Problem Symptoms Table
WARNING: This page is about a different car, the 2008 Lexus LS 600hL. However, it is still accessible from the selected car via links, so may be relevant.
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 fuses and relays related to this system before inspecting the suspected areas below.
Dynamic Radar Cruise Control System
PROBLEM SYMPTOMS CHART
| Symptom | Suspected Area | Refer to |
|---|---|---|
| Vehicle-to-vehicle distance cannot be changed with distance control switch | Steering pad switch with modulator | INSTALLATION |
| Steering pad ECU | - | |
| Driving support ECU | REMOVAL | |
| System cannot be changed to constant speed mode | Cruise control switch circuit | CRUISE CONTROL SWITCH CIRCUIT |
| Skid control ECU | REMOVAL | |
| Shift lever position sensor | INSPECTION | |
| Stop light switch circuit | DTC C1A05 STOP LIGHT SWITCH CIRCUIT | |
| CAN communication system | CAN COMMUNICATION SYSTEM | |
| Hybrid vehicle control ECU | REMOVAL | |
| Driving support ECU | REMOVAL | |
| System cannot be changed to vehicle-to-vehicle distance control mode | Front millimeter wave radar sensor | MILLIMETER WAVE RADAR SENSOR |
| Cruise control switch circuit | CRUISE CONTROL SWITCH CIRCUIT | |
| Skid control ECU | REMOVAL | |
| Shift lever position sensor | INSPECTION | |
| Windshield wiper switch | REMOVAL | |
| Stop light switch circuit | DTC C1A05 STOP LIGHT SWITCH CIRCUIT | |
| CAN communication system | CAN COMMUNICATION SYSTEM | |
| Hybrid vehicle control ECU | REMOVAL | |
| Driving support ECU | REMOVAL | |
| During constant speed mode operation, system is canceled | Cruise control switch circuit | CRUISE CONTROL SWITCH CIRCUIT |
| Skid control ECU | REMOVAL | |
| Shift lever position sensor | INSPECTION | |
| Stop light switch circuit | DTC C1A05 STOP LIGHT SWITCH CIRCUIT | |
| CAN communication system | CAN COMMUNICATION SYSTEM | |
| Hybrid vehicle control ECU | REMOVAL | |
| Driving support ECU | REMOVAL | |
| During vehicle-to-vehicle distance control mode operation, system is canceled | Front millimeter wave radar sensor | MILLIMETER WAVE RADAR SENSOR |
| Cruise control switch circuit | CRUISE CONTROL SWITCH CIRCUIT | |
| Skid control ECU | REMOVAL | |
| Shift lever position sensor | INSPECTION | |
| Windshield wiper switch | REMOVAL | |
| Stop light switch circuit | DTC C1A05 STOP LIGHT SWITCH CIRCUIT | |
| CAN communication system | CAN COMMUNICATION SYSTEM | |
| Hybrid vehicle control ECU | REMOVAL | |
| Driving support ECU | REMOVAL | |
| During constant speed mode operation, hunting occurs | Skid control ECU | REMOVAL |
| CAN communication system | CAN COMMUNICATION SYSTEM | |
| Hybrid vehicle control ECU | REMOVAL | |
| Driving support ECU | REMOVAL | |
| During vehicle-to-vehicle distance control mode operation, hunting occurs | Front millimeter wave radar sensor | MILLIMETER WAVE RADAR SENSOR |
| Skid control ECU | REMOVAL | |
| CAN communication system | CAN COMMUNICATION SYSTEM | |
| Hybrid vehicle control ECU | REMOVAL | |
| Driving support ECU | REMOVAL | |
| Shift lever cancel operation does not operate | Shift lever position sensor | INSPECTION |
| Hybrid vehicle control ECU | REMOVAL | |
| CAN communication system | CAN COMMUNICATION SYSTEM | |
| Driving support ECU | REMOVAL | |
| Low speed limit cancel operation does not operate | Skid control ECU | REMOVAL |
| CAN communication system | CAN COMMUNICATION SYSTEM | |
| Driving support ECU | REMOVAL | |
| During vehicle-to-vehicle distance control mode, wiper cancel operation does not operate | Windshield wiper switch | REMOVAL |
| CAN communication system | CAN COMMUNICATION SYSTEM | |
| Driving support ECU | REMOVAL | |
| Even though front millimeter wave radar sensor is not dirty, "CLEAN RADAR SENSOR" is displayed | Adjust front millimeter wave radar sensor | ADJUSTMENT |
| Front millimeter wave radar sensor radiator grille is dirty | - |