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.
| Symptom | Suspected Area | Link |
|---|---|---|
| System does not operate at all | Proceed to "Clearance Warning ECU Power Source Circuit" | |
| Back sonar or clearance sonar switch assembly indicator does not come on | Back sonar or clearance sonar switch assembly | |
| Harness or connector | - | |
| Back sonar or clearance sonar switch assembly indicator comes on, but detection function does not operate (No. 1 clearance warning buzzer sounds) | Proceed to "Reverse Signal Circuit" | |
| Proceed to "Back Sonar Sensor Circuit" | ||
| Proceed to "Clearance Warning ECU Power Source Circuit" | ||
| No. 1 clearance warning buzzer continues to sound indicating a malfunction while the system is on | Proceed to "PRECAUTION" | |
| Proceed to "Back Sonar Sensor Circuit" | ||
| Proceed to "Clearance Warning Buzzer Circuit" | ||
| System operates with shift lever not in R, or does not operate with shift lever in R | Proceed to "Reverse Signal Circuit" | |
| Clearance warning ECU assembly | ||
| System cannot be turned off | Proceed to "Clearance Warning ECU Power Source Circuit" | |
| Even when taillights are turned on, back sonar or clearance sonar switch assembly illumination does not illuminate | Proceed to "Illumination Circuit" |