Tech Tips
Use the table below to help determine the cause of problem symptoms. If multiple suspected areas are listed, the potential causes of the symptoms are listed in order of probability in the "Suspected Area" column of the table. Check each symptom by checking the suspected areas in the order they are listed. Replace parts as necessary.
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 Click here.
| Symptom | Suspected Area | See page |
|---|---|---|
| The result of "How to Proceed with Troubleshooting" is "Open in Bus 2 Main Bus Line". | Open in Bus 2 Main Bus Line | |
| The result of "How to Proceed with Troubleshooting" is "Short in Bus 2 Lines". | Check Bus 2 Lines for Short Circuit | |
| The result of "How to Proceed with Troubleshooting" is "Short to +B in Bus 2 Line". | Check Bus 2 Line for Short to +B | |
| The result of "How to Proceed with Troubleshooting" is "Short to GND in Bus 2 Line". | Check Bus 2 Line for Short to GND | |
| The result of "How to Proceed with Troubleshooting" is "Open in One Side of Bus 2 Branch Line". | Open in One Side of Bus 2 Branch Line | |
| The result of "How to Proceed with Troubleshooting" is "Open in Bus 3 Main Bus Line". | Open in Bus 3 Main Bus Line | |
| The result of "How to Proceed with Troubleshooting" is "Short in Bus 3 Lines". | Check Bus 3 Lines for Short Circuit | |
| The result of "How to Proceed with Troubleshooting" is "Short to +B in Bus 3 Line". | Check Bus 3 Line for Short to +B | |
| The result of "How to Proceed with Troubleshooting" is "Short to GND in Bus 3 Line". | Check Bus 3 Line for Short to GND | |
| The result of "How to Proceed with Troubleshooting" is "Open in One Side of Bus 3 Branch Line". | Open in One Side of Bus 3 Branch Line | |
| The result of "How to Proceed with Troubleshooting" is "Open in Bus 5 Main Bus Line". | Open in Bus 5 Main Bus Line | |
| The result of "How to Proceed with Troubleshooting" is "Short in Bus 5 Lines". | Check Bus 5 Lines for Short Circuit | |
| The result of "How to Proceed with Troubleshooting" is "Short to +B in Bus 5 Line". | Check Bus 5 Line for Short to +B | |
| The result of "How to Proceed with Troubleshooting" is "Short to GND in Bus 5 Line". | Check Bus 5 Line for Short to GND | |
| The result of "How to Proceed with Troubleshooting" is "Open in One Side of Bus 5 Branch Line". | Open in One Side of Bus 5 Branch Line |
Tech Tips
Refer to How to Proceed with Troubleshooting for the Bus Check procedure.
| Symptom | Suspected Area | See page |
|---|---|---|
| Communication stop for "Skid Control (ABS/VSC/TRAC)" is indicated on the "Communication Bus Check" screen of the GTS. | Skid Control ECU Communication Stop Mode | |
| Communication stop for "Steering Control (VGRS)" is indicated on the "Communication Bus Check" screen of the GTS. (w/ Variable Gear Ratio Steering System) | Steering Control ECU Communication Stop Mode | |
| Communication stop for "Clearance Warning (Clearance Sonar)" is indicated on the "Communication Bus Check" screen of the GTS. (w/ TOYOTA Parking Assist-sensor System) | Clearance Warning ECU Communication Stop Mode | |
| Communication stop for "Air Conditioning Amplifier" is indicated on the "Communication Bus Check" screen of the GTS. | Air Conditioning Amplifier Communication Stop Mode | |
| Communication stop for "PPS" is indicated on the "Communication Bus Check" screen of the GTS. (w/ Variable Flow Control Solenoid Valve) | Power Steering ECU Communication Stop Mode | |
| Communication stop for "Spiral cable (Steering Angle Sensor)" is indicated on the "Communication Bus Check" screen of the GTS. | Steering Angle Sensor Communication Stop Mode | |
| Communication stop for "ECM (Engine)" is indicated on the "Communication Bus Check" screen of the GTS. | ECM Communication Stop Mode | |
| Communication stop for "Main Body" is indicated on the "Communication Bus Check" screen of the GTS. | Main Body ECU Communication Stop Mode | |
| Communication stop for "Combination Meter" is indicated on the "Communication Bus Check" screen of the GTS. | Combination Meter ECU Communication Stop Mode | |
| Communication stop for "Certification (Smart)" is indicated on the "Communication Bus Check" screen of the GTS. (w/ Entry and Start System) | Certification ECU Communication Stop Mode | |
| Communication stop for "Airbag" is indicated on the "Communication Bus Check" screen of the GTS. | Center Airbag Sensor Communication Stop Mode | |
| Communication stop for "Panoramic View Monitor" is indicated on the "Communication Bus Check" screen of the GTS. (w/ Multi-terrain Monitor System) | Parking Assist ECU Communication Stop Mode | |
| Communication stop for "Headlight swivel (AFS)" is indicated on the "Communication Bus Check" screen of the GTS. | AFS ECU Communication Stop Mode | |
| Communication stop for "4WD" is indicated on the "Communication Bus Check" screen of the GTS. | 4WD Control ECU Communication Stop Mode | |
| Communication stop for "Display and Navigation (AVN1)" is indicated on the "Communication Bus Check" screen of the GTS. (for Multi-media Module Receiver Type) | Multi-media Module Receiver Assembly Communication Stop Mode | |
| Communication stop for "Blind Spot Monitor Master" is indicated on the "Communication Bus Check" screen of the GTS. (w/ Blind Spot Monitor System) | Blind Spot Monitor Sensor Communication Stop Mode | |
| Communication stop for "Front Camera Module" is indicated on the "Communication Bus Check" screen of the GTS. (w/o Pre-crash Safety System, w/ Automatic High Beam System) | Inner Rear View Mirror Assembly Communication Stop Mode | |
| Communication stop for "Accessory Gateway" is indicated on the "Communication Bus Check" screen of the GTS. (w/ Bus Buffer ECU) | Bus Buffer ECU Communication Stop Mode | |
| Communication stop for "Suspension Control (Air Suspension)" is indicated on the "Communication Bus Check" screen of the GTS. (w/ Active Height Control Suspension) | Suspension Control ECU Communication Stop Mode | |
| Communication stop for "Driving Support (Cruise Control-ACC)" is indicated on the "Communication Bus Check" screen of the GTS. (w/ Pre-crash Safety System) | Driving Support ECU Communication Stop Mode | |
| Communication stop for "CAN Gateway" is indicated on the "Communication Bus Check" screen of the GTS. | Central Gateway ECU Communication Stop Mode | |
| Communication stop for "Front Radar" is indicated on the "Communication Bus Check" screen of the GTS. (w/ Pre-crash Safety System) | Millimeter Wave Radar Sensor Communication Stop Mode | |
| Communication stop for "Front Camera Module" is indicated on the "Communication Bus Check" screen of the GTS. (w/ Pre-crash Safety System) | Front Camera Module Communication Stop Mode | |
| Communication stop for "Tire Pressure" is indicated on the "Communication Bus Check" screen of the GTS. (w/ Tire Pressure Warning System) | Tire Pressure Monitor ECU Communication Stop Mode |
| Symptom | Suspected Area | See page |
|---|---|---|
| Although CAN communication is currently normal, ECUs connected to each bus store 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. |