How to Open Your 2009 Mercedes-Benz CLK350 Key Fob & Change Battery

How to Open Your 2009 Mercedes-Benz CLK350 Key Fob & Change Battery

If your auto remote key fob isn't unlock doors perfectly, the battery likely needs to be changed. In this post, we explained how to open Mercedes-Benz remote key fob and replace a weak battery DIY. If you decide to do it at home near CLK350, use this instruction, but first make sure you have all you need.

What kind of battery remote key fob require

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

Step by step guide

Inside of your key fob installed small button battery. Move the key out of the way if it is in the key fob.

Delicately try to disassemble your key with pry tools. Replace two CR2025 batteries with flat head screwdriver.

Get new batteries and install it in keyless entry fob's case. Battery must be placed with the same position as was an old. Your remote key fob will not work if you by mistake place battery wrong way.

When the new batteries installed, check remote key fob 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 shell pieces together and assemble it together by hands from top to bottom. Check your fob case for gaps. If it is not firmly closed try to repeat last step.

Video of keyless entry remote disassembly

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

Still not working? Buy new one


Keyless entry remote of Mercedes-Benz CLK350 require 2xCR2025 batteries. Price for CR2025 batteries are under $4-6 depending on the brand, size packaging and type you buy. You can take old battery to the store, to find a proper replacement.

Usually, after keyless entry remote battery change, you do not need to reprogram. Don't be scare of this procedure, because often it's described in user's manual.

Yes, you can replace battery in your 2009 Mercedes-Benz CLK350 keyless entry remote yourself. Most difficult part is to open keyless entry fob's case. It's pretty easy with our guide.

The price to replace the battery inside keyless entry remote is in range $50-600 depending on the make and the service pricing.

Key fob batteries in Mercedes-Benz CLK350 should be replaced every 4 years, although this will differ based on usage and quality. If your remote key fob reduced signal strength, you should change batteries before it stop working and make problems for you.

If your car need multiple clicks to unlock or lock doors, fob's battery more than 4 years old, signal strength reduced or has low key battery indicator on dashboard, it's probably battery replace in keyless entry remote needed. Installed battery is weak or dead with a high probability, but if it's not fix, key fob change or repair needed.
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Other Mercedes-Benz Models:

Fob Compatibility:

  1. FCC ID: KR55WK49031
  2. Models: 2006-2009 Mercedes-Benz CLK350