new problem

[cupra_mul]

ok here is the deal. after getting my headunit in place and the wires for the amp.

i cant get power to my head unit!!
ive replaced it with the old one. and still nothing.
no flashing little light, no fartin noise, Have i blown a fuse??

also i have noticed that the air bag is constantly saying its off (i know something is wrong in that dept

can anyone help