Will the Mercedes-Benz GLC's mirror warning light beep when illuminated?
4 Answers
The Mercedes-Benz GLC's mirror warning light does not beep when illuminated. Power supply inspection of the anti-theft main unit: Use a multimeter to test the power supply line of the anti-theft main unit. There should be 12V voltage. If normal, check whether the fuse of the anti-theft main unit and related circuits have open or short circuits. Fault. Anti-theft main unit relay inspection: When pressing the remote control, the anti-theft main unit relay should make a "click" sound. Otherwise, it indicates that the main unit relay is damaged and the anti-theft main unit should be replaced. Alarm horn inspection: Directly connect the power supply terminal of the alarm horn to the positive and negative terminals of the battery. If the horn sounds, it means the horn is normal. Otherwise, the alarm horn should be replaced.
I often drive my friend's Mercedes-Benz GLC, and the small yellow light on the side mirror does indeed beep when it lights up. When there's a vehicle in the blind spot, the triangular indicator on the mirror first lights up yellow as a warning. If you then activate the turn signal to change lanes, the car immediately emits a beeping alarm sound. Last week on the highway, I encountered this—the yellow light on the mirror flashed, but I didn’t notice it. As soon as I signaled to change lanes, the alarm sounded extremely sharp, startling me into straightening the steering wheel immediately. This design is quite reasonable, using sound to forcefully alert the driver, which is much more effective than just flashing lights. That’s how Mercedes-Benz’s Blind Spot Assist system works—it triggers a beep only when it detects a dangerous maneuver, not just when the light comes on.
I've driven quite a few Mercedes-Benz cars, and the GLC's mirror warning system is very intelligent. The light is just the first level of alert, indicating there's a vehicle approaching from the side or rear. The real warning sound comes when you activate the turn signal to change lanes, and the system predicts a collision risk—it then emits a beeping sound. This sound isn't continuous; it beeps two or three times to alert you. Last time I was driving in the rain, and the rearview mirror was blurred by rainwater—it was this warning sound that helped me avoid an accident. Mercedes' system only activates above 30km/h, so it doesn't give false alarms in city traffic jams.
As a veteran driver with ten years of experience, I'm very familiar with the blind spot monitoring system in the Mercedes-Benz GLC. The mirror light comes on without a sound, and it only alerts when two conditions are met simultaneously: first, a vehicle is detected in the blind spot, and second, the driver activates the turn signal. The alert sound is designed with precision. Like the last time I was changing lanes with my family in the car, the two beeping sounds made everyone alert. The system can actually be customized—you can turn the alert sound on or off in the vehicle settings, but it's recommended to keep it on as it can be a lifesaver in critical moments.
