What to Do When the Radar on Sagitar Keeps Beeping and the Switch Flashes?
3 Answers
Debris stuck on the reverse radar probe, causing signal blockage; Solution: Check if there are any obstructions covering the radar holes at the rear of the vehicle. Leakage or seepage from the rear wiper hose into the reverse radar system; Solution: Seal the leak point and drain any accumulated water from the radar system. Error in the radar ultrasonic signal; Solution: Restart the engine, drive the vehicle to an open area, and attempt reversing again to observe the effect. Short circuit in the reverse radar wiring or malfunction in the radar module. Solution: Visit a 4S shop or repair shop for inspection, check the wiring, or replace the radar module.
I've been driving for over a decade and have encountered quite a few situations where the radar keeps beeping and flashing. Most of the time, it's an issue with the radar sensors on the rear bumper—either they're covered in mud or the wiring harness connectors have come loose. I suggest you turn off the engine, wait a few minutes, and then restart it to let the system perform a self-check again. After parking, use a soft cloth to carefully clean the front and rear sensors, especially after rain when water droplets tend to accumulate. Next, check if the radar module connector inside the side panel of the trunk is loose. If that doesn’t work, you’ll need to inspect the corresponding fuse in the fuse box to see if it’s blown. Remember to bring a flat-head screwdriver—locate the fuse marked with a 'P' in the lower left corner of the driver’s seat and pull it out to check. If none of these checks help, it’s definitely the radar module that’s failed, and you’ll need to visit a 4S shop for a computer diagnosis and replacement. Constant beeping isn’t just annoying—it also makes it hard to judge the safe distance when reversing.
My friend's Volkswagen had the same issue—his car's radar kept giving false alarms after rain. First, check if the sensor surfaces are dirty. Carefully clean the circular sensors on the front and rear bumpers with a wet wipe. If the warning light still flashes after cleaning, it might be due to a short circuit or water ingress in the module. Also, inspect the radar control unit inside the right side of the trunk lining to see if any luggage is pressing against the wiring harness. As a temporary fix, you can press and hold the radar button on the center console for 5 seconds to force it off, but this will disable the parking beeps next time you reverse, which isn’t very safe. It’s best to visit a repair shop over the weekend and have a mechanic test the circuit with a multimeter. Replacing a single faulty sensor costs around a hundred bucks, while replacing the entire module could run several hundred. Remember, don’t unplug any connectors while the vehicle is powered on, as it could damage the onboard computer.
