How to Open Your 2002 Mercedes-Benz S500 Key Fob & Change Battery

How to Open Your 2002 Mercedes-Benz S500 Key Fob & Change Battery

Key fob grant easy access to your auto. When the key fob battery is discharged you will lose your fob’s ability to control distance functions. It's not complicated to change the battery in your remote key fob, and it’s easier than you think. All you need is explained in this article.

What size battery does 2002 Mercedes-Benz S500 remote key fob required

Changing batteries in keyless entry remote require flat head screwdriver and 2 CR2025 batteries. Prepare these materials and tools before opening and make sure to match the type of your keyless entry fob's batteries.
  • flat head screwdriver
  • 2xCR2025 batteries

Step by step instruction

Inside of your key fob installed button battery. Remove any internal key first, and then try to pry apart the keyless entry remote.

Gently try to disassemble your remote key fob with flat head screwdriver. Remove two CR2025 batteries with flat head screwdriver.

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

Before assembling keyless entry fob's case, make sure that all functions works by pressing buttons on circuit board.

At this point squeeze keyless entry fob's back cover together. Line your shell pieces together and assemble it in place by hands from top to bottom. Inspect your remote key fob body for gaps. If it is not tightly closed try to repeat last step.

How to replace the battery video guide

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

Still not working? Buy new one

Frequently Asked Questions

Remote key fob of Mercedes-Benz S500 use 2xCR2025 batteries. Most CR2025 batteries are under $6 depending on the brand, type and size packaging you buy. Take your old battery to the store, to be sure.

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

Changing your keyless entry remote battery is simple to do in 2002 Mercedes-Benz S500. Most of car manufacturers think about customers and make a special hole for remote key fob disassembly.

Car service pricing for replace the battery in keyless entry remote is from 50 to 600 dollars depending on the make.

You should replace batteries inside remote key fob of modern cars at least once in three or four years. The term of battery vary on frequency of use, operating conditions and quality.

If your auto signal strength reduced, fob's battery more than 4 years old, need multiple clicks to unlock or lock doors or key fob buttons not working, in most cases battery replace inside remote key fob required. Current battery is weak or dead with a high probability, but if it's not help, remote key fob change or repair needed.
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Fob Compatibility:

  2. Models: 1999-2006 Mercedes-Benz S500