How do I disable the keyless entry on a 2003 Mazda Protege5 by myself
(without taking it to the dealer)?  One set of keys was stolen and I
don't want the thieves to be able to unlock my car using the remote.

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Request for Question Clarification by redhoss-ga on 04 Nov 2005 06:58 PST

I can think of several ways, but you would not have use of your power
door locks. Here are some Mazda wiring diagrams:

http://www.autoshop101.com/forms/maz-ewd.pdf

I would be glad to discuss my ideas.

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Clarification of Question by tjmack-ga on 04 Nov 2005 09:59 PST

So long as the locks still work manually, that will be ok. 
Preferably, it would be simple to turn the power locks on and off (ie
disconnect or connect a wire).  I've never locked the hatch manually,
but I assume you just use the key.

Hello tjmack, I take great delight in defeating high tech stuff that
automotive geniuses put on automobiles. I believe that we will be able
to find a way to disable your remote door lock sysyem that will be
just fine. First you need to download this .pdf file (let me know if
you have a problem):

http://www.autoshop101.com/forms/maz-ewd.pdf

Go to page 58 and you will see what I hope is a typical Mazda wiring
diagram for the door lock system. The best solution to your problem
might be if you can locate the red wire that comes out of the "door
lock relay" module. If you can locate and disconnect that wire, you
should still be able to lock your doors electrically. Where the "door
lock relay" module is located might be a problem.

Another way that would absolutely work is to remove the 30 amp fuse
that powers the whole door lock system. You should be able to rig a
switch so that you could turn the system off/on without having to
remove a fuse every time.

The wire that comes out of the fuse block shows to be white/green
striped. You could also cut this wire and achieve the same thing.

Let me know if you have any problems with any of this and I will try
and help. I am proud of you for trying to do this yourself and not
going to the dealer.

Good luck, Redhoss

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Request for Answer Clarification by tjmack-ga on 07 Nov 2005 06:53 PST

Great.  Thank you for the information.  I will attempt this today. 
Any thoughts on where I might find the door lock relay module?

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Clarification of Answer by redhoss-ga on 07 Nov 2005 10:14 PST

I did have one thought. It might make a noise when the relays
activate. Maybe you could hear it when you actuate the remote.

Pulling out the fuse was the easiest and most effective method. 
Thanks for the advice!