How to Replace the Battery in a 2012 Mercedes-Benz R350 Key Fob

How to Replace the Battery in a 2012 Mercedes-Benz R350 Key Fob

Key fob allow easy access to your car. When the remote key fob battery is dead or weak you will not to be able unlock doors from distance. In this case, you will benefit from knowing how to disassembly Mercedes-Benz key fob and change a dead battery yourself. If you gonna solve to do it at home near R350, use this guide, but first make sure you have all you need before you start.

What kind of battery keyless entry remote require

Before you start to open key fob be sure that you have all recommended tools and materials: flat head screwdriver and 2xCR2025 batteries.
  • 2xCR2025 batteries
  • flat head screwdriver

Simple steps to replace the battery in your R350's keyless entry remote

A button cell battery installed in the your keyless entry remote. Move the key out of the way if it is in the key fob.

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

Replace old batteries with new one CR2025. Every battery has a negative and positive side and if you put the wrong connector down, the current cannot go into your circuit board and make it work. Check polarity on battery, by "+" mark.

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

The last thing to do is put your cover back on fob. Delicately try to assemble the pieces together by hands from top to bottom. If your keyless entry remote shell tightly closed, we done. If not, repeat the last step.

Video of key fob opening

How To Replace A Mercedes R350 Class Key Fob Battery 2007 - 2012

Still not working? Buy new one


Key fob of Mercedes-Benz R350 use 2xCR2025 batteries. Price for CR2025 batteries are under $4 depending on 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 reprogramming not required after battery replace. If your remote key fob not working, recheck new battery voltage. If it is not help, read user's manual or contact local dealer.

Yes, you can change battery in your 2012 Mercedes-Benz R350 keyless entry remote yourself. Most difficult part is to open keyless entry fob's case. It's pretty easy with our instruction.

Auto repair shop's price for change the battery in fob is from 50 to 600 dollars depending on the make.

You should replace batteries inside key fob of modern cars at least once in three years. The lifetime of battery differ on frequency of use, quality and operating conditions.

If your car key fob buttons not working, has low key battery indicator on dashboard, fob's battery more than 4 years old or need multiple clicks to unlock or lock doors, in most cases battery change in key fob required. Currently installed battery is dead or weak with a high probability, but if it's not help, fob replace or repair required.
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Fob Compatibility:

  1. FCC ID: IYZ3317
  2. Models: 2007-2012 Mercedes-Benz R350