2003 Mercedes-Benz E320 Key Fob Battery Replacement Instructions

2003 Mercedes-Benz E320 Key Fob Battery Replacement Instructions

Remote key fob allow easy access to your E320. Once the keyless entry remote battery is dead or weak you lose your fob’s ability to control remote functions. In this case, we are going to tell you how to open your key fob and replace a dead battery yourself. If you choose to do it at home near E320, use this instruction, but don't forget to check all you need.

What type battery does 2003 Mercedes-Benz E320 remote key fob take

Changing batteries in key fob require flat head screwdriver and two 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 guide

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

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

Now it's time to install new batteries inside keyless entry fob's case. 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, check that all functions works by testing buttons on circuit board.

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

Key Fob Battery Replacement 2003 Mercedes-Benz E320 Video

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Still not working? Buy new one


Key fob of Mercedes-Benz E320 require 2xCR2025 batteries. Most CR2025 batteries are under $5 depending on the type, size packaging and brand you buy. You can take old battery to the store, to find a proper replacement.

Remote key fob in most of cases do not need to be reprogrammed after battery replace. If your key fob not working, recheck new battery voltage. If it is not help, read user's manual or contact local dealer.

Replacing your remote key fob battery is easy to do in 2003 Mercedes-Benz E320. Most of car manufacturers think about clients and make a special hole for remote key fob disassembly.

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

Remote key fob batteries in modern cars should be changed once in three or four years, but this will vary based on frequency of use and battery quality. If your keyless entry remote decreased signal strength, you should replace batteries before it stop close doors and make problems for you.

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

Fob Compatibility:

  1. FCC ID: IYZ 3312
  2. Models: 2000-2006 Mercedes-Benz E320