What causes the Toyota C-HR's reverse radar to have no sound?
2 Answers
If there is a display but no sound, it is usually caused by damage to the reverse radar. If there is neither display nor sound, it is generally due to a wiring fault. Below is relevant information: 1. Principle of the reverse radar: The reverse radar emits ultrasonic waves through ultrasonic sensors, and the waves reflect back after hitting an obstacle. The ultrasonic sensor then receives the reflected waves, and the controller calculates the distance between the vehicle and the obstacle based on the time taken for the ultrasonic waves to be emitted and returned. Finally, the buzzer emits a rapid alarm sound to alert the driver. 2. Main functions of the reverse radar: Accurately measures the distance between the rear of the vehicle and the nearest obstacle; when reversing to the limit distance, it emits a rapid warning sound to remind the driver to brake; it can repeatedly emit a voice warning to alert pedestrians.
I also encountered the issue of no sound from the reverse radar when driving my Toyota C-HR, which really threw me off. Possible causes include the sensors being covered by mud or snow, preventing obstacle detection and thus no alert sound; or a blown fuse, which can be checked in the fuse box under the hood; it could also be that the volume setting was accidentally turned down or off—check the radar option in the vehicle settings menu via the center console screen. Loose wiring is another common culprit, especially after prolonged bumpy rides when connectors might come loose; control module failure is rare but requires a visit to the repair shop for diagnosis if it occurs. It's advisable to first clean the sensor surfaces and restart the vehicle; if that doesn’t work, get it repaired promptly to avoid accidents while reversing. Regularly cleaning around the radar during car washes can prevent this issue—it’s a real lifesaver, so don’t overlook these small details.
