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What to do when the Mercedes radar 'off' red light is on and cannot be turned off?

3 Answers
DiEmilio
09/07/25 3:13am
Mercedes radar 'off' red light is on and cannot be turned off because the radar has a malfunction and needs repair. The following is an introduction to Mercedes: 1. Positioning: Mercedes-Benz, a German automobile brand, is one of the premium automobile brands, renowned for its perfect technical level, high-quality standards, innovative capabilities, and a series of classic coupe models. 2. Vehicle lineup: Since the rise of multi-purpose business vehicles in the 1980s, major global manufacturers have been striving to produce their latest MPVs to meet global business needs. In the past 10 years, China's business vehicle market has developed rapidly, from the early 'bullet head' to the now ubiquitous GL8. The rapid growth of Chinese enterprises has driven the vigorous expansion of the business vehicle market, especially with high-end MPVs leading the development of the MPV market with new technologies, high quality, high safety, more diverse functions, and advanced design concepts.
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EmilyRose
09/19/25 2:44am
My Mercedes-Benz encountered a situation where the radar 'OFF' warning light turned red and couldn't be turned off, with several possible causes. First, the sensors might be dirty. The radar sensors on a Mercedes are usually located around the front grille and can easily get covered by mud, snow, or insects, blocking the signal. From personal experience, carefully wiping the lens after parking, cleaning it thoroughly with a soft towel, and restarting the vehicle several times can sometimes resolve the issue. Another factor could be a software glitch or loose wiring connections triggering false alarms, which may require a hard reset: open the hood, disconnect the engine compartment fuse box or negative battery cable for a few minutes, then reconnect to reset the system. However, after a power reset, Mercedes may restore default settings like seat memory, so it's advisable to back up the dashboard display before proceeding. If the red light persists, it could indicate hardware issues such as a faulty sensor or control module problem, necessitating a visit to a 4S dealership to read the fault codes with a diagnostic tool for a thorough fix. This concerns parking safety, so don't delay too long. Regular maintenance, including periodic cleaning of the sensors, can prevent such troubles and ensure peace of mind while driving.
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LaKinsley
11/02/25 3:05am
The Mercedes radar 'OFF' red light staying on is indeed a high risk, as I've personally experienced. Radar system failure interrupts automatic parking and collision warning functions, which can easily lead to accidents. Immediate action is recommended. First step: Park in a safe location and check if there's obvious dirt blocking the sensors. Clean them thoroughly and restart the vehicle several times to see if the light turns off. If ineffective, try a soft reset method: Turn off the ignition, wait a minute or two, then restart. However, newer Mercedes models may require menu operations—manually turn off the radar in the settings before restarting the relevant buttons. If the red light persists, avoid DIY solutions like disconnecting the battery for a reset, as non-professional operations may cause additional system errors. Prioritize seeking help from authorized dealers. Their specialized tools can quickly scan and identify faults, often pinpointing issues like circuit shorts or component aging, with costs typically around a thousand yuan. Regularly maintain the sensor area to avoid collisions and prolong its lifespan.
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