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 | Refer To |
|---|---|---|
| Main switch cannot be turned ON. (CRUISE main indicator light on combination meter does not illuminate.) | Cruise control switch circuit | Refer to Cruise Control Switch Circuit |
| CRUISE main indicator light circuit | Refer to Cruise Main Indicator Light Circuit | |
| If the symptom still occurs after the above areas have been inspected and have proven to be normal, replace the ECM. (for 2UR-GSE) | Refer to COMPONENTS | |
| 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 | Refer to Cruise Control Switch Circuit |
| If the symptom still occurs after the above area has been inspected and has proven to be normal, replace the ECM. (for 2UR-GSE) | Refer to COMPONENTS | |
| 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 | Refer to Cruise Control Switch Circuit |
| Stop light switch circuit | Refer to DTC P0571: Brake Switch "A" Circuit | |
| Transmission range sensor circuit (for AA80E) | Refer to DTC P0705: Transmission Range Sensor Circuit Malfunction (PRNDL Input) | |
| Shift paddle switch circuit (for AA80E) | Refer to Shift Paddle Switch Circuit | |
| Vehicle speed sensor circuit | Refer to DTC P0500: Vehicle Speed Sensor Malfunction; DTC P0503: Vehicle Speed Sensor "A" Intermittent / Erratic / High | |
| Meter/gauge system | Refer to HOW TO PROCEED WITH TROUBLESHOOTING | |
| If the symptom still occurs after the above areas have been inspected and have proven to be normal, replace the ECM. (for 2UR-GSE) | Refer to COMPONENTS | |
| While vehicle is driven with cruise control on, the control is canceled. (CRUISE main indicator light remains on.) | Cruise control switch circuit | Refer to Cruise Control Switch Circuit |
| Vehicle speed sensor circuit | Refer to DTC P0500: Vehicle Speed Sensor Malfunction; DTC P0503: Vehicle Speed Sensor "A" Intermittent / Erratic / High | |
| Stop light switch circuit | Refer to DTC P0571: Brake Switch "A" Circuit | |
| Meter/gauge system | Refer to HOW TO PROCEED WITH TROUBLESHOOTING | |
| Transmission range sensor circuit (for AA80E) | Refer to DTC P0705: Transmission Range Sensor Circuit Malfunction (PRNDL Input) | |
| Shift paddle switch circuit (for AA80E) | Refer to Shift Paddle Switch Circuit | |
| If the symptom still occurs after the above areas have been inspected and have proven to be normal, replace the ECM. (for 2UR-GSE) | Refer to COMPONENTS | |
| Hunting (Speed is not constant.) | Vehicle speed sensor circuit | Refer to DTC P0500: Vehicle Speed Sensor Malfunction; DTC P0503: Vehicle Speed Sensor "A" Intermittent / Erratic / High |
| Malfunction in speed meter circuit | Refer to Speedometer Malfunction | |
| Millimeter wave radar sensor power source circuit | Refer to Millimeter Wave Radar Sensor Power Source Circuit | |
| Distance control ECU power source circuit | Refer to Distance Control ECU Power Source Circuit | |
| Distance control ECU | Refer to TERMINALS OF ECU | |
| If the symptom still occurs after the above areas have been inspected and have proven to be normal, replace the ECM. (for 2UR-GSE) | Refer to COMPONENTS | |
| Vehicle speed setting cannot be canceled. (When coast, acceleration, resume, set speed change function is operated with control switch.) | Cruise control switch circuit | Refer to Cruise Control Switch Circuit |
| If the symptom still occurs after the above area has been inspected and has proven to be normal, replace the ECM. (for 2UR-GSE) | Refer to COMPONENTS | |
| Erroneous detection or lost sight of the vehicle ahead | Clean radar sensor with soft cloth, etc. | - |
| Improper aiming of sensor beam axis | Refer to ADJUSTMENT | |
| Alarm buzzer does not sound. | Skid control buzzer circuit | Refer to Skid Control Buzzer Circuit |
| Vehicle stability control system | Refer to HOW TO PROCEED WITH TROUBLESHOOTING | |
| Millimeter wave radar sensor power source circuit | Refer to Millimeter Wave Radar Sensor Power Source Circuit | |
| Distance control ECU power source circuit | Refer to Distance Control ECU Power Source Circuit | |
| Distance control ECU | Refer to TERMINALS OF ECU | |
| If the symptom still occurs after the above areas have been inspected and have proven to be normal, replace the ECM. (for 2UR-GSE) | Refer to COMPONENTS | |
| Set distance cannot be changed. | Meter/gauge system | Refer to HOW TO PROCEED WITH TROUBLESHOOTING |
| Distance control switch circuit | Refer to Distance Control Switch Circuit | |
| Cruise control switch circuit | Refer to Cruise Control Switch Circuit | |
| Distance control ECU | Refer to TERMINALS OF ECU | |
| If the symptom still occurs after the above areas have been inspected and have proven to be normal, replace the ECM. (for 2UR-GSE) | Refer to COMPONENTS | |
| No information on the display | Meter/gauge system | Refer to HOW TO PROCEED WITH TROUBLESHOOTING |
| If the symptom still occurs after the above area has been inspected and has proven to be normal, replace the ECM. (for 2UR-GSE) | Refer to COMPONENTS | |
| No brake control (when decelerating) | Vehicle stability control system | Refer to HOW TO PROCEED WITH TROUBLESHOOTING |
| Distance control ECU power source circuit | Refer to Distance Control ECU Power Source Circuit | |
| Distance control ECU | Refer to TERMINALS OF ECU | |
| If the symptom still occurs after the above areas have been inspected and have proven to be normal, replace the ECM. (for 2UR-GSE) | Refer to COMPONENTS | |
| Constant speed mode cannot be turned on. | Cruise control switch circuit | Refer to Cruise Control Switch Circuit |
| Meter/gauge system | Refer to HOW TO PROCEED WITH TROUBLESHOOTING | |
| If the symptom still occurs after the above areas have been inspected and have proven to be normal, replace the ECM. (for 2UR-GSE) | Refer to COMPONENTS | |
| Vehicle speed cannot be canceled with wiper HI. (Including automatic wiper) | Rain sensor circuit | Refer to Rain Sensor Circuit |
| Wiper switch circuit | Refer to Wiper and Washer Switch Circuit | |
| Distance control ECU | Refer to TERMINALS OF ECU | |
| If the symptom still occurs after the above areas have been inspected and have proven to be normal, replace the ECM. (for 2UR-GSE) | Refer to COMPONENTS | |
| Setting cannot be canceled in SNOW mode. | Pattern select switch circuit (for AA80E) | Refer to Pattern Select Switch Snow Mode Circuit |
| Automatic transmission system (for AA80E) | Refer to HOW TO PROCEED WITH TROUBLESHOOTING | |
| If the symptom still occurs after the above areas have been inspected and have proven to be normal, replace the ECM. (for 2UR-GSE) | Refer to COMPONENTS | |
| Unable to adjust (complete) beam axis of millimeter wave radar sensor. | Check for DTC P1570 | Refer to DTC P1570: Radar Sensor Malfunction |
| Check position, distance and angle of reflector | Refer to ADJUSTMENT | |
| Check installation of millimeter wave radar sensor | Refer to INSTALLATION | |
| Millimeter wave radar sensor | Refer to COMPONENTS | |
| Distance control ECU | Refer to TERMINALS OF ECU | |
| If the symptom still occurs after the above areas have been inspected and have proven to be normal, replace the ECM. (for 2UR-GSE) | Refer to COMPONENTS | |
| Cannot change between constant speed control mode and vehicle-to-vehicle distance control mode. | Cruise control switch circuit | Refer to Cruise Control Switch Circuit |
| Millimeter wave radar sensor power source circuit | Refer to Millimeter Wave Radar Sensor Power Source Circuit | |
| Distance control ECU | Refer to TERMINALS OF ECU | |
| If the symptom still occurs after the above areas have been inspected and have proven to be normal, replace the ECM. (for 2UR-GSE) | Refer to COMPONENTS |