Problem Symptoms Table
DYNAMIC LASER CRUISE CONTROL SYSTEM
PROBLEM SYMPTOMS CHART
| Symptom | Suspected Area | See |
|---|---|---|
| Main switch cannot be turned ON. (CRUISE main indicator light on 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 | TERMINALS OF 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 | TERMINALS OF ECU | |
| Vehicle speed setting cannot be done. (CRUISE main indicator light on 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. Park/Neutral position switch circuit (DTC P0705) | DTC P0705-757 Transmission Range Sensor Circuit; DTC P0705-758 Transmission Range Sensor Circuit; DTC P0851-775 Park / Neutral Switch Input Circuit Low | |
| 4. Combination meter system | HOW TO PROCEED WITH TROUBLESHOOTING | |
| 5. Hybrid vehicle control ECU | TERMINALS OF ECU | |
| While the vehicle is driven with cruise control, the set control is canceled. (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. Park/Neutral position switch circuit (DTC P0705) | DTC P0705-757 Transmission Range Sensor Circuit; DTC P0705-758 Transmission Range Sensor Circuit; DTC P0851-775 Park / Neutral Switch Input Circuit Low | |
| 6. Hybrid vehicle control ECU | TERMINALS OF ECU | |
| Hunting (Speed is not constant.) | 1. Vehicle speed sensor circuit | DTC P0500 VEHICLE SPEED SENSOR MALFUNCTION |
| 2. Malfunction in speed meter circuit | Speedometer Malfunction | |
| 3. Laser sensor power source circuit | LASER SENSOR POWER SOURCE CIRCUIT | |
| 4. Distance control ECU power source circuit | DISTANCE CONTROL ECU POWER SOURCE CIRCUIT | |
| 5. Distance control ECU | TERMINALS OF ECU | |
| 6. Hybrid vehicle control ECU | TERMINALS OF 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 | TERMINALS OF ECU | |
| Erroneous detection or lost sight of the vehicle ahead | 1. Clean laser sensor with soft cloth, etc. | - |
| 2. Improper aiming of sensor beam axis | REMOVAL | |
| Alarm buzzer does not sound. | 1. Buzzer circuit | Skid Control Buzzer Circuit |
| 2. VSC system | HOW TO PROCEED WITH TROUBLESHOOTING | |
| 3. Laser sensor power source circuit | LASER SENSOR POWER SOURCE CIRCUIT | |
| 4. Distance control ECU power source circuit | DISTANCE CONTROL ECU POWER SOURCE CIRCUIT | |
| 5. Distance control ECU | TERMINALS OF ECU | |
| 6. Hybrid vehicle control ECU | TERMINALS OF ECU | |
| Set distance cannot be changed. | 1. Combination meter 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 | TERMINALS OF ECU | |
| No display | 1. Combination meter system | HOW TO PROCEED WITH TROUBLESHOOTING |
| 2. Hybrid vehicle control ECU | TERMINALS OF 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 | TERMINALS OF ECU | |
| 4. Hybrid vehicle control ECU | TERMINALS OF ECU | |
| Constant speed mode cannot be turned on. | 1. Cruise control switch circuit | CRUISE CONTROL SWITCH CIRCUIT |
| 2. Combination meter system | HOW TO PROCEED WITH TROUBLESHOOTING | |
| 3. Hybrid vehicle control ECU | TERMINALS OF ECU | |
| Vehicle speed cannot be canceled with wiper HI. (Including automatic wiper) | 1. Rain sensor circuit | Rain Sensor Circuit |
| 2. Wiper switch circuit | Wiper and Washer Switch Circuit | |
| 3. Distance control ECU | TERMINALS OF ECU | |
| 4. Hybrid vehicle control ECU | TERMINALS OF ECU | |
| Setting cannot be canceled in SNOW mode. | 1. Hybrid vehicle control ECU | TERMINALS OF ECU |
| Unable to adjust (complete) 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 | REMOVAL | |
| 3. Check installation of laser sensor | REMOVAL | |
| 4. Laser sensor | LASER SENSOR POWER SOURCE CIRCUIT | |
| 5. Distance control ECU | TERMINALS OF ECU | |
| 6. Hybrid vehicle control ECU | TERMINALS OF 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 | TERMINALS OF ECU |