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[p j morgan]

it sounds like the volume control is on the way out especialy when you say it comes back on loud ? :-/

[Dave DND]

it sounds like the volume control is on the way out especialy when you say it comes back on loud ? :-/

The common volume control fault is very easily diagnosed by wiggling the actual volume knob. The fault is caused by dry joints at the back of the switch itself.

One of the first things I suggested to try, but as it appears to have drawn a blank reply, we can only assume its more involved.

[colin33]

Sorry for the delay in responding - I have tried wiggling the volume control but it makes no difference.  No crackling or any cutting out.  In fact it feels OK.

If it is the switch rather than the pot then perhaps this won't necessarily caus ethe problem by wiggling it.  Are the possible dry joints easy to access?  I can easily re-solder them if they are just to make sure.

Colin

[Dave DND]

Sorry for the delay in responding - I have tried wiggling the volume control but it makes no difference.  No crackling or any cutting out.  In fact it feels OK.

If it is the switch rather than the pot then perhaps this won't necessarily caus ethe problem by wiggling it.  Are the possible dry joints easy to access?  I can easily re-solder them if they are just to make sure.

Colin

By wiggling the switch, you would know very quickly if you had a problem !!

[colin33]

OK - for all those watching and wondering about this problem - its all fixed.

Thanks eventually to Dave - I found one of the speaker leads had disconnected inside one of the back doors (who ever sits there?), and was rattling around, sometimes grounding on the door metalwork!  So the amp must have been shutting down under overload as Dave suggested.

So if anyone has a similar problem - check the speakers and their wiring first!!

Thanks again Dave, well done.

Colin

[Dave DND]

Engaging Smug Mode

 8-)

[taifunk]

I have a bit similar problem.
When starting with hot motor or when the car has heaten up by sun, the audio goes to on-off cycle. Music plays for 4 secons, then its silence for 12 seconds and the loop starts again. The strange bit is that sometimes the audio stays on when I start the engine about 3-4 times again. Sometimes even that woun't help.
By now I have suspected that a capacitor in the amplifier is the reason. As it drains out, the audio mutes (11 sec) and when it is charged up again the audio plays (4 sec) ant then looping. But I can't explain why it sometimes stays on when I crank the engine few times.

By reading this topic, I found another possible reason for my problem. But before I start to rip my car up I would appreciate if you could point me what and how to check.
Will I open all mu speakers up and check for loose connection? How can I get to an amplifier as it sits so hidden away at rear? What and Can I measure some components, earth, etc with multimeter?

I own a Opel Omega B Caravan 2001 2,5TD 96kw, NCDC2015 with Bose stereo

[Dave DND]

Sounds more like a loose plug at the rear of the stereo ?

 :-/

[taifunk]

I checked all the speakers (6) and found no bad connection. Of course I couldn't check the wireing inside the car, maybe that could be one reason.

[taifunk]

I accidentally found that if I press CLEAR for 6 seconds and reset the system, the sound stays on and everything works OK. Finally
But can I damage something when I start to reset the radio more often, like daily basis? Because there is still a problem somewhere and the resetting just repairs the problem and doesn't eliminate it. Right??

[Dave DND]

I accidentally found that if I press CLEAR for 6 seconds and reset the system, the sound stays on and everything works OK. Finally
But can I damage something when I start to reset the radio more often, like daily basis? Because there is still a problem somewhere and the resetting just repairs the problem and doesn't eliminate it. Right??

Correct 

You need to fix the problem.