nissan truck neubie needs help
 

I recentely purchased a 2001 frontier crew cab w 6 disc changer. The only complaint i had was the stereo did not sound good enough. I took it to a local audo store to have new speakers and an amp put in. They tapped into the factory stereo and did the install. This is where the problem started. My power locks quit working with both switch and remote. 1 power window wont work from drivers side door switch and abs light is on. The truch only has 50 thou miles and never
did any of this until the stereo upgrade. I was told that the bcm has something to do with all these problems and is connected to the radio,locks,windows,instrument cluster. Can anyone help me figure this out. I havent had my truck in 4 days now and i want them to fix it and give it back. Thanks for your time.[&o]