My girlfriend has a 1999 Taurus that she has had since it was 2 - 3 years old. To start the car she must turn the key to the "ON" position and then press the "RESUME", "SET ACCEL" and "COAST" button on her cruise control. She can then proceed to start her car.

If you try starting the car without pressing these 3 buttons, the key turns to the "START" position but nothing happens. Her son discovered that by depressing the "REAR DEFROSTER" button on the dash achieves the same thing.

I am not a Ford guy, nor could I find anything on the internet by trying to Google this. Any thoughts on how to correct or disable this issue would be greatly appreciated.

Thanks in advance.