Problem Symptoms Table
HINT:
- Use the table below to help determine the cause of the problem symptom. 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.
- Problem symptoms may occur if the electric power control system's functions malfunction. Follow the HOW TO PROCEED WITH TROUBLESHOOTING procedures.
Dynamic Radar Cruise Control System
DYNAMIC RADAR CRUISE CONTROL SYSTEM CHART
| Symptom | Suspected Area | See |
|---|---|---|
| Main switch cannot be turned ON (CRUISE main indicator light combination meter does not illuminate) | Cruise control switch circuit | CRUISE CONTROL SWITCH CIRCUIT |
| CRUISE main indicator light circuit | CRUISE MAIN INDICATOR LIGHT CIRCUIT | |
| Driving support ECU | DRIVING SUPPORT ECU | |
| Vehicle speed setting cannot be done (CRUISE main indicator light on combination meter illuminates when main switch is turned ON, but turns off when operating SET function) | Cruise control switch circuit | CRUISE CONTROL SWITCH CIRCUIT |
| Driving support ECU | DRIVING SUPPORT ECU | |
| Vehicle speed setting cannot be done (CRUISE main indicator light on combination meter illuminates when main switch is turned ON and remains illuminated when operating SET function) | Cruise control switch circuit | CRUISE CONTROL SWITCH CIRCUIT |
| Stop light switch circuit | DTC C1A05 STOP LIGHT SWITCH CIRCUIT | |
| Park/neutral position switch | INSPECTION | |
| Transmission control switch circuit | TRANSMISSION CONTROL SWITCH CIRCUIT | |
| Combination meter | COMBINATION METER | |
| Driving support ECU | DRIVING SUPPORT ECU | |
| While vehicle is driven with cruise control, set control is cancel (CRUISE main indicator light remains illuminated) | Cruise control switch circuit | CRUISE CONTROL SWITCH CIRCUIT |
| Skid control ECU | REMOVAL | |
| CAN communication system | CAN COMMUNICATION SYSTEM | |
| Stop light switch circuit | DTC C1A05 STOP LIGHT SWITCH CIRCUIT | |
| CRUISE main indicator light circuit | CRUISE MAIN INDICATOR LIGHT CIRCUIT | |
| Park/neutral position switch | INSPECTION | |
| Driving support ECU | DRIVING SUPPORT ECU | |
| Hunting (Speed is not constant) | Skid control ECU | REMOVAL |
| CAN communication system | CAN COMMUNICATION SYSTEM | |
| Speedometer malfunction | SPEEDOMETER MALFUNCTION | |
| Front millimeter wave radar sensor power source circuit | MILLIMETER WAVE RADAR SENSOR POWER SOURCE CIRCUIT | |
| Driving support ECU power source circuit | ECU POWER SOURCE CIRCUIT | |
| Vehicle speed setting cannot be canceled (When Coast, Acceleration, Resume, Set speed change and control switch are operated) | Cruise control switch circuit | CRUISE CONTROL SWITCH CIRCUIT |
| Driving support ECU | DRIVING SUPPORT ECU | |
| Erroneous detection or lost sight of vehicle in front | Clean radar sensor with soft cloth, etc. | - |
| Improper aiming of sensor beam axis | - | |
| Warning buzzer does not sound | Warning buzzer | DTC C1A4A SKID CONTROL BUZZER CIRCUIT |
| Electronically control brake system | HOW TO PROCEED WITH TROUBLESHOOTING | |
| Front millimeter wave radar sensor power source circuit | MILLIMETER WAVE RADAR SENSOR POWER SOURCE CIRCUIT | |
| Driving support ECU power source circuit | ECU POWER SOURCE CIRCUIT | |
| Driving support ECU | DRIVING SUPPORT ECU | |
| Set distance cannot be changed | Distance control switch circuit | DISTANCE CONTROL SWITCH CIRCUIT |
| CAN communication system | CAN COMMUNICATION SYSTEM | |
| Driving support ECU | DRIVING SUPPORT ECU | |
| No display | Meter/gauge system | HOW TO PROCEED WITH TROUBLESHOOTING |
| CAN communication system | CAN COMMUNICATION SYSTEM | |
| Driving support ECU | DRIVING SUPPORT ECU | |
| No brake control (when decelerating) | Electronically control brake system | HOW TO PROCEED WITH TROUBLESHOOTING |
| Driving support ECU power source circuit | ECU POWER SOURCE CIRCUIT | |
| CAN communication system | CAN COMMUNICATION SYSTEM | |
| Driving support ECU | DRIVING SUPPORT ECU | |
| Constant speed control mode cannot be turned on | Cruise control switch circuit | CRUISE CONTROL SWITCH CIRCUIT |
| Meter/gauge system | HOW TO PROCEED WITH TROUBLESHOOTING | |
| Vehicle speed cannot be canceled with wiper HI (Including automatic wiper) | Windshield wiper switch | WIPER SWITCH |
| Driving support ECU | DRIVING SUPPORT ECU | |
| Unable to adjust beam axis of front millimeter wave radar sensor | Check for DTC C1A10 | DTC C1A10 FRONT RADAR SENSOR |
| Check position, distance and angle of reflector | - | |
| Check installation of front millimeter wave radar sensor | - | |
| Front millimeter wave radar sensor | MILLIMETER WAVE RADAR SENSOR | |
| Driving support ECU | DRIVING SUPPORT ECU | |
| System cannot change between constant speed control mode and vehicle-to-vehicle distance control mode | Cruise control switch circuit | CRUISE CONTROL SWITCH CIRCUIT |
| Driving support ECU | DRIVING SUPPORT ECU |