I recently bought an 04 coupe with the Bose sound system. I realized while test driving the car that the sound system wasn't working and got the price lowered so i could get it fixed. while I was driving it home I hit a bump and the speakers started working. After this I thought there might be a loose connection to the amplifier. Just by pushing on the wiring harness i managed to get it to work again but only until I turn off the car. I checked to make sure all wires on the harness are getting electricity and they are. I tried getting a new amplifier and still had the same problem. If someone has any suggestions for what to try next, or what the problem is please let me know.
-No static noise or anything just nothing coming from the speakers.
-If for some reason it does decide to work it will never cut out while the car is started.(I start the car again and they don't work anymore)

 

Your post is not very clear. When you say you hit a bump and the speakers started working what is your audio source? Does the power remain on to your audio source?
AM?
FM?
CD?
Other USB, Etc?
When there is no sound coming out of the speakers does the audio system remain on with power?
Could it be an antenna problem if the radio is the source?
If you swapped out an amplifier and the problem remained then the problem could be in the audio source or the wiring harness?
A cold solder joint can be the source as could a poor connection in the wiring harness?

 

Your post is not very clear. When you say you hit a bump and the speakers started working what is your audio source? Does the power remain on to your audio source?
AM?
FM?
CD?
Other USB, Etc?
When there is no sound coming out of the speakers does the audio system remain on with power?
Could it be an antenna problem if the radio is the source?
If you swapped out an amplifier and the problem remained then the problem could be in the audio source or the wiring harness?
A cold solder joint can be the source as could a poor connection in the wiring harness?

 

Your post is not very clear. When you say you hit a bump and the speakers started working what is your audio source? Does the power remain on to your audio source?
AM?
FM?
CD?
Other USB, Etc?
When there is no sound coming out of the speakers does the audio system remain on with power?
Could it be an antenna problem if the radio is the source?
If you swapped out an amplifier and the problem remained then the problem could be in the audio source or the wiring harness?
A cold solder joint can be the source as could a poor connection in the wiring harness?

 

When i hit a bump the audio source was AM. I use a Bluetooth fm transmitter otherwise. Power remains on to the audio source. Ive checked if there is power coming through wires in the harness.

 

When i hit a bump the audio source was AM. I use a Bluetooth fm transmitter otherwise. The audio source remains on with power. Ive checked if there is power coming through wires in the harness.

 

See page AV-24 for self diagnosis procedure

https://www.nicoclub.com/service-man...pe/2004/av.pdf

 

Sounds like a busted head unit.