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Mercedes-Benz Key Fob Not Working

Mercedes-Benz key fob not working? The very first point you have to do is alter the keyless remote battery. We think you have actually currently done that part now. Is your Mercedes key fob not working after a battery modification? This post will aid you repair issues where the Mercedes key fob does not work or no longer unlock/locks doors or trunk. Most of the times, the key could start the automobile yet not function as a keyless entry remote. Generally talking, when Mercedes key fob is not working, it's due to the fact that either due to the fact that the key is defective or the All Activity Module (AAM) is not recognizing the key signal, or it is not receiving signal due to an antenna problem.

Mercedes-Benz Key Fob Not Working

You place the type in the ignition of your Mercedes-Benz, however absolutely nothing takes place. You can not transform the key. You can't start the cars and truck. The major reaon why this happens is a dead battery, but it can additionally be a number of various other problems which we have actually described below. As you insert the Smart Key remote into the Electronic Ignition Switch Over( EIS) control component (N73), power is provided to the key by the induction coil ring located in the EIS. Data is then traded with the infrared transmitter to confirm the Drive Consent. This post discusses the primary reasons that the key will not kip down the ignition and also possible remedy.

If you need a substitute battery note that Mercedes-Benz uses CR2025 battery kind.

  • Common Mercedes Key Fob Troubles
  • Mercedes key fob not working after battery modification
  • Mercedes remote does not function anymore
  • Keyless remote doesn't lock/unlock the auto
  • Mercedes key fob won't open doors
  • Panic switch doesn't work
  • Trunk unlock doesn't function


Action 1: Inspect Remote

Ensure you have new batteries in your key fob. Next, look very carefully at your Mercedes-Benz key. When you push the button on your key you need to see a tiny RED led light. The light must illuminate every single time you push any one of the switches (Lock, Unlock, Panic, Trunk).

Action 2: Inspect Infra-red signal using your phone

Next off, we need to inspect if the remote is sending out a message. The remote gives off infrared waves. While you cannot see infrared light with your eyes, there is a very easy method to examine. Grab your phone as well as switch on the electronic camera. Factor the electronic camera to your phone as well as very carefully see if you discover a light each time you transform you push a switch on the remote.

If you do not see infrared light, then you have a defective key.

If you see the infrared light, then the problem is in other places so continuously the following action.

View the following video to find out the best ways to examine if Mercedes key fob is working properly.


Step 3: Check Central Securing Fuse

Remove the metal key from the keyfob as well as utilize it to manually open the doors. Next off, you should inspect the fuse for the central locking circuit. Not just that however also check out the fuse for the Antenna Component and AAM. Since your MB gets the lock/ unlock signal by means of the antennas set up on your automobile, a poor antenna module fuse can likewise cause Mercedes key fob to quit working. Depending upon the MEGABYTES course, this fuse can be located in among the fuse boxes situated in the engine bay, side of dashboard, under back seat or trunk. If you locate a blown fuse replace it. Constantly replace blown integrates with the same ampere ranking fuse. Do not utilize a higher ampere score than exactly what is advised.

Step 4: Program/ Integrate Remote

To synchronize a Mercedes-Benz key to your auto all you should do is insert the key into the ignition for a couple of secs. This operates in a lot of situations however from time to time you could should follow additional guidelines to integrate your Mercedes key fob remote with your cars and truck. Even the brand-new secrets that are purchased from the dealer must operate properly when you insert them right into the ignition.

There are a few cases when you need to configure your key fob remote to your Mercedes-Benz. Listed below you will certainly discover basic guidelines on how you can synchronize a Mercedes key fob. For design details guideline inspect your owner's handbook.

Guidelines on how to sync Mercedes remote:

  • Insert the key into the ignition.
  • Quickly get rid of key from ignition and within 10 seconds hold down the lock button.
  • Proceed holding the lock switch, and at the very same time press, the unlock switch 5 times.
  • Following release all buttons as well as press the gate/trunk switch once.
  • Your Mercedes remote needs to be synchronized. Test to see if lock/ unlock features are working.

Tip 5: Identify All Activity Component (AAM).

The last action is to identify the AAM component. Currently, this is where this repair service could obtain pricey due to the fact that you either have to go to a mechanic or acquisition diagnostic scanners. You will have to start by checking out the mistake codes from the AAM module. You could achieve this utilizing a diagnostic scanner such as iCarsoft MB II. Ideally, you will certainly be able to pinpoint the problem and also fix it yourself. If the AAM module is malfunctioning or any programming is needed the iCarsoft MB II scanner will not be much aid apart from simply checking out and getting rid of codes. You will either should take your MB to a shop that has MB Star Diagnostic Scanner or has a sophisticated scanner such as Autel Maxidas or SnapOn Solus.

See Also: How Much Does a Mercedes-Benz Replacement Key Cost

They key itself could be the reason why the car does not begin. The key may open the doors, yet it will not begin the automobile. Sometimes, the transponder coil cables could disconnect and have to be resoldered or the cpu in the key could be malfunctioning. The easiest solution, in this instance would certainly be to purchase a new key from the Mercedes-Benz dealership.

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