I apologize for my previous post: One should never attempt a technical post when about to go to sleep. The sequence described earlier was what I used for my 300C. The correct procedure for the Crossfire is as follows: 1)Turn key to ON/START - within 60 seconds, turn ignition OFF and fasten the driver seat belt. 2)Start engine and wait for the seat belt light to turn off. 3)Within 60 seconds unbuckle/rebuckle the seat belt 3 times - ending with buckled. 4)Turn the engine OFF and wait to hear a single chime. (This confirms you have turned the repeater chimes off. Repeat the sequence or disconnect the battery to restore the reminder function.)