Switch Radio On - Display Shows " FIAT " Followed By " CODE " Rotate RH Tuning Knob to Select 1st Digit Press RH Tuning Knob to Enter Rotate RH Tuning Knob to Select 2nd Digit Press RH Tuning Knob to Enter Rotate RH Tuning Knob to Select 3rd Digit Press RH Tuning Knob to Enter Rotate RH Tuning Knob to Select 4th Digit Press RH Tuning Knob to Enter If the correct code number is now shown Rotate RH Tuning Knob To Select " OK " Press RH Tuning Knob to Enter