How to Replace the Acura MDX Key Fob
An Acura MDX key fob is a convenient device that allows you to remotely lock and unlock the doors on your vehicle, open the rear hatch, sound the alarm, and even start the engine. The key fob runs on a small replaceable CR2032 coin cell battery which normally lasts 1-2 years with normal usage before needing to be replaced. This guide will provide detailed instructions on replacing the battery yourself to restore functionality to your Acura MDX key fob.
Signs It’s Time to Replace Your Acura MDX Key Fob Battery
Your key fob relies on having adequate charge in order to send and receive signals with your vehicle wirelessly from a distance. As the battery runs down over time, you may notice issues such as:
- Reduced operating range (needing to be closer to vehicle)
- Intermittent issues with buttons not working
- Warning lights on your dashboard related to the key fob battery
Replacing the CR2032 battery every 1-2 years or at the first signs of the above issues can help avoid being inconvenienced by a key fob that stops working at inopportune times.
Before You Replace the Battery
Replacing the battery in an Acura MDX key fob only takes about 5-10 minutes. However, taking a few minutes to prepare can make the process easier:
- Safely park your MDX in a garage or driveway and shift to Park/turn off the engine
- Gather a new CR2032 3V coin cell battery, a Phillips head precision screwdriver, a towel, or a cloth
- Review key fob battery replacement instructions
- Ensure you have 10-15 spare minutes
CR2032 replacement batteries are broadly available at electronic stores or online for only a few dollars.
Step-By-Step Guide to Replacing the Battery
Follow these step-by-step instructions to safely install a new battery:
Step 1: Locate and open the key fob
On the back of the key fob is a small Phillips head screw. Place the towel or cloth down and carefully use the screwdriver to remove the screw, which will allow you to gently pry apart the two halves of the plastic key fob.
Step 2: Remove old battery
Once the two halves are separated, gently slide out or remove the old CR2032 battery and discard it properly.
- Inspect the key fob for any signs of corrosion or damage on the battery terminals. Use a cotton ball and rubbing alcohol to gently clean any corrosion present.
Step 3: Properly align new battery
The new CR2032 replacement battery has a “+” positive terminal and a “-” negative terminal. Align the terminals with the matching positive and negative metal tabs inside the key fob.
Step 4: Secure battery in place
Gently press down to properly seat the new battery into the slot. Ensure the battery is secure in the connector bracket before moving on.
Step 5: Reassemble key fob halves
With the battery securely installed, carefully rejoin the two halves of the key fob plastic housing. Replace the Phillips screw and gently tighten it to re-secure the halves. Avoid over-tightening.
Step 6: Test and use key fob
Unlock and lock your Acura MDX doors using the key fob buttons to ensure normal functionality has been restored. Try starting the vehicle as well. Use as normal for 1-2 weeks to confirm it is working properly before tightening the screw firmly.