How to Open Your 2012 Mercedes-Benz S350 Key Fob and Change Battery

How to Open Your 2012 Mercedes-Benz S350 Key Fob and Change Battery

Key fob grant easy access to your car. If the keyless entry remote battery is dead you’ll not to be able close doors from distance. It's not difficult to change the battery in your key fob, and it’s easier than you think. Everything you need is explained in this post.

What is the battery key fob require

Replacing batteries in key fob require 2 CR2025 batteries and flat head screwdriver. Prepare these materials and tools before opening and make sure to match the type of your fob’s batteries.
  • 2xCR2025 batteries
  • flat head screwdriver

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

A tiny coin battery installed inside the your remote key fob. Move the key out of the way if it is in the keyless entry remote.

Delicately try to pry apart your fob with flat head screwdriver. Remove two CR2025 batteries with flat head screwdriver.

Change old batteries with new one CR2025. Battery must be installed with the same position as was an old. Your keyless entry remote will not work if you mistakenly place battery wrong way.

After the new batteries installed, check remote key fob functionality by pressing buttons. If everything is functioning, assemble your fob’s body in reverse order.

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

Key Fob Battery Replacement 2012 Mercedes-Benz S350 Video

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

Still not working? Buy new one


Remote key fob of Mercedes-Benz S350 use 2xCR2025 batteries. Price for CR2025 batteries are under $4-6 depending on the type, size packaging and brand you buy. Take your old battery to the store, to be sure.

Key fob in most of cases reprogramming not needed after battery replace. If your keyless entry remote not working, recheck new battery voltage. Otherwise, read user's manual or contact local dealer.

Yes, you can change battery in your 2012 Mercedes-Benz S350 key yourself. Most difficult part is to disassembly keyless entry fob's case. It's pretty easy with our guide.

The cost to change the battery in key fob is in range from $30 to as high as $500 depending on the make and the service station.

You should change batteries inside keyless entry remote of Mercedes-Benz S350 at least once in 3-4 years. The lifetime of battery differ on usage time, quality and operating conditions.

These signs will warning you that it's probably time to change battery in your 2012 Mercedes-Benz S350: signal strength reduced, low key battery indicator on dashboard, you didn't change battery more than 4 years and multiple clicks to unlock or lock doors required.
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Other Mercedes-Benz Models:

Fob Compatibility:

  1. FCC ID: IYZ3317
  2. Models: 2012 Mercedes-Benz S350