Here are some useful modifications for Toyota Tacomas in the 2000-2004 year range

Warning: proceed at your own risk!!! This might or might not work for you as you may have a different type of vehicle or keyless remote entry. In no case do I take any responsibility as to the outcome of using these instructions on your vehicle! If you decide to try this on your car you are on your own! Another important comment is that this procedure does not apply to keys that have built-in transponders. This only applies to remote keyless entry!

Custom Tacomas has a lot of good technical how-to articles, check them out:

If you have a keyless entry system, there isn't much you need to do to enable the built-in alarm system:

Passive Arming ON/OFF Selection, Entry Delay Selection:

Driver's door / all-doors unlock selection:

Ignition controlled automatic door lock/unlock:

Want to add keys to your keyless remote entry, here is how to do it:

add remote part 1

add remote part 2
Here are similar instructions for Celica, ECHO, Highlander, Prius, RAV4, Corolla, Matrix:

A great source for programming remotes is:

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Page last updated January 11, 2007