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What is the issue when PRE-SAFE stops functioning?

2 Answers

DelLondon

09/02/25 5:49am

Normally, when PRE-SAFE stops functioning, it does not affect the vehicle's operation. Here is an introduction to the relevant content: 1. Restart: In most cases, the driver can restore normal operation by turning off the engine and restarting it. 2. Sensor malfunction: If the restart does not work, it may be due to a sensor malfunction. It is recommended to take the vehicle to a 4S shop for inspection and check if the car radar needs cleaning. 3. Camera damage: The camera sensor may be damaged during car washing. Additionally, if a Mercedes-Benz displays PRE-SAFE stop functioning, it could be due to the vehicle's safety protection equipment being turned off, specifically the passenger airbag switch being deactivated. The owner can go to a service station for assistance or manually turn on the passenger airbag, with the switch located on the passenger side.

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StTanner

09/14/25 7:57am

Last time I was driving, the Presafe system suddenly stopped working, which made me quite nervous because it's a critical safety feature. Fortunately, I later took it to the repair shop to diagnose the issue. The main culprit could be battery-related—insufficient charge or an aging battery can cause electronic systems, including Presafe, to malfunction since it relies on electricity to trigger seat and window adjustments. Sensor failures are also common; radar sensors behind the windshield may get blocked by dust or insects, leading to misjudgments—I once experienced blurred sensors after rain. Sometimes, the system software acts up and requires an update or reset. While this sounds simple, it's best left to technicians to avoid worsening the issue. A Presafe failure is no minor matter—it compromises pre-collision protection mechanisms—so prompt checks via diagnostic ports or professional servicing are crucial upon detection. Regular maintenance of the vehicle's electronic components is vital; otherwise, other safety features may also fail, given how modern cars rely on interconnected electronic systems to ensure safe driving.

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