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 fuse and relay related to this system before inspecting the suspected areas below.
Dynamic radar cruise control system
PROBLEM SYMPTOMS CHART
| Symptom | Suspected area | See |
|---|---|---|
| Main switch cannot turned ON (CRUISE main indicator light combination meter does not illuminate) | 1. Cruise control switch circuit | CRUISE CONTROL SWITCH CIRCUIT |
| 2. CRUISE main indicator light circuit | CRUISE MAIN INDICATOR LIGHT CIRCUIT | |
| 3. Hybrid vehicle control 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) | 1. Cruise control switch circuit | CRUISE CONTROL SWITCH CIRCUIT |
| 2. Hybrid vehicle control ECU | - | |
| Vehicle speed setting cannot be done (CRUISE main indicator light combination meter illuminates when main switch is turned ON and remains illuminated when operating SET function) | 1. Cruise control switch circuit | CRUISE CONTROL SWITCH CIRCUIT |
| 2. Stop light switch circuit | DTC P0571 BRAKE SWITCH "A" CIRCUIT | |
| 3. Shift lever position sensor | SHIFT LEVER POSITION SENSOR | |
| 4. Transmission control switch circuit | PARTS LOCATION | |
| 5. Combination meter | - | |
| 6. Hybrid vehicle control ECU | - | |
| While vehicle is driven with cruise control, set control is cancel (CRUISE main indicator light remains illuminated) | 1. Cruise control switch circuit | CRUISE CONTROL SWITCH CIRCUIT |
| 2. Vehicle speed sensor circuit | DTC P0500 VEHICLE SPEED SENSOR MALFUNCTION | |
| 3. Stop light switch circuit | DTC P0571 BRAKE SWITCH "A" CIRCUIT | |
| 4. CRUISE main indicator light circuit | CRUISE MAIN INDICATOR LIGHT CIRCUIT | |
| 5. Shift lever position sensor | SHIFT LEVER POSITION SENSOR | |
| 6. Hybrid vehicle control ECU | - | |
| Hunting (Speed is not constant) | 1. Vehicle speed sensor circuit | DTC P0500 VEHICLE SPEED SENSOR MALFUNCTION |
| 2. Speedometer malfunction | SPEEDOMETER MALFUNCTION | |
| 3. Millimeter wave radar sensor power source circuit | MILLIMETER WAVE RADAR SENSOR POWER SOURCE CIRCUIT | |
| 4. Distance control ECU power source circuit | DISTANCE CONTROL ECU POWER SOURCE CIRCUIT | |
| 5. Distance control ECU (Cruise control ECU) | - | |
| Vehicle speed setting cannot be canceled (When Coast, Acceleration, Resume, Set speed change and control switch are operated) | 1. Cruise control switch circuit | CRUISE CONTROL SWITCH CIRCUIT |
| 2. Hybrid vehicle control ECU | - | |
| Erroneous detection or lost sight of vehicle in front | 1. Clean laser sensor with soft cloth, etc. | - |
| 2. Improper aiming of sensor beam axis | - | |
| Warning buzzer does not sound | 1. Buzzer circuit | SKID CONTROL BUZZER CIRCUIT |
| 2. VSC system | HOW TO PROCEED WITH TROUBLESHOOTING | |
| 3. Millimeter wave radar sensor power source circuit | MILLIMETER WAVE RADAR SENSOR POWER SOURCE CIRCUIT | |
| 4. Distance control ECU power source circuit | DISTANCE CONTROL ECU POWER SOURCE CIRCUIT | |
| 5. Distance control ECU (Cruise control ECU) | - | |
| 6. Hybrid vehicle control ECU | - | |
| Set distance cannot be changed | 1. Meter / gauge system | HOW TO PROCEED WITH TROUBLESHOOTING |
| 2. Distance control switch circuit | DISTANCE CONTROL SWITCH CIRCUIT | |
| 3. Cruise control switch circuit | CRUISE CONTROL SWITCH CIRCUIT | |
| 4. Hybrid vehicle control ECU | - | |
| No display | 1. Meter / gauge system | HOW TO PROCEED WITH TROUBLESHOOTING |
| 2. Hybrid vehicle control ECU | - | |
| No brake control (when decelerating) | 1. VSC system | HOW TO PROCEED WITH TROUBLESHOOTING |
| 2. Distance control ECU power source circuit | DISTANCE CONTROL ECU POWER SOURCE CIRCUIT | |
| 3. Distance control ECU (Cruise control ECU) | - | |
| 4. Hybrid vehicle control ECU | - | |
| Constant speed control mode cannot be turned on | 1. Cruise control switch circuit | CRUISE CONTROL SWITCH CIRCUIT |
| 2. Meter / gauge system | HOW TO PROCEED WITH TROUBLESHOOTING | |
| 3. Hybrid vehicle control ECU | - | |
| Vehicle speed cannot be canceled with wiper HI (Including automatic wiper) | 1. Rain sensor | RAIN SENSOR |
| 2. Wiper switch circuit | WIPER SIGNAL CIRCUIT | |
| 3. Distance control ECU (Cruise control ECU) | - | |
| 4. Hybrid vehicle control ECU | - | |
| Setting cannot be canceled in SNOW mode | 1. Hybrid mode select switch | PARTS LOCATION |
| 2. Automatic transmission system | - | |
| 3. Hybrid vehicle control ECU | - | |
| Unable to adjust beam axis of millimeter wave radar sensor | 1. Check for DTC P1570 | DTC P1570 RADAR SENSOR MALFUNCTION |
| 2. Check position, distance and angle of reflector | - | |
| 3. Check installation of millimeter wave radar sensor | - | |
| 4. Millimeter wave radar sensor | MILLIMETER WAVE RADAR SENSOR | |
| 5. Distance control ECU (Cruise control ECU) | - | |
| 6. Hybrid vehicle control ECU | - | |
| Cannot change between constant speed control mode and vehicle-to-vehicle distance control mode | 1. Cruise control switch circuit | CRUISE CONTROL SWITCH CIRCUIT |
| 2. Hybrid vehicle control ECU | - |