How to Open Your 2003 Mercedes-Benz S500 Key Fob & Change Battery

How to Open Your 2003 Mercedes-Benz S500 Key Fob & Change Battery

If your auto keyless entry remote is not open doors well, the battery surely must to be changed. In this post, we are going to tell you how to open your remote key fob and change a weak or dead battery DIY. If you choose to do it at home near S500, use this guide, but first make sure you have everything you need.

What type battery key fob use

Don't forget before disassembly key fob be sure that you have all recommended tools and materials: flat head screwdriver and two CR2025 batteries.
  • flat head screwdriver
  • 2xCR2025 batteries

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

A small button cell battery installed in the your remote key fob. Remove any internal key first, and then try to pry apart the remote key fob.

Delicately try to pry apart 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.

Before assembling fob’s case, check that all is functioning by pressing buttons on circuit board.

The last thing to do is put your cover back on fob. Carefully try to put the pieces together by hands from top to bottom. If your remote key fob case firmly closed, we done. If not, repeat the last step.

Key Fob Battery Replacement 2003 Mercedes-Benz S500 Video

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

Still not working? Buy new one


Key fob of Mercedes-Benz S500 use 2xCR2025 batteries. Most CR2025 batteries are under $6 depending on the size packaging, type and brand you buy. You can take old battery to the store, to find a proper replacement.

Keyless entry remote in most of cases do not require to be reprogrammed after battery replace. If your key fob not working, recheck new battery voltage. Otherwise, read user's manual or contact local dealer.

Yes, you can change battery in your 2003 Mercedes-Benz S500 remote key fob yourself. Most difficult part is to disassembly fob’s case. It's pretty easy with our step by step guide.

The cost to change the battery inside fob is in range $50-600 depending on the make and the service pricing.

Remote key fob batteries in Mercedes-Benz S500 should be replaced every three or four years, but this will vary based on usage and build quality. If your remote key fob shortened signal strength, you should change batteries before it stop close doors and make trouble for you.

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

Fob Compatibility:

  2. Models: 1999-2006 Mercedes-Benz S500