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Car radios have security codes to prevent them from being stolen. If they lose power, such as when replacing the battery, they lock out. This makes them worthless to anyone trying to steal them. You need to have the unlock code to reactivate the radio. It is provided with the vehicle at purchase, or by the retailer when selling replacements
I have exactly the same problem. Just changed battery today on 2002 VW Golf TDI, and the radio is completely dead. Checked the fuse - looks fine. (Fuse 42 incidentally. Fuses are on the side of the driver's dash facing the door ie. only accessible once the door is open). Anyone know why the radio has completely died?
Actually pull out the radio fuse for 15 seconds and then re-install. Mine usta just quit working once in a great while, and this was the fix. Radio fuse #42 if this is a "New Jetta A4 body" or fuse # 22 on an older "A3 body style"
try removing radio, ive had 3 impalas that drove me crazy! daignosing, they would drain the battery if car sat a weak,ending up being the radio shorting inside, dont know if thats your problem but i would start there, dont remove fuse have to remove the radio! hope this helps.
check if all the power leads have been connected to the battery, the maybe a small power connectiono that has fallen down the side of the battery when you changed it , this may solve it
If the battery went dead and you charged it, you need to reboot the system. It has lost them function of radio.
Disconnect both side of the battery and with the battery disconnected, crank the car 3-4 times (This just discharges the computers). Then reconnect the battery cables (pos + first) and you should have a working radio again.
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