How to Open Your 2004 Mercedes-Benz E320 Key Fob & Change Battery

How to Open Your 2004 Mercedes-Benz E320 Key Fob & Change Battery

Keyless entry remote grant easy access to your E320. Once the key fob battery is dead or weak you will lose your keyless entry fob's ability to control remote functions. Below, we are going to tell you how to disassembly Mercedes-Benz remote key fob and replace a weak battery yourself. If you decide to do it at home near E320, follow our instruction, but first make sure you have tools and materials required.

What is the battery key fob use

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

Step by step instruction

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

Carefully try to pry apart your key fob with hands or flat head screwdriver. Replace 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 will not work if you put 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.

The last thing to do is put your cover back on fob. Carefully try to assemble the pieces together by hands from top to bottom. Inspect your remote key fob shell for gaps. If it is not tightly closed try to repeat last step.

Video of remote key fob opening

Mercedes Benz Key Fob Case Change and Battery Replacement Remote

Still not working? Buy new one


Key fob of Mercedes-Benz E320 require 2xCR2025 batteries. Price for CR2025 batteries are under $4-6 depending on the size packaging, type and brand you buy. You can take old battery to the store, with you to find a proper replacement.

Usually, after remote key fob battery replace, you do not need to reprogram. Keyless entry remote reprogramming procedure often described in user's manual of your vehicle.

Yes, you can replace battery in your 2004 Mercedes-Benz E320 keyless entry remote yourself. Most hard part is to open keyless entry fob's case. It's pretty simple with our step by step guide.

Dealer service cost for change the battery in key fob is from $30 to as high as $500 depending on the make.

Key fob batteries in modern cars should be replaced once in three years, although this will vary based on frequency of use and quality. If your keyless entry remote shortened signal strength, you should replace batteries before it stop close doors and make problems for you.

If your car signal strength reduced, fob's battery more than 4 years old, key fob buttons not working or has low key battery indicator on dashboard, in most cases battery change inside keyless entry remote needed. Currently installed battery is weak or dead with a high probability, but if it's not fix problem, key change or repair needed.
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Fob Compatibility:

  2. Models: 1998-2006 Mercedes-Benz E320