Why Mercedes SRS malfunction? When does SRS light on?

Why Mercedes SRS malfunction? It means that your airbag system is no longer working in times of emergency. In this article, we will find out about the error of the SRS warning light displayed on the dashboard and how to fix it. Let’s see the details below.

What is Mercedes SRS?

SRS (Supplemental Restraint System) is an additional system to increase the protection of passengers in the car. It is located in the airbag system on ​​Mercedes-Benz.
AirBag is an in-vehicle safety system consisting of inflatable bags in order to limit collisions between passengers and the car’s dashboard and other interior details to avoid injury to them.


So how does this system work and why does the Mercedes SRS malfunction?

Structure and working principle of SRS system

The structure of the car airbag: The car airbag system is made up of 3 main parts: the sensor system, the airbag and the detonator of the vehicle.

  • The sensor system works when a collision occurs, it will activate the airbag to deploy and help protect the driver and occupants.
  • The detonator has the function of inflating the airbag in the event of a collision
  • Airbags are designed from stretchy fabric capable of deploying in a quick period of time, especially in the event of a collision to protect occupants and limit injuries.

Working principle of Mercedes SRS malfunction
When a collision occurs, the sensor system will work first to transmit a signal to the airbag controller, the detonator will quickly inflate the airbag. The airbag will then deploy quickly.

Some notes when using air bags
The airbag system will help the occupants of the car to limit injuries in the event of a collision, but there are also some notes for users as follows:

  • Do not place objects on the surface of the airbag: In the event of a collision, the airbag will inflate very quickly with great speed, so when placing objects on top, the inertia will fly away, which can cause damage to the occupants. there.
  • Always sit and drive with the correct posture: This is one of the recommendations for drivers to drive safely, correct sitting posture is very important because in the event of a collision, the bag when inflated quickly can cause damage to the vehicle. parts of your body due to the strong force of the airbag deployment.
  • Do not touch the inside of the airbag after it has inflated as the high temperature can lead to burns

Some problems that Mercedes SRS malfunction

The Mercedes SRS malfunction that appears will make it easy for the driver to lose focus during driving, so it will not be safe. You need to understand the cause and problem of this warning. Here are some common problems with this system:

  • Airbag sensor not working
  • Expired air bags
  • Airbags deploy on their own in the absence of a collision
  • The airbag warning light on the dashboard lights up continuously


What does the Mercedes SRS light meaning?

Every time we start the car, the Supplemental Restraint System will check a series of following components:

  • Airbag
  • Airbag control unit 
  • Faulty sensor
  • Detonator
  • Seatbelt force limiter

There are many reasons why the SRS/Airbag warning light turns on on the Mercedes SRS system, however there are some common errors as follows:

  • Seat Occupancy Senor error appears in the passenger seat.
  • Low voltage can be caused by the battery or charging in the electrical system.
  • The seat belt sensor has a problem
  • Airbag is defective
  • The collision sensor is faulty, appears damaged or loose.

So when the Mercedes SRS malfunction, possibly because one of the above components is at fault.

How to turn off srs light Mercedes, you can refer to the cause and how to fix it in the article How to coding SRS Airbags Warning Mercedes W164 (2007) on our website.

First of all, you need specialized coding software for Mercedes such as Vediamo or DTS Monaco and especially the C4 device to connect the software on the computer with the car.
Are you looking for a dedicated laptop for automotive repair? Contact us right here!

If the dashboard still shows a Mercedes SRS malfunction warning light after fixing, you may make mistake at some steps. The best way is to contact our technicians to quickly review and correct the mistake to avoid bad consequences. You can contact us directly via website or WhatsApp: +13155472355. We will assist you to solve the problem as quickly as possible.

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