What causes a Mercedes Benz key fob to not work?
Key Problems: If your Mercedes’ key fob has a dead (or dying) battery, it may not communicate properly with the Electrical Ignition System (EIS). If your model has an IR-equipped key fob, it may need to be reset (see below) to communicate properly.
Where is the ignition key on a Mercedes Benz?
There are 4 electronic and/or mechanical modules that are synchronized for everything to work ok: 1. The key (electronic key); 2. The electronic ignition switch (eis, the place where you put your key in); 3. steering locker; 4 the central electronic circuit module.
How do you unlock a Mercedes C class?
Insert the key and turn it to the “ON” position, then press and release the lock button on the key. Press and hold the remote’s unlock button. In 1-2 seconds, press the remote’s lock button five times in a row while holding the unlock button.
What to do if your car key won’t turn?
If you can’t even turn your car’s key to the “start” position, you can be certain that the problem is either the electrical system or the key itself. If you have backup ignition keys, give them a try. You’ll have to get a dealer to help you with a key that isn’t recognized by the EIS.
Why is my Mercedes C class key not working?
The main symptoms are the key won’t unlock the doors or start the car. You may see a blinking red light when you press a button. Insert the key and turn it to the “ON” position, then press and release the lock button on the key. Press and hold the remote’s unlock button.
What are the common problems with Mercedes key fobs?
Common Mercedes Key Fob Problems Go to top 1 Mercedes key fob not working after battery change 2 Mercedes remote doesn’t work anymore 3 Keyless remote doesn’t lock/unlock the car 4 Mercedes key fob won’t unlock doors 5 Panic button doesn’t work 6 Trunk unlock doesn’t work
What kind of key does a Mercedes Benz use?
While most Mercedes-Benz cars have the SmartKey some models such as the ML Class, SLK Class, Crossfire used a metal blade key up to 2005. Some models suffer from the defective key tumbler. We have seen cars with as little as 20,000 miles where the tumbler go bad. Make sure the steering wheel is not in a locked position as mentioned above.
Why is my key fob on my W204 not working?
Here’s a look at some common reasons why your w204’s key fob isn’t working. Some owners report an error message, such as “key not detected,” or limited range when the key batteries are dead or very low. Fortunately, changing the key battery is simple and can be accomplished by using the valet key that comes included with the fob.
Why does my Mercedes not start when I Turn on the ignition?
Despite this brand’s high quality, though, Mercedes’ can develop problems with or without regular car maintenance. There are a few theories about why your Mercedes refuses to start when you switch the key in the ignition.
Why is my Mercedes Benz EIS not working?
If your model has an IR-equipped key fob, it may need to be reset (see below) to communicate properly. EIS Problems: If the ignition system itself is to blame, it may have intentionally locked down your car’s engine to prevent theft. This can happen if the EIS is damaged or if it does not recognize your key as valid.
Why does the key not turn when inserted in the ignition?
The EIS module could also be the reason that the key does not turn when inserted in the ignition. Many car owners complain that the car starts fine on a warm or hot day but in cold days the car will not start. This may sound strange, but it is reported frequently.
Why are my Mercedes Benz ignition keys not working?
Some of the Mercedes Benz ignition key problems are caused by a defective key, a dead or dying battery, failed Electronic Ignition Switch or EIS, faulty shifter module, or a bad steering wheel module. Mercedes Benz ignition key problems may include key not turning in on ignition, car not starting, and issues in inserting and removing keys.
Why does my Mercedes Benz not turn on?
One of the most common Mercedes Benz ignition key problems that its drivers experience is a key that won’t turn in on ignition. This Mercedes Benz ignition key problem can be caused by the three main reasons – problems with the vehicle’s key itself, problems with other related components, and issues with the ignition lock cylinder.
If your model has an IR-equipped key fob, it may need to be reset (see below) to communicate properly. EIS Problems: If the ignition system itself is to blame, it may have intentionally locked down your car’s engine to prevent theft. This can happen if the EIS is damaged or if it does not recognize your key as valid.
When does the Mercedes ignition key stop working?
Mercedes-Benz key works intermittently. Key works properly when it is warm. When it is cold or the temperature drops below 20 degrees Celcius it stops working. Key doesn’t start the car when cold. Key and ignition work properly all day when it is warm.
Why does the Mercedes ignition work intermittently?
Mercedes-Benz key works intermittently. Key works properly when it is warm. When it is cold or the temperature drops below 20 degrees Celcius it stops working. Key doesn’t start the car when cold. Key and ignition work properly all day when it is warm. These symptoms are often caused by weak joints on the EIS (Electronic Ignition System).
Why is the ignition key on my Mercedes not working?
Over time, keys themselves can also become worn out, and you may need to order a replacement key. Key fobs and ignition keys may not work at remote distances when they begin to malfunction. Again, this could be due to a loss of battery life in the ignition key or a need for reprogramming.
Are there any electrical problems with a Mercedes Benz?
Recently we have been working on a Mercedes-Benz with some major and unexplainable electrical issues. The problem started with the Keyless Go feature. The key would unlock the car via keyfob and start it by inserting the key in the ignition. But Keyless Go stopped working.