I recently bought a used BMW 1989 735ia. The dealer's swapped the car battery for me, and now my radio went to anti-theft mode. Two BMW service centers have been unable to help me, but I have high hopes for this board -- any help is appreciated. Car: BMW 1989 735ia VIN:WBAGB4316K3212621 Radio model pioneer KE-83 ZBM FCC ID AJD4DIKE-83ZBM Serial number: PIJ0104558