Replace Key Fob Batteries

2004 Mercury Grand Marquis Key Fob Battery Replacement Instructions

2004 Mercury Grand Marquis Key Fob Battery Replacement Instructions

If your auto keyless entry remote is not unlock doors well, the battery likely must to be replaced. Yes, it is possible to change the battery in your key fob by yourself. All you need is outlined in this post.

What kind of battery keyless entry remote use

Prior to disassembly key fob check all that you need: one CR2032 battery and flat head screwdriver.
  • flat head screwdriver
  • 1xCR2032 battery

Step by step guide

A coin battery installed in the your keyless entry remote. Delicately try to disassemble your key with hands or flat head screwdriver. Remove CR2032 battery with flat head screwdriver.

Change old battery with fresh one CR2032. 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 battery installed, check key fob by pressing buttons. If all functions works, assemble your keyless entry fob's case in reverse order.

The last thing to do is put your cover back on fob. Accurately try to assemble the two halves in place by hands from top to bottom. If your key shell tightly closed, we done. If not, repeat the last step.

How to replace the battery video instruction

DIY: Ford Keyless Remote Battery Replacement & Disassembly

Still not working? Buy new one

Frequently Asked Questions

Key fob of Mercury Grand Marquis use 1xCR2032 batteries. Price for CR2032 batteries are under $6 depending on the brand, type and size packaging you buy. You can take old battery to the store, to find a proper replacement.

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

Yes, you can change battery in your 2004 Mercury Grand Marquis key yourself. Most difficult part is to disassembly fob’s case. It's pretty easy with our guide.

The price to replace the battery inside keyless entry remote is from $30 to as high as $500 depending on the brand and the service pricing.

You should replace batteries inside remote key fob of modern cars at least every three or four years. The term of battery differ on their amount of use, operating conditions and quality.

These signs will warn you that it's possible time to change battery in your 2004 Mercury Grand Marquis: you didn't change battery more than 4 years, multiple clicks to unlock or lock doors required, key fob buttons not working and low key battery indicator on dashboard.
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Contents:

  1. Battery Size and Tools
  2. Replacement Guide
  3. Video Instruction
  4. FAQ

Other Mercury Models:

Fob Compatibility:

  1. FCC ID: CWTWB1U343 | CWTWB1U313 | CWTW
  2. Models: 1995-2006 Mercury Grand Marquis