Problem Symptoms Table
HINT:
- 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.
DYNAMIC RADAR CRUISE CONTROL SYSTEM
| Symptom | Suspected Area | See |
|---|---|---|
| The cruise control switch (ON-OFF button) cannot be turned on. | Driving support ECU power source circuit | Refer to ECU Power Source Circuit |
| Cruise control switch circuit | Refer to Cruise Control Switch Circuit | |
| Cruise main indicator light circuit | Refer to Cruise Main Indicator Light Circuit | |
| Power management control ECU | Refer to REMOVAL | |
| Driving support ECU assembly | Refer to REMOVAL | |
| Setting cannot be changed between constant speed control mode and vehicle-to-vehicle distance control mode. | Cruise control switch circuit | Refer to Cruise Control Switch Circuit |
| Combination meter assembly | Refer to HOW TO PROCEED WITH TROUBLESHOOTING | |
| Driving support ECU assembly | Refer to REMOVAL | |
| Set distance cannot be changed. | Distance control switch circuit | Refer to Distance Control Switch Circuit |
| Combination meter assembly | Refer to HOW TO PROCEED WITH TROUBLESHOOTING | |
| Driving support ECU assembly | Refer to REMOVAL | |
| Setting cannot be canceled in vehicle-to-vehicle distance control mode. | Combination meter assembly | Refer to HOW TO PROCEED WITH TROUBLESHOOTING |
| Millimeter wave radar sensor assembly | Refer to REMOVAL | |
| Driving support ECU assembly | Refer to REMOVAL | |
| Vehicle speed setting cannot be performed. (The cruise control indicator light on combination meter assembly illuminates when the cruise control switch is turned on, but turns off when operating SET function.) | Cruise control switch circuit | Refer to Cruise Control Switch Circuit |
| Driving support ECU assembly | Refer to REMOVAL | |
| Vehicle speed setting cannot be performed with the constant speed mode. (The cruise control indicator light on combination meter assembly illuminates when the cruise control switch is turned on, and remains on when operating SET function is operating.) | Stop light switch circuit | Refer to DTC C1A05: Stop Light Switch Circuit; DTC C1A4B: Stop Light Relay Circuit |
| Vehicle speed sensor circuit | Refer to HOW TO PROCEED WITH TROUBLESHOOTING | |
| Cruise control switch circuit | Refer to Cruise Control Switch Circuit | |
| Hybrid control system | Refer to HOW TO PROCEED WITH TROUBLESHOOTING | |
| Driving support ECU assembly | Refer to REMOVAL | |
| Vehicle speed setting cannot be performed with the vehicle-to-vehicle distance control mode. (The cruise control indicator light on combination meter assembly illuminates when cruise control switch is turned on, and remains on when SET function is operating.) | Millimeter wave radar sensor | Refer to REMOVAL |
| Stop light switch circuit | Refer to DTC C1A05: Stop Light Switch Circuit; DTC C1A4B: Stop Light Relay Circuit | |
| Vehicle speed sensor circuit | Refer to HOW TO PROCEED WITH TROUBLESHOOTING | |
| Cruise control switch circuit | Refer to Cruise Control Switch Circuit | |
| Hybrid control system | Refer to HOW TO PROCEED WITH TROUBLESHOOTING | |
| Wiper signal circuit | Refer to TERMINALS OF ECU | |
| Electronically controlled brake system | Refer to HOW TO PROCEED WITH TROUBLESHOOTING | |
| While vehicle is driven with cruise control on, the control is canceled. | Stop light switch circuit | Refer to DTC C1A05: Stop Light Switch Circuit; DTC C1A4B: Stop Light Relay Circuit |
| Hybrid control system | Refer to HOW TO PROCEED WITH TROUBLESHOOTING | |
| Electronically controlled brake system | Refer to HOW TO PROCEED WITH TROUBLESHOOTING | |
| Cruise control switch circuit | Refer to Cruise Control Switch Circuit | |
| Vehicle speed sensor circuit | Refer to HOW TO PROCEED WITH TROUBLESHOOTING | |
| Wiper signal circuit | Refer to TERMINALS OF ECU | |
| Driving support ECU assembly | Refer to REMOVAL | |
| Pulling back on the cruise control switch does not cancel the cruise control. (The cruise control indicator light remains on.) | Cruise control switch circuit | Refer to Cruise Control Switch Circuit |
| Driving support ECU assembly | Refer to REMOVAL | |
| Pulling back on the control switch does not cancel the cruise control. (The cruise control indicator light goes off.) | Driving support ECU assembly | Refer to REMOVAL |
| The cruise control is not canceled when vehicle speed drops below the low speed limit. (The cruise control indicator light remains on.) | Vehicle speed sensor circuit | Refer to HOW TO PROCEED WITH TROUBLESHOOTING |
| Driving support ECU assembly | Refer to REMOVAL | |
| The cruise control is not canceled when vehicle speed drops below the low speed limit. (The cruise control indicator light goes off.) | Hybrid control system | Refer to HOW TO PROCEED WITH TROUBLESHOOTING |
| Driving support ECU assembly | Refer to REMOVAL | |
| Depressing the brake pedal does not cancel the cruise control. (The cruise control indicator light remains on.) | Stop light switch circuit | Refer to DTC C1A05: Stop Light Switch Circuit; DTC C1A4B: Stop Light Relay Circuit |
| Driving support ECU assembly | Refer to REMOVAL | |
| Depressing the brake pedal does not cancel the cruise control. (The cruise control indicator light goes off.) | Driving support ECU assembly | Refer to REMOVAL |
| Vehicle speed cannot be canceled with wiper HI. (The cruise control indicator light remains on.) | Wiper signal circuit | Refer to TERMINALS OF ECU |
| Driving support ECU assembly | Refer to REMOVAL | |
| Vehicle speed cannot be canceled with wiper HI. (The cruise control indicator light goes off.) | Hybrid control system | Refer to HOW TO PROCEED WITH TROUBLESHOOTING |
| Driving support ECU assembly | Refer to REMOVAL | |
| Moving the shift lever does not cancel the cruise control. (The cruise control indicator light remains on.) | Hybrid control system | Refer to HOW TO PROCEED WITH TROUBLESHOOTING |
| Driving support ECU assembly | Refer to REMOVAL | |
| Moving the shift lever does not cancel the cruise control. (The cruise control indicator light goes off.) | Driving support ECU assembly | Refer to REMOVAL |
| Hunting (Speed is not constant.) | Millimeter wave radar sensor assembly | Refer to REMOVAL |
| Vehicle speed sensor circuit | Refer to HOW TO PROCEED WITH TROUBLESHOOTING | |
| SFI system | Refer to HOW TO PROCEED WITH TROUBLESHOOTING | |
| Hybrid control system | Refer to HOW TO PROCEED WITH TROUBLESHOOTING | |
| Driving support ECU assembly | Refer to REMOVAL | |
| Even though front millimeter wave radar sensor is not dirty, CLEAN RADAR SENSOR is displayed. | Millimeter wave radar sensor assembly is dirty | - |
| Adjust front millimeter wave radar sensor assembly | Refer to ADJUSTMENT | |
| Millimeter wave radar sensor assembly | Refer to REMOVAL | |
| No information on the multi-information display | Combination meter assembly | Refer to HOW TO PROCEED WITH TROUBLESHOOTING |
| Beam axis of millimeter wave radar sensor cannot be adjusted (completed). | Check position, distance and angle of reflector | Refer to ADJUSTMENT |
| Check installation of millimeter wave radar sensor | Refer to INSTALLATION | |
| Millimeter wave radar sensor assembly | Refer to REMOVAL | |
| Driving support ECU assembly | Refer to REMOVAL | |
| Alarm buzzer does not sound. | Power management control ECU | Refer to REMOVAL |
| Skid control buzzer circuit | Refer to Skid Control Buzzer Circuit | |
| Electronically controlled brake system | Refer to HOW TO PROCEED WITH TROUBLESHOOTING | |
| Millimeter wave radar sensor assembly | Refer to REMOVAL | |
| Driving support ECU assembly | Refer to REMOVAL | |
| No brake control (when decelerating) | Combination meter assembly | Refer to HOW TO PROCEED WITH TROUBLESHOOTING |
| Electronically controlled brake system | Refer to HOW TO PROCEED WITH TROUBLESHOOTING | |
| Driving support ECU assembly | Refer to REMOVAL | |
| "SET" is not displayed on the multi-information display. (SET function operates normally.) | Combination meter assembly | Refer to HOW TO PROCEED WITH TROUBLESHOOTING |
| Driving support ECU assembly | Refer to REMOVAL | |
| The cruise control indicator light remains blinking. | TC and CG terminal circuit | Refer to TC and CG Terminal Circuit |
| Driving support ECU assembly | Refer to REMOVAL |