DYNAMIC RADAR CRUISE CONTROL SYSTEM PROBLEM SYMPTOMS TABLE
Tech Tips
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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.
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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 main indicator light on combination meter does not illuminate.) | Cruise control switch circuit | |
| CRUISE main indicator light circuit | ||
| If the symptoms still occur after the above areas have been inspected and have proven to be normal, replace the ECM. (for 2UR-GSE) | ||
| 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 | |
| If the symptoms still occur after the above area has been inspected and has proven to be normal, replace the ECM. (for 2UR-GSE) | ||
| Vehicle speed setting cannot be done. (CRUISE main indicator light on combination meter illuminates when main switch is turned ON, and remains on when operating SET function.) | Cruise control switch circuit | |
| Stop light switch circuit | ||
| Transmission range sensor circuit (for AA80E) | ||
| Shift paddle switch circuit (for AA80E) | ||
| Vehicle speed sensor circuit | ||
| Meter/gauge system | ||
| If the symptoms still occur after the above areas have been inspected and have proven to be normal, replace the ECM. (for 2UR-GSE) | ||
| While vehicle is driven with cruise control, the control is canceled. (CRUISE main indicator light remains on.) | Cruise control switch circuit | |
| Vehicle speed sensor circuit | ||
| Stop light switch circuit | ||
| Meter/gauge system | ||
| Transmission range sensor circuit (for AA80E) | ||
| Shift paddle switch circuit (for AA80E) | ||
| If the symptoms still occur after the above areas have been inspected and have proven to be normal, replace the ECM. (for 2UR-GSE) | ||
| Hunting (Speed is not constant.) | Vehicle speed sensor circuit | |
| Malfunction in speed meter circuit | ||
| Millimeter wave radar sensor power source circuit | ||
| Distance control ECU power source circuit | ||
| Distance control ECU | ||
| If the symptoms still occur after the above areas have been inspected and have proven to be normal, replace the ECM. (for 2UR-GSE) | ||
| Vehicle speed setting cannot be canceled. (When coast, acceleration, resume, set speed change function is operated with control switch.) | Cruise control switch circuit | |
| If the symptoms still occur after the above area has been inspected and has proven to be normal, replace the ECM. (for 2UR-GSE) | ||
| Erroneous detection or lost sight of the vehicle ahead. | Clean radar sensor with soft cloth, etc. | - |
| Improper aiming of sensor beam axis | ||
| Alarm buzzer does not sound. | Skid control buzzer circuit | |
| Vehicle stability control system | ||
| Millimeter wave radar sensor power source circuit | ||
| Distance control ECU power source circuit | ||
| Distance control ECU | ||
| If the symptoms still occur after the above areas have been inspected and have proven to be normal, replace the ECM. (for 2UR-GSE) | ||
| Set distance cannot be changed. | Meter/gauge system | |
| Distance control switch circuit | ||
| Cruise control switch circuit | ||
| Distance control ECU | ||
| If the symptoms still occur after the above areas have been inspected and have proven to be normal, replace the ECM. (for 2UR-GSE) | ||
| No information on the display | Meter/gauge system | |
| If the symptoms still occur after the above area has been inspected and has proven to be normal, replace the ECM. (for 2UR-GSE) | ||
| No brake control (when decelerating) | Vehicle stability control system | |
| Distance control ECU power source circuit | ||
| Distance control ECU | ||
| If the symptoms still occur after the above areas have been inspected and have proven to be normal, replace the ECM. (for 2UR-GSE) | ||
| Constant speed mode cannot be turned on. | Cruise control switch circuit | |
| Meter/gauge system | ||
| If the symptoms still occur after the above areas have been inspected and have proven to be normal, replace the ECM. (for 2UR-GSE) | ||
| Vehicle speed cannot be canceled with wiper HI. (Including automatic wiper) | Rain sensor circuit | |
| Wiper switch circuit | ||
| Distance control ECU | ||
| If the symptoms still occur after the above areas have been inspected and have proven to be normal, replace the ECM. (for 2UR-GSE) | ||
| Setting cannot be canceled in SNOW mode. | Pattern select switch circuit (for AA80E) | |
| Automatic transmission system (for AA80E) | ||
| If the symptoms still occur after the above areas have been inspected and have proven to be normal, replace the ECM. (for 2UR-GSE) | ||
| Unable to adjust (complete) beam axis of millimeter wave radar sensor. | Check for DTC P1570 | |
| Check position, distance and angle of reflector | ||
| Check installation of millimeter wave radar sensor | ||
| Millimeter wave radar sensor | ||
| Distance control ECU | ||
| If the symptoms still occur after the above areas have been inspected and have proven to be normal, replace the ECM. (for 2UR-GSE) | ||
| Cannot change between constant speed control mode and vehicle-to-vehicle distance control mode. | Cruise control switch circuit | |
| Millimeter wave radar sensor power source circuit | ||
| Distance control ECU | ||
| If the symptoms still occur after the above areas have been inspected and have proven to be normal, replace the ECM. (for 2UR-GSE) |