russ29

the fm band on my Bose in my 2002 i35 has started to crackle and pop. It has nothing to do with the rear window defoster. Any ideas?

DennisMik

iTrader: (2)

It could be connections getting dirty. It could be the antenna amplifier module in the pillar between the rear window and rear door on the passenger side of the car going bad. Or it could be the head unit itself.

Unfortunately I don't know how to test any of these parts besides swapping it out and seeing what happens.

russ29

would the amp effect the am signal? noise seems to get worse as the car warms up. I'll see in the moning.

DennisMik

iTrader: (2)

Other than saying it could, I'm not able to give you a definite answer because I don't know the circuit design inside the amplifier.

If it is one amplifier circuit for both am and fm signals, both would be degraded at the same time. But because of the difference in the actual am and fm signals, I bet that each band has its own amplifier. Also, the electrical characteristics of the am and fm signals make them travel through the air differently. This has the effect of making the am signal easier to receive when conditions deteriorate.