I had to remove the battery for my car because it was dead, however when I replaced the battery my radio did not turn back on. I have a 2005 VW Jetta GLI
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It's likely there is a security code for the radio which since being "disconnected" thinks the battery has been removed. Check with dealer by vin. They probably have the security code in their system.
Have you checked the radio fuse? You may have blown the fuse when you jumped the car. The fuse box should be out under the hood encased in black plastic.
If you live where it is cold, your battery may need to be replaced . They will discharge with the cold during the night. Try changing the battery or checking your curent one. Install a known good battery that you know is fully charged, start the car and then turn it off leaving it for the night. If it does not start in the morning then you know it is not the battery. More than likely the alternator or regulator.
I have this same issue, it is not code related, I have a code and the radio works just fine WHEN THE CAR IS OFF. As soon as the engine starts, the radio loses power, did you ever find a solution to this?
My wife's 2001 Jetta TDI had the same problem. First we changed the battery. (It was just about due anyway) No change. We then traced the power drain to the in-trunk mounted CD changer. This was an aftermarket CD changer but we went to the same source that the VW dealership uses. Of course one blames the other. The CD changer was even replaced with no change. If we are not using the car for long trips we unplug the CD changer and no more dead battery! Neither the VW dealer nor the AV installer could give us a good working solution to this problem.
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