How to Open Your 2012 Mercedes-Benz S400 Key Fob and Change Battery

How to Open Your 2012 Mercedes-Benz S400 Key Fob and Change Battery

Remote key fob grant access to your S400. Once the key fob battery is dead or weak you will lose your keyless entry fob's ability to use remote functions. It's not difficult to replace the battery in your key fob by yourself. All you need is outlined in this article.

What type battery key fob use

Before beginning disassembly keyless entry remote check all that you need: flat head screwdriver and CR2025 batteries.
  • flat head screwdriver
  • 2xCR2025 batteries

Simple steps to change the battery in your car's key fob

A small coin battery installed in the your remote key fob. Remove any internal key before you try to pry apart the key fob.

Gently try to pry apart your keyless entry remote with flat head screwdriver. Change two CR2025 batteries with flat head screwdriver.

Now it's time to install new batteries inside keyless entry fob's case. Be sure to connect the battery the right way around in a circuit. Your key fob will not work if you place battery wrong way.

Before assembling fob’s case, check that all is functioning by testing buttons on circuit board.

The last thing to do is put your cover back on fob. Delicately try to assemble the two halves in place by hands from top to bottom. If your remote key fob case tightly closed, we done. If not, repeat the last step.

Key Fob Battery Replacement 2012 Mercedes-Benz S400 Video

Mercedes Benz Key Battery Change Replacement

Still not working? Buy new one

Frequently Asked Questions

Key fob of Mercedes-Benz S400 require 2xCR2025 batteries. Price for CR2025 batteries are under $6 build upon the size packaging, brand and type you buy. Take your old battery to the store, to find a proper replacement.

Remote key fob in most of cases do not need to be reprogrammed after battery replace. If your keyless entry remote not working, recheck new battery voltage. If it is not help, read user's manual or contact local dealer.

Changing your key fob battery is simple to do in 2012 Mercedes-Benz S400. Most of car manufacturers think about customers and make a special hole for key fob disassembly.

The price to change the battery inside key is $50-600 depending on the brand and the service pricing.

Remote key fob batteries in Mercedes-Benz S400 should be replaced every 4 years, but this will differ based on usage and build quality. If your keyless entry remote shortened signal strength, you should replace batteries before it stop working and make trouble for you.

If your Mercedes-Benz signal strength reduced, need multiple clicks to unlock or lock doors, key fob buttons not working or fob's battery more than 4 years old, in most cases battery change inside remote key fob needed. Current battery is dead with a high probability, but if it's not fix, remote key fob change or repair required.
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Fob Compatibility:

  1. FCC ID: IYZ3317
  2. Models: 2010-2012 Mercedes-Benz S400