Dead battery or ??????

[eomran]

MY 2001 4.4 X5 was in the garage for 4 days, I came back to town last night, the bluetooth kit was there too, so I tried to see if it gonna work or not after I did all the connections and turned the key on the system was working good, I was so exhausted from being out of town so I decided to discconect everything and go to be.

I did disconnect the ULF while the ignition was on.

Today, I tried to statrt the car, it will not start, the interior light are on but it will not start, plus evertime I tried to start the head light will come on even the switch is off, I do not know if it is a battery issue or I missed something when disconnecting the ULF module last night.

any help