The simplest answer is that areas affected by the aftermarket system will be
rejected. In this case, if the door locks don't work afterward or if
something is broken in the process, the dealer won't ask Honda to pay for
it; they will expect you to take it to the installer. However, if your
engine starts burning oil or the tranny acts up the aftermarket work won't
be a consideration (unless the installers got really wild and crazy!)
If anything goes wrong which is related to the installation then it
absolutely will not be covered by warranty. Other things which have
nothing to do with your installation will still be covered.
There are gray areas, like a suddenly failed battery. Honda might claim
that this is being caused by extra current draw for the aftermarket
Personally I wouldn't do it.
Motorsforum.com is a website by car enthusiasts for car enthusiasts. It is not affiliated with any of the car or spare part manufacturers or car dealers discussed here.
All logos and trade names are the property of their respective owners.