2010 Mercedes-Benz S400 Key Fob Battery Replacement Guide

2010 Mercedes-Benz S400 Key Fob Battery Replacement Guide

Keyless entry remote allow easy access to your Mercedes-Benz. When the keyless entry remote battery is weak or dead you will not to be able unlock trunk or doors remotely. In this case, you’ll benefit from knowing how to open your car keyless entry remote and replace a weak battery yourself. If you choose to do it at home near S400, use this guide, but don't forget to check everything you need before you start.

What is the battery key fob require

Before beginning disassembly remote key fob be sure that you have all required tools and materials: flat head screwdriver and two CR2025 batteries.
  • 2xCR2025 batteries
  • flat head screwdriver

Step by step guide

Inside of your remote key fob installed small button battery. Remove any internal key before you try to pry apart the remote key fob.

Gently try to disassemble your keyless entry remote with flat head screwdriver. Remove 2xCR2025 batteries with flat head screwdriver.

Now it's time to install new batteries in fob’s case. Every battery has a negative and positive side and if you put the wrong connector down, the charge cannot go into your circuit board and make it work. Check polarity on battery, by "+" mark.

Before assembling fob’s case, verify that all functions works by testing buttons on keyless entry remote.

At this point squeeze keyless entry fob's back cover together. Line your body two halves together and assemble it together by hands from top to bottom. Check your key shell for gaps. If it is not firmly closed try to repeat last step.

Key Fob Battery Replacement 2010 Mercedes-Benz S400 Video

SOLVED - Mercedes Benz Keyfob Battery Replacement | Smart Key Fob Dead Batteries

Still not working? Buy new one


Remote key fob of Mercedes-Benz S400 require 2xCR2025 batteries. Most CR2025 batteries are under $4-6 build upon the size packaging, type and brand you buy. You can take old battery to the store, with you to find a proper replacement.

Key fob in most of cases reprogramming not needed after battery replace. If your key fob not working, recheck new battery voltage. If it is not help, read user's manual or contact local dealer.

Replacing your key fob battery is easy to do in 2010 Mercedes-Benz S400. Most of car manufacturers think about customers and make a special hole for keyless entry remote disassembly.

Car service pricing for change the battery in keyless entry remote is from 50 to 600 dollars depending on the make.

Key fob batteries in Mercedes-Benz S400 should be changed once in 3-4 years, also this will vary based on usage and build quality. If your remote key fob reduced signal strength, you should replace batteries before it stop open doors and make trouble for you.

These signs will warn you that it's perhaps time to change battery in your 2010 Mercedes-Benz S400: multiple clicks to unlock or lock doors required, you didn't change battery more than 4 years, signal strength reduced and low key battery indicator on dashboard.
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Fob Compatibility:

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