Radio Issue - ZR-1 Net Registry Forums

Okiedoke · 08-21-2014

When I bought the 1991 Z, the radio wasn't working, so the dealer sent the 4 amps and CDM to Factory Car Stereo Repair in Florida for rebuild/repair. Once installed, the radio was working great. However, soon I noticed that the front right speak would not have any sound when I start the car. No static. Then after driving for 20 minutes, the sound would come back. I didn't get a chance to check to see if it's a loose connection and stopped listening to the radio for a few months. Now, whenever I turn on the radio, I just get this whirring sound and the speakers seem to be picking up the engine revs. If I step on the gas, the whirring gets louder. Let go and the whirring goes down. Kind of sounds like you're tuning a CB radio. Any idea what might be wrong and how to troubleshoot?

Thanks,
Harry

-=Jeff=- · 08-21-2014

all the speakers or just a particular corner of the car?

Okiedoke · 08-21-2014

I think all speakers. There's no music..nothing but the whirring.

White Bullet · 08-21-2014

I think the CDM is source of the problem. In general the CDM process the audio signal to each amplifier. If one speaker makes strange noises and the others are working that indicates that the amplifier in that speaker is bad. But with all of them making noise seems it would be caused by the CDM. I would check the connections at the CDM. If they are good I would contact the dealer or repair shop as I would think everything that was repaired would have some type of warranty.

PhillipsLT5 · 08-21-2014

Talk to Dr Don

Okiedoke · 08-21-2014

So if loose connections are ruled out, then it sounds like the CDM could be causing the whirring and the front right amp could be the reason for not having sound from that speaker before the whirring began. The amps have lifetime warranty and the CDM still has 4 months remaining. I'd better get on it right away.

08-21-2014	#1
Okiedoke Join Date: Nov 2013 Location: San Jose, CA Posts: 132	Radio Issue When I bought the 1991 Z, the radio wasn't working, so the dealer sent the 4 amps and CDM to Factory Car Stereo Repair in Florida for rebuild/repair. Once installed, the radio was working great. However, soon I noticed that the front right speak would not have any sound when I start the car. No static. Then after driving for 20 minutes, the sound would come back. I didn't get a chance to check to see if it's a loose connection and stopped listening to the radio for a few months. Now, whenever I turn on the radio, I just get this whirring sound and the speakers seem to be picking up the engine revs. If I step on the gas, the whirring gets louder. Let go and the whirring goes down. Kind of sounds like you're tuning a CB radio. Any idea what might be wrong and how to troubleshoot? Thanks, Harry __________________ 1991 ZR-1 #405 (white/black with blue pin stripes)

08-21-2014	#2
-=Jeff=- Join Date: Jul 2007 Location: Bartlett, IL Posts: 7,132	Re: Radio Issue all the speakers or just a particular corner of the car? __________________ 1990 Corvette ZR-1 #1051 Watson Headers (2" Primary) - 3" Magnaflow Bullet cats - LT4 Catback Late Model IH - Plenum Coilovers - 4.10s Custom Interior NCM Lifetime Member #978

08-21-2014	#3
Okiedoke Join Date: Nov 2013 Location: San Jose, CA Posts: 132	Re: Radio Issue I think all speakers. There's no music..nothing but the whirring. __________________ 1991 ZR-1 #405 (white/black with blue pin stripes)

08-21-2014	#4
White Bullet Join Date: Apr 2008 Location: Gainesville GA Posts: 232	Re: Radio Issue I think the CDM is source of the problem. In general the CDM process the audio signal to each amplifier. If one speaker makes strange noises and the others are working that indicates that the amplifier in that speaker is bad. But with all of them making noise seems it would be caused by the CDM. I would check the connections at the CDM. If they are good I would contact the dealer or repair shop as I would think everything that was repaired would have some type of warranty. __________________ 1991 ZR1, White/Red.

08-21-2014	#5
PhillipsLT5 Join Date: Aug 2005 Location: Scottsdale, AZ Posts: 2,450	Re: Radio Issue Talk to Dr Don

08-21-2014	#6
Okiedoke Join Date: Nov 2013 Location: San Jose, CA Posts: 132	Re: Radio Issue So if loose connections are ruled out, then it sounds like the CDM could be causing the whirring and the front right amp could be the reason for not having sound from that speaker before the whirring began. The amps have lifetime warranty and the CDM still has 4 months remaining. I'd better get on it right away. __________________ 1991 ZR-1 #405 (white/black with blue pin stripes)