From the F-150 Forums, since I just bought one and this worked!
This is straight from my 2009 f150 owners guide
Preperation
1. the parking brake is set
2.
truck in park
3. ignition switch is in off position
4. both
seat belts are unbuckled
Disable Belt-Minder1. turn the ignition switch to the on position, DO NOT START THE ENGINE.
2. wait until the
safety belt warning light turns off. (approximately 1 minute).
* step 3 must be completed within 50 secs after the safety
belt warning light turns off.
3. buckle then unbuckle the
seat belt nine times, ending in the
seat belt unbuckled.
* after step 3 the restraint warning light, (airbag light) will turn on for three (3) seconds.
4. within approximately seven (7) seconds of the light turning off, buckle then unbuckle the safety
belt.
* the restraint system warning light will flash four, (4) times per second for 3 seconds for confirmation
you can do this for the passenger side also!!!
*NOTE in step 3. after three times buckling and unbuckling the restraint warning light lit up in my truck.
SO I WENT TO THE NEXT STEP, (STEP 4). waited 3 seconds and i buckled and unbuckled.
in the buckle /unbuckle procedure do it some what slowly and watch for the light. it may not take 9 times.
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