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.
When an open circuit indication is displayed by the self-check function, check for DTCs and troubleshoot according to each inspection procedure.
| Symptom | Suspected Area | Link |
|---|---|---|
| System does not operate at all | Proceed to "Clearance Warning ECU Power Source Circuit" | |
| CAN communication system | ||
| Clearance warning ECU assembly | ||
| System cannot be turned off | CAN communication system | |
| Clearance warning ECU assembly | ||
| When there are no obstacles, the system operates. | Make sure that no accessories (license plate holders, etc.) are installed in the vicinity of the sensor. | - |
| CAN communication system | ||
| Front ultrasonic sensor | ||
| Rear ultrasonic sensor |
| Symptom | Suspected Area | Link |
|---|---|---|
| Sensor frozen indication (dirty or frozen) | Proceed to "Sensor Frozen Indication (Dirty or Frozen)" | |
| Combination meter assembly (brake warning) operates normally, but detection does not operate when parking brake is released, or detection operates when parking brake is applied (front sonar) | CAN communication system | |
| Clearance warning ECU assembly | ||
| Detection operates when shift lever is in any position other than R, or does not operate with shift lever in R (rear sonar) | Can communication system | |
| Clearance warning ECU assembly | ||
| Combination meter assembly (shift selection) operates normally, but detection operates when shift lever is in P, or detection does not operate when shift lever is in any position other than P (front sonar) | CAN communication system | |
| Clearance warning ECU assembly | ||
| Combination meter assembly (shift selection) operates normally, but detection operates when shift lever is in any position other than R, or does not operate with shift lever in R (rear sonar) | CAN communication system | |
| Clearance warning ECU assembly | ||
| Combination meter assembly (speedometer) operates normally, but detection does not operate when vehicle speed satisfies operation condition, or detection operates when vehicle speed does not satisfy operation condition (front sonar) | CAN communication system | |
| Clearance warning ECU assembly |
| Symptom | Suspected Area | Link |
|---|---|---|
| Sonar detection operation is normal but buzzer operation is intermittent | Check that the temporary mute function is not operating | - |
| Proceed to "Clearance Warning Buzzer Circuit" | ||
| Clearance warning ECU assembly |
| Symptom | Suspected Area | Link |
|---|---|---|
| Detection operation is normal but clearance sonar indicator does not illuminate | CAN communication system | |
| Combination meter assembly: Perform Active Test (Indicat. Clearance Sonar LCD) | ||
| Combination meter assembly | ||
| Clearance warning ECU assembly | ||
| Detection operation is normal but all sonar displays do not appear on multi-information display and multi-display | CAN communication system | |
| Clearance warning ECU assembly | ||
| Detection operation is normal but sonar displays do not appear on multi-information display | CAN communication system | |
| Combination meter assembly | ||
| Clearance warning ECU assembly |