Supposedly the belt-minder system on the escape can be disabled, which of course is not recommended - but allowed. However, I think there's obviously a problem with the system, so this procedure might work, or it might not.
(Cut and pasted from itstillruns.com):
Step 1
Sit in the driver's seat of the Escape. Turn the engine off. Remove the key. Step on the parking brake pedal to set the parking brake. Unbuckle the seat belt.
Step 2
Insert the key into the ignition. Turn it to the "On" position but do not crank the engine. Allow enough time for the seat belt light to shut off; this takes about 60 to 90 seconds.
Step 3
Buckle then unbuckle the seat belt three times.
Look at the odometer. The warning light will come on again; then it will turn off. Immediately after it turns off, buckle and unbuckle the seat belt.