DYNAMIC RADAR CRUISE CONTROL SYSTEM PROBLEM SYMPTOMS TABLE
Tech Tips
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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.
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Inspect the fuses and relays related to this system before inspecting the suspected areas below.
| Symptom | Suspected Area | See page |
|---|---|---|
| Main switch cannot be turned on (Cruise control indicator light combination meter does not illuminate) | Cruise control switch circuit | |
| Cruise main indicator light circuit | ||
| Driving support ECU | ||
| Combination meter assembly | ||
| ECM (for 2GR-FSE) | ||
| ECM (for 4GR-FSE) | ||
| Vehicle speed setting cannot be done (Cruise control indicator light on combination meter illuminates when main switch is turned on, but turns off when operating SET function) | Cruise control switch circuit | |
| Driving support ECU | ||
| Vehicle speed setting cannot be done (Cruise control indicator light on combination meter illuminates when main switch is turned on and remains illuminated when operating SET function) | Cruise control switch circuit | |
| Stop light switch circuit | ||
| Park/neutral position switch assembly (for A760H) | ||
| Park/neutral position switch assembly (for AA81E) | ||
| Park/neutral position switch assembly (for A960E) | ||
| Transmission control switch circuit (for A760H) | ||
| Transmission control switch circuit (for AA81E) | ||
| Transmission control switch circuit (for A960E) | ||
| Shift paddle switch circuit (for A760H) | ||
| Shift paddle switch circuit (for AA81E) | ||
| Shift paddle switch circuit (for A960E) | ||
| Integration control and panel assembly | ||
| Combination meter assembly | ||
| Driving support ECU | ||
| While vehicle is driven with cruise control, set control is cancel (Cruise control indicator light remains illuminated) | Cruise control switch circuit | |
| Brake actuator assembly | ||
| CAN communication system (for LHD) | ||
| CAN communication system (for RHD) | ||
| Stop light switch circuit | ||
| Cruise main indicator light circuit | ||
| Park/neutral position switch assembly (for A760H) | ||
| Park/neutral position switch assembly (for AA81E) | ||
| Park/neutral position switch assembly (for A960E) | ||
| Integration control and panel assembly | ||
| Driving support ECU | ||
| Hunting (Speed is not constant) | Brake actuator assembly | |
| CAN communication system (for LHD) | ||
| CAN communication system (for RHD) | ||
| Speedometer malfunction | ||
| Millimeter wave radar sensor power source circuit | ||
| Driving support ECU power source circuit | ||
| Millimeter wave radar sensor assembly | ||
| Driving support ECU | ||
| Vehicle speed setting cannot be canceled (When Coast, Acceleration, Resume, Set speed change and control switch are operated) | Cruise control switch circuit | |
| 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 | |
| Vehicle stability control system | ||
| Millimeter wave radar sensor power source circuit | ||
| Driving support ECU power source circuit | ||
| Millimeter wave radar sensor assembly | ||
| Driving support ECU | ||
| Set distance cannot be changed | Distance control switch circuit | |
| CAN communication system (for LHD) | ||
| CAN communication system (for RHD) | ||
| Driving support ECU | ||
| No display | Meter / gauge system | |
| CAN communication system (for LHD) | ||
| CAN communication system (for RHD) | ||
| Driving support ECU | ||
| No brake control (when decelerating) | Vehicle stability control system | |
| Driving support ECU power source circuit | ||
| CAN communication system (for LHD) | ||
| CAN communication system (for RHD) | ||
| Driving support ECU | ||
| Constant speed control mode cannot be turned on | Cruise control switch circuit | |
| Meter / gauge system | ||
| Vehicle speed cannot be canceled with wiper HI | Windshield wiper switch assembly | |
| Driving support ECU | ||
| Unable to adjust beam axis of millimeter wave radar sensor | Check for DTC C1A10 | |
| Check position, distance and angle of reflector | - | |
| Check installation of millimeter wave radar sensor assembly | - | |
| Millimeter wave radar sensor assembly | ||
| Driving support ECU | ||
| System cannot change between constant speed control mode and vehicle-to-vehicle distance control mode | Cruise control switch circuit | |
| Driving support ECU | ||
| Cruise control SET indicator light does not come on (SET function operates normally) | Cruise SET indicator light circuit | |
| ECM (for 2GR-FSE) | ||
| ECM (for 4GR-FSE) | ||
| Driving support ECU | ||
| Shift lever cancel operation does not operate | Park/neutral position switch assembly (for A760H) | |
| Park/neutral position switch assembly (for AA81E) | ||
| Park/neutral position switch assembly (for A960E) | ||
| ECM (for 2GR-FSE) | ||
| ECM (for 4GR-FSE) | ||
| Driving support ECU | ||
| Problem with headup display (w/ Headup Display) | Meter / gauge system | |
| Combination meter mirror ECU | ||
| Combination meter assembly | ||
| Driving support ECU |