5 is below 200 Ω.

  • Resistance between CANL and ground in Bus 5 is below 200 Ω.

 Short to GND in Bus 5 Line

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Resistance between CANH and CANL is normal in Bus 5 and the problem symptom pattern in How to Use "Communication Bus Check" Screen in Inspection matches the symptoms when there is an open in one wire of a branch line in Bus 5. Open in One Side of Bus 5 Branch Line

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Either of the following:


  • Symptom of malfunction pattern for "CAN Bus Check Usage Method" is not applicable and problem applies to chassis local bus

  • Resistance between CAN bus lines (CANH and CANL) in Chassis Local Bus is 70 Ω or more.

 Open in Bus Chassis Local Bus Main Bus Line

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Either of the following:


  • Symptom of malfunction pattern for "CAN Bus Check Usage Method" is not applicable and problem applies to short in chassis local bus

  • Resistance between CAN bus lines (CANH and CANL) in Chassis Local Bus is below 54 Ω.

 Short in Bus Chassis Local Bus Lines

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Any of the following:


  • Symptom of malfunction pattern for "CAN Bus Check Usage Method" is not applicable and problem applies to short to +B in chassis local bus

  • Resistance between CANH and +B in Chassis Local Bus is below 6 kΩ.

  • Resistance between CANL and +B in Chassis Local Bus is below 6 kΩ.

 Short to +B in Chassis Local Bus Line

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Any of the following:


  • Symptom of malfunction pattern for "CAN Bus Check Usage Method" is not applicable and problem applies to short to ground in chassis local bus

  • Resistance between CANH and +B in Chassis Local Bus is below 6 kΩ.

  • Resistance between CANL and +B in Chassis Local Bus is below 6 kΩ.

 Short to GND in Chassis Local Bus Line

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Tech Tips

The suspected communication stop area can be determined based on the ECUs or sensors that are displayed as not communicating on the "Communication Bus Check" screen or "Communication Bus Check (Detail)" screen and by referring to the following table.

Communication Stop Mode Table (Open in bus line or other communication stop)
Symptom Suspected Area Link

Either of the following is met:


  • Communication stop for "Skid Control (ABS/VSC/TRAC)" is indicated on the "Communication Bus Check" screen of the GTS.

  • Communication stop history for "Skid Control (ABS/VSC/TRAC)" is indicated on the "Communication Bus Check (Detail)" screen of the GTS. (The Lost Communication Time value for "Skid Control (ABS/VSC/TRAC)" is 6 or more.)

 Skid Control ECU Communication Stop Mode

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Either of the following is met:


  • Communication stop for "Steering Control (VGRS)" is indicated on the "Communication Bus Check" screen of the GTS.

  • Communication stop history for "Steering Control (VGRS)" is indicated on the "Communication Bus Check (Detail)" screen of the GTS. (The Lost Communication Time value for "Steering Control (VGRS)" is 6 or more.)

 Steering Control ECU Communication Stop Mode

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Either of the following is met:


  • Communication stop for "DRS" is indicated on the "Communication Bus Check" screen of the GTS.

  • Communication stop history for "DRS" is indicated on the "Communication Bus Check (Detail)" screen of the GTS. (The Lost Communication Time value for "DRS" is 6 or more.)

 Rear Steering ECU Communication Stop Mode

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Either of the following is met:


  • Communication stop for "Clearance Warning (Clearance Sonar)" is indicated on the "Communication Bus Check" screen of the GTS.

  • Communication stop history for "Clearance Warning (Clearance Sonar)" is indicated on the "Communication Bus Check (Detail)" screen of the GTS. (The Lost Communication Time value for "Clearance Warning (Clearance Sonar)" is 6 or more.)

 Clearance Warning ECU Communication Stop Mode

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Either of the following is met:


  • Communication stop for "Air Conditioning Amplifier" is indicated on the "Communication Bus Check" screen of the GTS.

  • Communication stop history for "Air Conditioning Amplifier" is indicated on the "Communication Bus Check (Detail)" screen of the GTS. (The Lost Communication Time value for "Air Conditioning Amplifier" is 6 or more.)

 Air Conditioning Amplifier Communication Stop Mode

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Either of the following is met:


  • Communication stop for "Power Steering (EPS)" is indicated on the "Communication Bus Check" screen of the GTS.

  • Communication stop history for "Power Steering (EPS)" is indicated on the "Communication Bus Check (Detail)" screen of the GTS. (The Lost Communication Time value for "Power Steering (EPS)" is 6 or more.)

 Power Steering ECU Communication Stop Mode

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Either of the following is met:


  • Communication stop for "Spiral cable (Steering Angle Sensor)" is indicated on the "Communication Bus Check" screen of the GTS.

  • Communication stop history for "Spiral cable (Steering Angle Sensor)" is indicated on the "Communication Bus Check (Detail)" screen of the GTS. (The Lost Communication Time value for "Spiral cable (Steering Angle Sensor)" is 6 or more.)

 Steering Angle Sensor Communication Stop Mode

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Either of the following is met:


  • Communication stop for "Yaw Rate Sensor" is indicated on the "Communication Bus Check" screen of the GTS.

  • Communication stop history for "Yaw Rate Sensor" is indicated on the "Communication Bus Check (Detail)" screen of the GTS. (The Lost Communication Time value for "Yaw Rate Sensor" is 6 or more.)

 Yaw Rate Sensor Communication Stop Mode

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Either of the following is met:


  • Communication stop for "ECM (Engine)" is indicated on the "Communication Bus Check" screen of the GTS.

  • Communication stop history for "ECM (Engine)" is indicated on the "Communication Bus Check (Detail)" screen of the GTS. (The Lost Communication Time value for "ECM (Engine)" is 6 or more.)

 ECM Communication Stop Mode

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Either of the following is met:


  • Communication stop for "Transmission Control" is indicated on the "Communication Bus Check" screen of the GTS.

  • Communication stop history for "Transmission Control" is indicated on the "Communication Bus Check (Detail)" screen of the GTS. (The Lost Communication Time value for "Transmission Control" is 6 or more.)

 Shift Control ECU Communication Stop Mode

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Either of the following is met:


  • Communication stop for "Sub Battery Module" is indicated on the "Communication Bus Check" screen of the GTS.

  • Communication stop history for "Sub Battery Module" is indicated on the "Communication Bus Check (Detail)" screen of the GTS. (The Lost Communication Time value for "Sub Battery Module" is 6 or more.)

 Sub Battery Module Communication Stop Mode

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Either of the following is met:


  • Communication stop for "Main Body" is indicated on the "Communication Bus Check" screen of the GTS.

  • Communication stop history for "Main Body" is indicated on the "Communication Bus Check (Detail)" screen of the GTS. (The Lost Communication Time value for "Main Body" is 6 or more.)

 Main Body ECU Communication Stop Mode

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Either of the following is met:


  • Communication stop for "Combination Meter" is indicated on the "Communication Bus Check" screen of the GTS.

  • Communication stop history for "Combination Meter" is indicated on the "Communication Bus Check (Detail)" screen of the GTS. (The Lost Communication Time value for "Combination Meter" is 6 or more.)

 Combination Meter ECU Communication Stop Mode

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Either of the following is met:


  • Communication stop for "Certification (Smart)" is indicated on the "Communication Bus Check" screen of the GTS.

  • Communication stop history for "Certification (Smart)" is indicated on the "Communication Bus Check (Detail)" screen of the GTS. (The Lost Communication Time value for "Certification (Smart)" is 6 or more.)

 Certification ECU Communication Stop Mode

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Either of the following is met:


  • Communication stop for "Airbag" is indicated on the "Communication Bus Check" screen of the GTS.

  • Communication stop history for "Airbag" is indicated on the "Communication Bus Check (Detail)" screen of the GTS. (The Lost Communication Time value for "Airbag" is 6 or more.)

 Center Airbag Sensor Communication Stop Mode

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Either of the following is met:


  • Communication stop for "Pedestrian Protection" is indicated on the "Communication Bus Check" screen of the GTS.

  • Communication stop history for "Pedestrian Protection" is indicated on the "Communication Bus Check (Detail)" screen of the GTS. (The Lost Communication Time value for "Pedestrian Protection" is 6 or more.)

 Popup Hood ECU Communication Stop Mode

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Either of the following is met:


  • Communication stop for "Suspension Control (Air Suspension)" is indicated on the "Communication Bus Check" screen of the GTS.

  • Communication stop history for "Suspension Control (Air Suspension)" is indicated on the "Communication Bus Check (Detail)" screen of the GTS. (The Lost Communication Time value for "Suspension Control (Air Suspension)" is 6 or more.)

 Suspension Control ECU Communication Stop Mode

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Either of the following is met:


  • Communication stop for "HL AutoLeveling/AFS/AHS (Sub)" is indicated on the "Communication Bus Check" screen of the GTS.

  • Communication stop history for "HL AutoLeveling/AFS/AHS (Sub)" is indicated on the "Communication Bus Check (Detail)" screen of the GTS. (The Lost Communication Time value for "HL AutoLeveling/AFS/AHS (Sub)" is 6 or more.)

 Headlight ECU RH Communication Stop Mode

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Either of the following is met:


  • Communication stop for "HL AutoLeveling/AFS/AHS" is indicated on the "Communication Bus Check" screen of the GTS.

  • Communication stop history for "HL AutoLeveling/AFS/AHS" is indicated on the "Communication Bus Check (Detail)" screen of the GTS. (The Lost Communication Time value for "HL AutoLeveling/AFS/AHS" is 6 or more.)

 Headlight ECU LH Communication Stop Mode

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Either of the following is met:


  • Communication stop for "Electric Parking Brake" is indicated on the "Communication Bus Check" screen of the GTS.

  • Communication stop history for "Electric Parking Brake" is indicated on the "Communication Bus Check (Detail)" screen of the GTS. (The Lost Communication Time value for "Electric Parking Brake" is 6 or more.)

 Electric Parking Brake ECU Communication Stop Mode

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Either of the following is met:


  • Communication stop for "Display and Navigation (AVN)" is indicated on the "Communication Bus Check" screen of the GTS.

  • Communication stop history for "Display and Navigation (AVN)" is indicated on the "Communication Bus Check (Detail)" screen of the GTS. (The Lost Communication Time value for "Display and Navigation (AVN)" is 6 or more.)

 Radio Receiver Assembly Communication Stop Mode

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Either of the following is met:


  • Communication stop for "Blind Spot Monitor Master" is indicated on the "Communication Bus Check" screen of the GTS.

  • Communication stop history for "Blind Spot Monitor Master" is indicated on the "Communication Bus Check (Detail)" screen of the GTS. (The Lost Communication Time value for "Blind Spot Monitor Master" is 6 or more.)

 Blind Spot Monitor Sensor Communication Stop Mode

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Either of the following is met:


  • Communication stop for "Active Rear Wing" is indicated on the "Communication Bus Check" screen of the GTS.

  • Communication stop history for "Active Rear Wing" is indicated on the "Communication Bus Check (Detail)" screen of the GTS. (The Lost Communication Time value for "Active Rear Wing" is 6 or more.)

 Spoiler Control ECU Communication Stop Mode

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Either of the following is met:


  • Communication stop for "Active Noise Control" is indicated on the "Communication Bus Check" screen of the GTS.

  • Communication stop history for "Active Noise Control" is indicated on the "Communication Bus Check (Detail)" screen of the GTS. (The Lost Communication Time value for "Active Noise Control" is 6 or more.)

 Active Noise Control ECU Communication Stop Mode

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Either of the following is met:


  • Communication stop for "Accessory Gateway" is indicated on the "Communication Bus Check" screen of the GTS.

  • Communication stop history for "Accessory Gateway" is indicated on the "Communication Bus Check (Detail)" screen of the GTS. (The Lost Communication Time value for "Accessory Gateway" is 6 or more.)

 Bus Buffer ECU Communication Stop Mode

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Either of the following is met:


  • Communication stop for "Multiplex Tilt and Telescopic" is indicated on the "Communication Bus Check" screen of the GTS.

  • Communication stop history for "Multiplex Tilt and Telescopic" is indicated on the "Communication Bus Check (Detail)" screen of the GTS. (The Lost Communication Time value for "Multiplex Tilt and Telescopic" is 6 or more.)

 Tilt and Telescopic ECU Communication Stop Mode

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Either of the following is met:


  • Communication stop for "DCM" is indicated on the "Communication Bus Check" screen of the GTS.

  • Communication stop history for "DCM" is indicated on the "Communication Bus Check (Detail)" screen of the GTS. (The Lost Communication Time value for "DCM" is 6 or more.)

 DCM Communication Stop Mode

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Either of the following is met:


  • Communication stop for "Front Door LH/L-Mirror (FL-Door/L-Mirror)" is indicated on the "Communication Bus Check" screen of the GTS.

  • Communication stop history for "Front Door LH/L-Mirror (FL-Door/L-Mirror)" is indicated on the "Communication Bus Check (Detail)" screen of the GTS. (The Lost Communication Time value for "Front Door LH/L-Mirror (FL-Door/L-Mirror)" is 6 or more.)

 Front Door ECU LH Communication Stop Mode

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Either of the following is met:


  • Communication stop for "Front Door RH/R-Mirror (FR-Door/R-Mirror)" is indicated on the "Communication Bus Check" screen of the GTS.

  • Communication stop history for "Front Door RH/R-Mirror (FR-Door/R-Mirror)" is indicated on the "Communication Bus Check (Detail)" screen of the GTS. (The Lost Communication Time value for "Front Door RH/R-Mirror (FR-Door/R-Mirror)" is 6 or more.)

 Front Door ECU RH Communication Stop Mode

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Either of the following is met:


  • Communication stop for "D-Seat" is indicated on the "Communication Bus Check" screen of the GTS.

  • Communication stop history for "D-Seat" is indicated on the "Communication Bus Check (Detail)" screen of the GTS. (The Lost Communication Time value for "D-Seat" is 6 or more.)

 Front Seat ECU LH Communication Stop Mode (for LHD)

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Front Seat ECU RH Communication Stop Mode (for RHD)

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Either of the following is met:


  • Communication stop for "P-Seat" is indicated on the "Communication Bus Check" screen of the GTS.

  • Communication stop history for "P-Seat" is indicated on the "Communication Bus Check (Detail)" screen of the GTS. (The Lost Communication Time value for "P-Seat" is 6 or more.)

 Front Seat ECU RH Communication Stop Mode (for LHD)

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Front Seat ECU LH Communication Stop Mode (for RHD)

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Either of the following is met:


  • Communication stop for "Driving Support (Cruise Control-ACC)" is indicated on the "Communication Bus Check" screen of the GTS.

  • Communication stop history for "Driving Support (Cruise Control-ACC)" is indicated on the "Communication Bus Check (Detail)" screen of the GTS. (The Lost Communication Time value for "Driving Support (Cruise Control-ACC)" is 6 or more.)

 Driving Support ECU Communication Stop Mode

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Either of the following is met:


  • Communication stop for "Head Up Display" is indicated on the "Communication Bus Check" screen of the GTS.

  • Communication stop history for "Head Up Display" is indicated on the "Communication Bus Check (Detail)" screen of the GTS. (The Lost Communication Time value for "Head Up Display" is 6 or more.)

 Headup Display Communication Stop Mode

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Either of the following is met:


  • Communication stop for "Front Radar" is indicated on the "Communication Bus Check" screen of the GTS.

  • Communication stop history for "Front Radar" is indicated on the "Communication Bus Check (Detail)" screen of the GTS. (The Lost Communication Time value for "Front Radar" is 6 or more.)

 Millimeter Wave Radar Sensor Communication Stop Mode

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Either of the following is met:


  • Communication stop for "Parking Assist Monitor System" is indicated on the "Communication Bus Check" screen of the GTS.

  • Communication stop history for "Parking Assist Monitor System" is indicated on the "Communication Bus Check (Detail)" screen of the GTS. (The Lost Communication Time value for "Parking Assist Monitor System" is 6 or more.)

 Rear Television Camera Communication Stop Mode

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Either of the following is met:


  • Communication stop for "Front Camera Module" is indicated on the "Communication Bus Check" screen of the GTS.

  • Communication stop history for "Front Camera Module" is indicated on the "Communication Bus Check (Detail)" screen of the GTS. (The Lost Communication Time value for "Front Camera Module" is 6 or more.)

 Front Camera Module Communication Stop Mode

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Either of the following is met:


  • Communication stop for "Tire Pressure" is indicated on the "Communication Bus Check" screen of the GTS.

  • Communication stop history for "Tire Pressure" is indicated on the "Communication Bus Check (Detail)" screen of the GTS. (The Lost Communication Time value for "Tire Pressure" is 6 or more.)

 Tire Pressure Monitor ECU Communication Stop Mode

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DTC Combination Table (Open in Bus 1, Bus 2, Bus 3, Bus 4 or Bus 5)
Symptom Suspected Area Link
Although CAN communication is currently normal, an ECU connected to the CAN communication system has CAN communication DTCs. The probable part for which communication is interrupted can be determined using DTC Combination Table and comparing the DTCs output from ECUs connected to the CAN communication system.

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