Ford Mustang and Ford Mustang GT 1994-2004: Why Isn't My Key Fob Working?

This article applies to the Ford Mustang and Mustang GT (1994-2004).

You've had your key fob for some time now. It might work after pressing one of the four buttons repeatedly, but it's not as responsive as it used to be. Or, it might not work at all. The problem could be a blown fuse, which you'll need to pop the hood of your Ford Mustang to access, or it could be a much simpler fix. If the key fob needs to be completely re-programmed, don't panic. The programming procedure is very straightforward and you can complete the simple steps right from the driver's side of your vehicle. Best of all, you won't need to visit a local Ford dealer or mechanic at any point for replacement parts.

Step 1 – Check your key fob battery

It might be dead.

Your key fob is battery operated, and over time your battery can die. Swapping out your old battery for a new one is easy. All you have to do is slide open the key fob cover and remove the old battery. Install a new battery once the old one has been removed, and then close the key fob cover. Check your key fob by pressing one of the four buttons on the transmitter.

• Always keep your key fob in a dry location.
• Typically, key fob batteries last for three to four years depending on use.
• Replacement batteries can retail for as little as $2 to $5 online, as well as through local auto parts stores.

Step 2 – Check the fuse

It might be blown.

Here's how to check your remote control door lock receiver fuse:

• First, you'll need to pop the hood of your Mustang to access your fuse box.
• Using your fuse box diagram, determine the location of the remote control door lock receiver fuse.
• Once you've identified the location of the fuse, remove it using your fuse puller or a pair of tweezers.
• Check the fuse for signs of damage, such as the presence of a solid black color inside the fuse or a break along the metal stripe in the middle of the fuse.

Step 3 – Check the operation of your key fob

It might simply need to be re-programmed.

You have two options here: re-program the key fob yourself or pay a professional to do it for you at a cost of around $80+ or more.

• Starting with all your vehicle doors closed and your key already in the ignition, go ahead and run your Mustang.
• Maneuver the door lock switch into the "UNLOCK" position and hold it there.
• Cycle your engine twice. In other words, turn your Mustang on and then off for two full passes: ON, OFF, ON, OFF.
• Release the "UNLOCK" switch. When you do this, your vehicle doors will immediately lock and unlock to affirm programming mode has started.
• Take your key fob and press and hold the "LOCK" and "UNLOCK" buttons on your first key fob transmitter.
• Wait for your doors to lock and unlock, which should occur within about 15 seconds of pressing both buttons.
• Reprogram all remaining key fobs.

Related Discussion

• Key Fob Quit Working - MustangForums.com