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#900477 - 14th Sep 2014 8:45pm stereo head unit
alann Offline
Enthusiast

Registered: 22nd Aug 2011
Posts: 186
Loc: wallasey
hi all, looking for a bit of advice regards head unit, the problem is....

when the ignition is on radio and cd work fine, backlight, station ID all show, start the engine all is lost, no sound, station ID, or cd, the only thing lit is the backlight, turn engine off and it all works again, head unit is wired correctly using an ISO connector, no damaged or cut wires, thanks in advance....

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#900498 - 14th Sep 2014 10:46pm Re: stereo head unit [Re: alann]
Habdab Online   content
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Registered: 12th Jun 2011
Posts: 215
Loc: Wallasey
sounds like you have no live connected that keeps the memory as the ignition switch cuts auxilliaries to ensure power to the starter.

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#900539 - 14th Sep 2014 11:37pm Re: stereo head unit [Re: alann]
alann Offline
Enthusiast

Registered: 22nd Aug 2011
Posts: 186
Loc: wallasey
I thought that but even if car is started first, then radio turned on all you have is the back light, no display details, no station ID, and CD will not play, forgot to mention this is not the factory fitted unit, it is an aftermarket one....

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#900566 - 15th Sep 2014 12:04am Re: stereo head unit [Re: alann]
ZipperClub Offline
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Registered: 2nd Dec 2012
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#900567 - 15th Sep 2014 12:23am Re: stereo head unit [Re: alann]
alann Offline
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Registered: 22nd Aug 2011
Posts: 186
Loc: wallasey
thanks zipper, will give it a go tomorrow...

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#900586 - 15th Sep 2014 8:29am Re: stereo head unit [Re: alann]
j_demo Online   Know_it_all
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Registered: 4th Nov 2011
Posts: 1839
Loc: Wallasey/New Brighton
Could it not be a bigger problem, ie your alternator?

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#900592 - 15th Sep 2014 9:47am Re: stereo head unit [Re: alann]
alann Offline
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Registered: 22nd Aug 2011
Posts: 186
Loc: wallasey
How would alternator affect loss of radio stations!!!

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#900633 - 15th Sep 2014 3:00pm Re: stereo head unit [Re: alann]
Gibbo Online   content
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Registered: 27th Dec 2010
Posts: 1720
Loc: Oxton
I'd suggest checking with a multimeter what current you're getting on the two 12v lines that supply the radio, they're usually red and yellow.

One will be a permanent live that keeps the memory settings, the other will be a live that's only on during ignition.

And if its a Peugeot or Citroen, you're supposed to disconnect the battery and do a BSI reset when changing over a stereo.

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#900649 - 15th Sep 2014 6:17pm Re: stereo head unit [Re: alann]
j_demo Online   Know_it_all
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Registered: 4th Nov 2011
Posts: 1839
Loc: Wallasey/New Brighton
Originally Posted By: alann
How would alternator affect loss of radio stations!!!

Its just a theory but: no engine running = vehicle powered by battery.

As soon as you turn engine on all electrics powered by alternator.

Dodgy alternator = no electrics.

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#900789 - 16th Sep 2014 12:16am Re: stereo head unit [Re: j_demo]
ZipperClub Offline
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Registered: 2nd Dec 2012
Posts: 7253
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So if it had no electrics how would the car start? If the alternator was faulty it would not charge the battery. Not the alternator for sure, just needs the wiring on the radio sorting.
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#901019 - 17th Sep 2014 12:13pm Re: stereo head unit [Re: ZipperClub]
reddragon Offline
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Registered: 22nd Mar 2010
Posts: 3902
Loc: bromborough/wirral
all stereos I've wired into cars have used red and orange together or red and yellow together to keep memory live hope this helps
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#901024 - 17th Sep 2014 1:11pm Re: stereo head unit [Re: alann]
_Ste_ Offline


Wiki Master

Registered: 7th Aug 2005
Posts: 15985
Loc: New Brighton
yo


if its a sony head unit you need to join the red wire to the yellow and the yellow to the red, they are the opposite in a vauxhall, vauxhall is red to red and yellow to yellow.

LET US KNOW WHAT MODEL YOU HAVE

Oh and ignore dragons comment if you dont want to risk burning your van and tools to a messy pile of ash and rubber.

one wire is memory and one wire is main (ignition on) power which is switched.

connecting both to the same mains supply defeats the object or the manufacturers would of done that in the first place bro wink
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#901252 - 18th Sep 2014 12:41pm Re: stereo head unit [Re: alann]
alann Offline
Enthusiast

Registered: 22nd Aug 2011
Posts: 186
Loc: wallasey
gibbo its a 206, have re-set BSI, but still no joy,

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#901279 - 18th Sep 2014 3:30pm Re: stereo head unit [Re: alann]
Gibbo Online   content
Forum Addict

Registered: 27th Dec 2010
Posts: 1720
Loc: Oxton
Do you still have the stock radio to try?

And if it is a Sony, to reinforce what Ste posted, its worth looking at the diagrams in the boxes marked A, B & C on page 2 of this PDF:

http://pdf.crse.com/manuals/4125799211.pdf

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