Grundig SC 303 D (C) - code

[michael_777]

Hello !

I have a situation that most of you I think had in the past...
From the beginning - Radio which I have mounted originally in my Opel Omega A - the old Blaupunkt (Freiburg sqr39)unfortunatelly died. A month ago I have talked with my friend and he told me that he has a old Grundig from his Opel Senator and he will give it to me (it was unused for years). I was happy but for a short time... it was coded and my friend lost a code. We tried to find code for this radio but without success So I have a beautiful (really in good condition) Grundig but it doesn't work.
I know that you're masters in electronics, for you it's a piece of cake... Could you tell me what is correct code to my radio?
Here are details of it:
Grundig SC303 D (C) - with removal panel with LCD display
No 90355877
GM1303P6564032
SC 303 D (C) 9.18209 G.SB 11-00

PS. I'm not able to read dump because I have to go to radio service in this case but in my place they will demage this kind of stuff in 5 sec but not repair it... so only way is calculate code by serial

many many thanks in advance for your help

have anice weekend!

bye
Michal

[tvzmaj]

I do not have the base GM1303.....
GM0303... is easy to find.