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When you disconnect your battery and then reconnect it again, it disables the radio. This is an anti-theft protection for your car radio. The enable your radio the activation code is in your vehicle owner's manual. If you do not have this code you need to go to your Vauxhall service centre and get them to enter this code for you.
The units anti-theft program was activated when the battery was disconnected. If you don't know the 4 digit code, try to contact the previous owner or most higher end car audio dealer/installers will offer a service to reset the anti-theft code program, for a fee.