Hi Mark, Yep the sharing wire thing is definitely possible - replaced a few factory headunits that have had weird stuff like this! i think holdens do this a lot??
Did the stereo you replaced change its level of contrast when the lights were turned on? If not, then it probably wasnt hooked up to the illumination, and if thats the case Im stuck. Having a squiz at the wiring diagram (from a workshop manual, public library etc) would help take out the guesswork too. Andrew > Thanks for the replies, but the problem is i can't find a fuse > that has been blown! Also, there were only 7 wires going to the > old head unit - which seemed to me to be: > Constant 12v > Accessory 12v > Earth > Front left neg > Front left pos > Front right neg > Front right pos > (there were no rear speakers) > Out of those 7 wires which one is likely to have been the illumination wire?? > - Something that came to me just then is that maybe the old stereo > used a common ground between the two front speakers, which would > mean one of the wires that i have hooked up to a speaker could be > the illumination wire... does this sound possible? The only thing > that makes that hard to believe is that both the front speakers > are working :( > > Any more ideas guys? much appreciated! > Mark > > --- "GREENBURY, Andrew Robert" <[EMAIL PROTECTED]> wrote: > >Hi Mark, > > > >Just to add to Chris's response, modern cars have factory stereos which > >change their illumination when you turn your headlights on - to know the > >lights are on they need a signal from the illumination circuit. Hence when > >you replace the head unit you have this 'extra' wire that doesnt seem to > >do much so it is assumed to be extraneous, or hooked up to the wrong thing > >etc, resulting in fuses blowign etc. this wire from the illumination > >circuit is generally simply 0V that goes to +12V when you turn your > >headlights on. Hope this explains why the illumination circuit has to do > >with a stereo a bit better. > > > >Andrew > > > >On Mon, 20 Jan 2003, Mark Firman wrote: > > > >> Hi all, > >> Can anybody who knows a bit about mobile electronics explain to me the > >> concept of the illumination circuit (i.e. dash lights etc) and how it > >> works, and also why it has anything to do with a car's stereo ... Any > >> explanation, complex or simple, would be a great help! > >> Cheers, > >> Mark Firman > >> > >> _____________________________________________________________ > >> Get Your free Ozdat Email Account > >> ---> http://www.ozdat.com > >> > >> _____________________________________________________________ > >> Select your own custom email address for FREE! Get [EMAIL PROTECTED] w/No Ads, >6MB, POP & mor e! http://www.everyone.net/selectmail?campaign=tag > >> > >> > > > > _____________________________________________________________ > Get Your free Ozdat Email Account > ---> http://www.ozdat.com > > _____________________________________________________________ > Select your own custom email address for FREE! Get [EMAIL PROTECTED] w/No Ads, 6MB, >POP & more! http://www.everyone.net/selectmail?campaign=tag > --membersozdat------------------------------------------------------- OZDAT Mailing List Please Note:- Send (un)subscribe requests to [EMAIL PROTECTED] Send submissions to [EMAIL PROTECTED] No unauthorised redistribution of this email http://www.ozdat.com/ozdatonline/index.htm http://www.ozdat.com/ozdatonline/listindex.html http://www.mail-archive.com/[email protected]/ ---------------------------------------------------------------------
