jahangirkhan...language?
its not just honda or toyota in pakistan...if you mess up with the wiring system or any other system for that matter...the warranty becomes void...this is true for anywhere in the world.
in your case...it looks like that job was not done properly cuz a sound system or cng setup is a pretty straightforward install...so many ppl have it just fine. either way...why didnt you go to the person who installed it in the first place...just to find out what the problem was?