Just bought used 940 and at some point power was removed and radio is looking for the code. Went to dealer and got 6-digit code (yes 6) from VIN and also double checked it by using radio serial number (when I couldn't get code to work). When first turn it on display asks for code, I enter the 6 digits and nothing happens. If I turn it off and back on after entering that code, it displays what appears to be "rep" (repeat??). I enter it again and nothing. Of course it shuts down (displays "off") for a while after couple more tries. Am I missing a step or another button in the process??