Problem Symptoms Table
NOTE:
- When the distance control ECU and/or ECM are replaced with a new one, initialization must be performed.
- When the millimeter wave radar sensor is replaced with a new one, adjustment of the radar sensor beam axis must be performed.
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
| 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 | - |
| 2. CRUISE main indicator light circuit | - | |
| 3. ECM | - | |
| 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 | - |
| 2. ECM | - | |
| 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.) | 1. Cruise control switch circuit | - |
| 2. Stop light switch circuit | - | |
| 3. Park/Neutral position switch circuit | - | |
| 4. Vehicle speed sensor circuit | - | |
| 5. Transmission control switch circuit | - | |
| 6. Combination meter system | - | |
| 7. ECM | - | |
| While vehicle is driven with cruise control, the control is canceled. (CRUISE main indicator light remains on.) | 1. Cruise control switch circuit | - |
| 2. Vehicle speed sensor circuit | - | |
| 3. Stop light switch circuit | - | |
| 4. Combination meter system | - | |
| 5. Park/Neutral position switch circuit | - | |
| 6. ECM | - | |
| Hunting (Speed is not constant.) | 1. Vehicle speed sensor circuit | - |
| 2. ECM | - | |
| Vehicle speed setting cannot be canceled. (When coast, acceleration, resume, set speed change function is operated with control switch.) | 1. Cruise control switch circuit | - |
| 2. ECM | - | |
| Erroneous detection or lost sight of the vehicle ahead. | 1. Clean radar sensor with soft cloth, etc. | - |
| 2. Improper aiming of sensor beam axis | - | |
| Skid control buzzer does not sound. | 1. Buzzer circuit | - |
| 2. VSC system | - | |
| 3. Distance control ECU power source circuit | - | |
| 4. Distance control ECU | - | |
| 5. ECM | - | |
| Set distance cannot be changed. | 1. Combination meter system | - |
| 2. Distance control switch circuit | - | |
| 3. Distance control ECU | - | |
| 4. ECM | - | |
| No information on the display | 1. Combination meter system | - |
| 2. ECM | - | |
| No brake control (when decelerating) | 1. VSC system | - |
| 2. Distance control ECU power source circuit | - | |
| 3. Distance control ECU | - | |
| 4. ECM | - | |
| Constant speed mode cannot be turned on. | 1. Cruise control switch circuit | - |
| 2. Combination meter system | - | |
| 3. ECM | - | |
| Vehicle speed cannot be canceled with wiper HI. (Including automatic wiper) | 1. Wiper switch circuit | - |
| 2. Wiper signal circuit | - | |
| 3. Washer signal circuit | - | |
| 4. Distance control ECU | - | |
| 5. ECM | - | |
| When the washer is used, cruise control is canceled. | 1. Washer motor circuit | - |
| 2. Washer signal circuit | - | |
| 3. Distance control ECU | - | |
| 4. ECM | - | |
| Unable to adjust (complete) beam axis of millimeter wave radar sensor. | 1. Check position, distance and angle of reflector | - |
| 2. Check installation of millimeter wave radar sensor | - | |
| 3. Millimeter wave radar sensor | - | |
| 4. Distance control ECU | - | |
| 5. ECM | - | |
| Cannot change from constant speed control mode to vehicle-to-vehicle distance control mode. | 1. Cruise control switch circuit | - |
| 2. Millimeter wave radar sensor power source circuit | - | |
| 3. Distance control ECU | - | |
| 4. ECM | - | |
| The CRUISE main indicator light remains blinking. | 1. TC and CG terminal circuit | - |
| 2. If the symptoms still occur after the above area has been inspected and has proven to be normal, replace the ECM. | - |