Tech Tips
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.
The pre-collision system uses the CAN communication system. First, confirm that there are no malfunctions in the CAN communication system. Refer to How to Proceed with Troubleshooting.
| Symptom | Suspected Area | Link |
|---|---|---|
| "Pre-Collision System Unavailable" is displayed | Perform millimeter wave radar sensor assembly adjustment*1 | |
| Millimeter wave radar sensor assembly temperature malfunction | ||
| Millimeter wave radar sensor assembly low voltage malfunction | ||
| Millimeter wave radar sensor assembly | ||
| Combination meter assembly | ||
| "Pre-Collision System Unavailable Clean Sensor" is displayed | Foreign matter attached to millimeter wave radar sensor assembly | - |
| Millimeter wave radar sensor assembly | ||
| Combination meter assembly | ||
| "Front Camera Unavailable" is displayed | Check current condition of forward recognition camera based on related Data List items.
|
|
| Forward recognition camera | ||
| Combination meter assembly | ||
| Millimeter wave radar sensor assembly | ||
| "Front Camera Vision Blocked Clean and Demist Windshield" is displayed | Foreign matter attached to forward recognition camera or area of windshield glass in front of forward recognition camera | - |
| Forward recognition camera | ||
| Combination meter assembly | ||
| Millimeter wave radar sensor assembly | ||
| Although there is possibility of collision, pre-collision controls (all controls) do not operate ("Pre-collision System Unavailable" is not displayed) | Check if pre-collision system is canceled | - |
| Vehicle condition/environment does not match the pre-collision system operation conditions (Confirm control operation conditions) | ||
| Check installation condition of millimeter wave radar sensor assembly | ||
| Perform millimeter wave radar sensor assembly adjustment | ||
| Millimeter wave radar sensor assembly | ||
| Check installation condition of forward recognition camera | ||
| Perform forward recognition camera adjustment | ||
| Forward recognition camera | ||
| Although there is no possibility of collision, pre-collision controls (all controls) operate | Vehicle condition/environment does not match the pre-collision system operation conditions (Confirm control operation conditions) | |
| Check installation condition of millimeter wave radar sensor assembly | ||
| Perform millimeter wave radar sensor assembly adjustment | ||
| Millimeter wave radar sensor assembly | ||
| Check installation condition of forward recognition camera | ||
| Perform forward recognition camera adjustment | ||
| Forward recognition camera | ||
| Pre-collision system does not operate | Check if pre-collision system is canceled | - |
| ECU power source circuit | ||
| Millimeter wave radar sensor assembly | ||
| Pre-collision system cannot be canceled (PCS warning light does not illuminate) | Check steering pad switch assembly condition | - |
| Combination meter assembly (check if indicator illuminates using Active Test) | ||
| Millimeter wave radar sensor assembly | ||
| Combination meter assembly | ||
| Pre-collision system warning timing cannot be changed (warning timing setting screen not displayed on multi-information display) | Millimeter wave radar sensor assembly | |
| Combination meter assembly |
*1: If error code 7 is output during beam axis alignment, clear the DTCs and perform beam axis alignment again.