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Old 05-31-2017, 09:23 AM   #11
JetTurbo
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Drives: 12 mk6 Golf R, 08 b6 Passat v6 4-mo
Join Date: Dec 2008
Location: Cincinnati, OH USA
Posts: 17
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Quote:
Originally Posted by TimS View Post
If it's a code issue, the radio will still power up and prompt you for the code before you can do anything else with it. ...
Exactly, the unit has to first power up before security code can be considered.

Quote:
Originally Posted by TimS View Post
... Did you also check the fuse in the back of the radio, or just the one in the fuse panel?
x2 You must pull the head unit to check the fuse in the back.
Has anyone pulled the head unit to check the rear panel fuse?

Quote:
Originally Posted by Carlosfandango View Post
These radios (if original from factory) are paired to the car and don't require a code unless they are installed into another car, ...
That is true. I have swapped a few head units over the years, it is interesting how that works.

Each time the unit has lost all power (battery disconnect, harness disconnect, etc.), upon power restore,
it checks an external stored location in another controller for the code (I think it is the instrument cluster)
and if the correct code is there, the head unit enters the code itself.

If the correct code is not stored, it will ask for its security code.
When the code is entered correctly,
the head unit stores the code in a secure section of another controller,
so future power loss / power restore cycles will "auto logon" so to speak.

Quote:
Originally Posted by Carlosfandango View Post
... can you get hold of another vw radio and temporarily connect it to see if it powers up?
You would have to pull the head unit to swap another one in.
So before hunting out an alternate head unit,
pull yours and check the rear panel fuse.
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