I've got a 2001 MDX. Sat outside for the winter. Went to start it but it was totally dead. no lights inside or out. when i hooked up the jumper cables the horn blasted continuously. couldn't jump start it. disconnected the fuse on the horn. then tried charging the battery which did nothing for 4 hours. put the fuse back in for the horn, which was now quiet. bought and installed a new battery. still nothing. someone said it was the security system. tried locking and unlocking the front door. still nothing. That's where I am. Is it the security system cut off? If so, how do I bypass this and get the car started. (Flashers still work but thats it. no dashboard lights. no interior or turn lights. Help would be greatly apprecated.