Car Keys and Diving...

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The Mercedes key that I have comes with a detachable valet key... The only problem is when I unlock the car with it the moment I open the door all hell breaks loose with the alarm.

Figure out why the alarm goes wonky. It shouldn't. That's the very essence of the valet key.
 
My Jeep is a simple creature, no goofy electric keys. I just carry the key on my person, often on a chain or in a pocket if I have one. I also hide a key in a magnetic case. And just in case somebody figures to steal it anyways, I also have a hidden button that arms/disarms the ignition and I might also pull the OPDA sensor plug if I am particularly concerned. I would hook up something more effective but fear for the safety of innocent bystanders. It is not nice to (try) to steal my Jeep. N
 
Figure out why the alarm goes wonky. It shouldn't. That's the very essence of the valet key.


Its most likely not really a valet key. It is primary purpose is to unlock the door if the transmitter battery goes dead.
 
My current truck has the keypad on the door, easy!

My previous truck I used a hitch safe, almost as easy.
 
My story. I drive a 2012 Nissan SUV. So, I was thinking about how to solve your problem for myself. My original thought was just to use the included standalone key (that is inside the FOB). But what to do with the FOB? It won't let you close the car with the FOB inside (for those who are stupid to lock themselves out). That is by pressing a button on the outside of the handle. I even bought a copper mesh to hide the FOB inside, this would act like a faraday cage, will not allow radio signals in or out. To my surprise, I found out, if you lock the car with the key, the FOB can be allowed to be locked inside. Thus, right now I dive with a key (made a copy in Lowes for like $2) and I have an extra hidden inside the body of a car. Works really well.

You can try something like this as well: HitchSafe Trailer Hitch Key Safe - HHS7000

---------- Post added April 17th, 2015 at 11:24 AM ----------

Figure out why the alarm goes wonky. It shouldn't. That's the very essence of the valet key.

I think you lock your car in a regular manner. That is why the alarm goes off. Try LOCKING the car with the valet key. I bet UNLOCKING it THEN would produce no alarm.
 
The Mercedes key that I have comes with a detachable valet key... The only problem is when I unlock the car with it the moment I open the door all hell breaks loose with the alarm.

When you LOCK the car, are you locking it with the remote? If I lock my car with the remote and then use the valet key to unlock it, yes, the alarm goes off. But if I lock my car with the valet key or by pressing the door lock lever manually before closing the driver's door, then unlocking it with the valet key does not set off the alarm. Of course, a pricey Mercedes may not be so compliant as my Toyota.

---------- Post added April 17th, 2015 at 12:26 PM ----------

Looks like the previous post beat me to it while I was typing.
 
Personally I would never take a $100+ electronic key underwater, no matter what you keep it in. Some disagree.
 
One of the guys I dive with has a hitch-safe and he drops his keys in that.

Mercedes with a hitch........ FUNNY......

dive lights (sans batteries) makes a nice case that you know what it is rated for...
 

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