2012 Mercedes-Benz S550 Key Fob Battery Replacement Guide

2012 Mercedes-Benz S550 Key Fob Battery Replacement Guide

Keyless entry remote grant access to your auto. When the key battery is discharged you lose your fob’s ability to use distance opening function. In this article, we explained how to disassembly your keyless entry remote and replace your Mercedes-Benz key battery step by step.

What type battery keyless entry remote require

Before starting open key fob check all that you need: flat head screwdriver and CR2025 batteries.
  • flat head screwdriver
  • 2xCR2025 batteries

Step by step guide

A small coin cell battery installed inside the your key fob. Move the key out of the way if it is in the key fob.

Carefully try to disassemble your key fob with flat head screwdriver. Remove two CR2025 batteries with flat head screwdriver.

Replace old batteries with fresh one CR2025. Be sure to connect the battery the right way around in a circuit. Your remote key fob will not work if you connect battery wrong way.

After the new batteries installed, check remote key fob functionality by pressing buttons. If all functions works, assemble your fob’s case in reverse order.

At this point squeeze keyless entry fob's back cover together. Line your body pieces together and assemble it together by hands from top to bottom. If your keyless entry remote case tightly closed, we done. If not, repeat the last step.

How to replace the battery video instruction

Mercedes Benz Keyfob Battery Replacement SmartKey Keyless Easy to do

Still not working? Buy new one


Key fob of Mercedes-Benz S550 use 2xCR2025 batteries. Most CR2025 batteries are under $5 build upon the type, brand and size packaging you buy. You can take old battery to the store, to find a proper replacement.

Keyless entry remote in most of cases do not need to be reprogrammed after battery change. If your key not working, recheck new battery voltage. Otherwise, read user's manual or contact local dealer.

Yes, you can replace battery in your 2012 Mercedes-Benz S550 key yourself. Most hard part is to disassembly fob’s case. It's pretty simple with our step by step guide.

Car service pricing for change the battery in fob is from $30 to as high as $500 depending on the car.

You should replace batteries inside keyless entry remote of Mercedes-Benz S550 at least once in three years. The lifetime of battery differ on usage time, quality and operating conditions. Lithium cells normally will last longer.

These signs will alert you that it's probably time to replace battery in your 2012 Mercedes-Benz S550: signal strength reduced, multiple clicks to unlock or lock doors required, key fob buttons not working and you didn't change battery more than 4 years.
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Fob Compatibility:

  1. FCC ID: IYZ3317
  2. Models: 2007-2012 Mercedes-Benz S550