Instructables

Exorcising a Haunted Key Fob

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This is the key fob for my 2012 Hyundai Sonata in the key wallet I usually carry. Hyundai owners with this key fob sometimes find the trunk on their cars opened by itself, as if haunted. There is a lot of discussion about this problem on owners' forums. Some are certain it is caused by an electrical anomaly in the car's systems or by interference from a stray radio signal. One man carried his key fob in a separate hard case and never had an occurrence of the trunk opening by itself during that time. When he carried his key fob in a wallet, his trunk sometimes opened mysteriously. See the text boxes on the photo. I have found my trunk opened by itself about four times. Each of those was while the car was parked in my garage. I think the little button that is part of the wallet clasp may have exerted pressure on the trunk button on the key fob. This Instructable will show how to make a hard cover for the key fob that still allows easy access to the fob for use.
 
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Step 1: What is available commercially

Picture of What is available commercially
These key fob covers are available in various colors for about $9 US each. I decided to make my own key fob shield from the cover of an old computer power supply. (The image is from Amazon. To view product information, follow the link.) Tools
  • Metal shears or snip
  • Marking pen
  • Ball peen hammer
  • Stack of newspaper
  • Drill
  • Grinder
  • Needle nose pliers
  • Wire feed welder (unless the non-welded version is chosen)
Materials
  • Light gauge steel from a computer power supply case, or something similar

Step 2: Pound to fit the fob

Picture of Pound to fit the fob
Auto body people have a leather bag filled with lead shot. They place a piece of sheet metal on it and pound with a hammer to make rounded indentations in the metal surface. I used a stack of old newspaper on top of my workbench and a ball peen hammer. I pounded a recess into the metal sheet to fit the contours of my key fob.
a1auto10 months ago
Interesting! Had never heard of the Haunted Hyundai syndrome before.
Phil B (author)  a1auto10 months ago
Thanks. It gets lots of attention on forums for Hyundai owners.
dpsilver1 year ago
nice work with the pounding bro but you can make your own bag using the same leather or thick cloth and some sand
Phil B (author)  dpsilver1 year ago
Thank you for the suggestion. It will probably be years before I need to do this again. A few newspapers in a stack made a good impromptu substitute.
Bill WW1 year ago
Nice work Phil. The method of forming sheet metal will be useful for many of us. I keep several sheets of thin brass for such work, which so far has been all 2D. Ace has a fair supply.

Phil B (author)  Bill WW1 year ago
Thanks, Bill. I used about an inch and a half of newspaper on my stack. It worked pretty well. (This is not really a new submission, but I found a small edit to make, and the app for my smart phone required me to tap on the publish button before I could finish.)
3366carlos1 year ago
wow, you are hardcore about that fob!
Phil B (author)  3366carlos1 year ago
I showed my Instructable to a friend who has the same car I have. He has had four events related to his trunk lid opening without a command from him and they had him concerned. Then he asked me to make to fob covers for him. So, I created more work for myself by sharing my success. But, neither of us has had an open trunk lid event since using the fob covers. I am pleased with how well this approach has worked for both of us. Thank you for looking and for commenting.
rimar20001 year ago
Clever as always, Phil!
Phil B (author)  rimar20001 year ago
Thank you, Osvaldo. You do not have problems like these in Argentina, do you?
Fortunately my car alarm has buttons with hard springs, and never had that problem, Phil.
ChrysN1 year ago
Nice, what a neat and simple solution.
Phil B (author)  ChrysN1 year ago
Thank you. I probably spent a little more time on it than I should have, but I like it.
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