No Radio
Thread Starter
Heel & Toe
Joined: Jan 2017
Posts: 15
Likes: 1
No Radio
I just finished rebuilding the engine and transmission of my 1990 Corvette. I also had the car chipped. I have driven my car about 10 miles and have not found any problems except with my radio. I have power to my radio, power to my antenna, and power to my speakers, however, I have no music coming from the speakers, I only have a humming noise. I have the factory Bose gold system in the car. Does anyone know what could be causing this?
Instructor
Joined: Aug 2018
Posts: 168
Likes: 22
From: New York
I have a 90 with the Bose Gold system. Each speaker has its own amplifier board. Over time (and not usage) the capacitors on the board leak and cause the speakers to not work. Usually, they go out one at a time but it's not unheard of for all to just about go out at the same time. The head unit that you turn the radio on and off with, select stations etc. is just a controller. If your antenna goes up and down and you can select stations and your time is correct it's probably working ok There's actually a good chance the CDM (Control Data Module) box has gone bad. That unit which is located behind the passenger side dash also has capacitors which over time leak on the circuit board and cause the system not to work. I sent my components to Factory Car Stereo in Florida, (and got my system working again). They do good work and have several good how-to videos on YouTube.
Thread Starter
Heel & Toe
Joined: Jan 2017
Posts: 15
Likes: 1
I have an extra CDM so I will change that out and see what happens. Is there a ground somewhere in the engine bay that could cause this? Was wondering since I took it all apart, could I have forgotten to put on a ground and this happen as a result?
Thread Starter
Heel & Toe
Joined: Jan 2017
Posts: 15
Likes: 1
I just tried both of my spare amps, and no change. What I did notice is that when I try to change the volume of the radio, the humming stays at the same level, the volume **** does nothing. Could it be the head unit even though it only acts as a controller?
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Thread Starter
Heel & Toe
Joined: Jan 2017
Posts: 15
Likes: 1
I have 2 extra speaker amps that I tested a little over a year ago and they were both good, I plugged both of them in and no change. I have 2 extra CDMs so I tried both of them and no change. I have an extra head unit, so I tried it and no change. Is there anything else I could check before I try some more amps?
Instructor
Joined: Aug 2018
Posts: 168
Likes: 22
From: New York
Make sure the antenna is connected at the CDM and at the antenna itself. Also make sure the grounds are tight inside the kick panels. Other than that I can’t think of anything else causing the humming.