We lost the function of our radio in our 1992 525i due to loss of power. We bought the car used and it did not come with a radio manual. We know that the car was brought to the states by the original owner who was in the military. We are told we have a "european" radio - unlike anything the mechanics around here have seen. They are used to a 5 digit code and ours is only four digit - I believe we have the code but not the instructions on the sequence in which to re-activate the radio. Can anyone help with the instructions or tell me where I can get a hold of a replacement manual?