Ford 2009 F-150 Owner's Manual page 240

Tires, Wheels and Loading
TPMS reset procedure
It is recommended that you read the entire procedure before attempting.
Note: To enter the reset mode, Steps 1–6 MUST be completed within
60 seconds.
1. Place the ignition in the off position and keep the key in the ignition.
2. Press and release the brake
pedal.
3. Cycle the ignition from off to on
three (3) times ending in the on
position—DO NOT start the engine.
240
2009 F-150 (f12)
Owners Guide, 2nd Printing
USA (fus)