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Lost radio codes

Recently had new battery fitted,now radio will not work. I bought car secondhand with no owners manual. Renault Laguna Sport, year 2000, model 1.8 16valve.

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I don't know if this works on those newer type stereos but years ago people used to put vauxhall stereos in the freezer for 24 or so hours, defrost so there's no water on the circuits or pop the top off & wipe circuits dry, then power it up & the code is not needed any more.
I have done it myself before & it did work but they changed the EPROM chips after that little trick got around as EPROM stands for (Erasable Programable Read Only Memory) & freezing them worked, if that dosent work you could try finding the chip (look's like normal chip but has a white sticker over a glass lens on the top middle of the chip) ultra violet light re-sets some when passed over the chip lens, you could have a laugh & go to your local shop & use their note testing light as that has a UV Ultra Violet tube. anyway joking aside freezing cant hurt & it is a joke having to pay for your own car stereo code if it is legally your car stereo & you can prove it!
Have fun Oh & by the way im not insane just an electronic engineer!!!!

Posted on Mar 26, 2009

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Not familar with your car but I had same problem many years ago with a Vauxhall Astra and did same as you, disconnected battery and re-connected, radio didn't work - but my display kept flashing for security code to be re-input, which I didn't have.
Yours could be the same if radio not worked since disconnection - solution: if you dont have code & not in any documentation you got with car, then the radio will need to be re-coded by a dealer (expensive) or enquire with local car spares shops - they normally know a cheaper source. Mine cost about £18 (5 years ago) to get re-coded & I had to remove & reinstall myself.

Posted on Jan 01, 2009

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.Then please quote the MAKE + MODEL of your radio plus ALL the LETTERS and NUMBERS on any LABELS , BARCODES or STAMPED IN THE METAL CASING.


Also quote the MAKE of CAR it is fitted into.


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With the newer cars most radios have a theft deterrent device built into the radio, and if they steal your system it will not work in another jeep/car the dealer knows the unlock code, some charge to unlock the radio some don't.
That's why when doing electrical work on a car/truck etc. You have to have 12V DC power to the battery terminals all the time or you will loose the code and then only the dealer can help you unlock the radio.
HTH.
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2 Answers

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ok i dont know if this helps but i looked up some info on getting your radio code back

i dont know the codes off hand but this is what general consences says

"if you look on the right hand side of the radio, you will see a four digit code beginning with a letter. it is usually located near a bar code, and sometimes it says the word 'security' by it."
also Renault dealer can find out the code for that radio.

i copied and pasted this from a friend from the sterio installation bay at best buy
hope this infor helped

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