help quick
 

my brother just bought a 93 525i he needs help he was trying to put a new head unit in his car but a cant hear anything and b cant hook up the ant. now with my e30 i had to bypass a bmw in car amp does he have to do the same or does anyone have a quick fix

What's the problem specifically? You can't hear anything at all? You can't hear the radio? Is the head unit in at all? More information is always helpful.

for your bros car he can buy an antenna adapter (Best Buy and other car audio shops have them) - had the same problem when I set mine up with JBLs and misc electronics

The Head Unit Is In And Wires Are All Connected But When You Turn Up The Sound All You Get Is Fuzzbut When You Use Cd Player Or Aux Imput You Get No Sound Now I Belive That All Im Doing When It Is On Amfm Is That Im Turning Up The Cars Internal Amp

correct capitalization and punctuation would help even more.

did you connect the remote turn on lead (amp lead, not antenna lead) to the "ant" lead on the adapter harness? If not you are not turning on the BMW amp.