If the airbag readiness lamp is lit, do the following

The driver and/or adult passengers should check for any objects that may be lodged underneath the front passenger seat or cargo interfering with the seat.
If objects are lodged and/or cargo is interfering with the seat; please take the following steps to remove the obstruction:
• Pull the vehicle over.
• Switch the vehicle off.
• Driver and/or adult passengers should check for any objects lodged
underneath the front passenger seat or cargo interfering with the seat.
• Remove the obstruction(s) (if found).
• Restart the vehicle.
• Wait at least two minutes and verify that the airbag readiness lamp is
no longer illuminated
• If the airbag readiness lamp remains illuminated, this may or may/not
be a problem due to the front passenger sensing system.
DO NOT attempt to repair or service the system; take your vehicle immediately to an authorized dealer.
If it is necessary to modify an advanced front airbag system to accommodate a person with disabilities, contact the Ford Customer Relationship Center at the phone number shown in the Customer Assistance chapter of this Owner’s Guide.
WARNING: Any alteration/modification to the front passenger seat may affect the performance of the front passenger sensing system.
Determining if the system is operational
The supplemental restraint system uses a warning indicator light in the instrument cluster or a back-up tone to indicate the condition of the system. Refer to the Warning lights and chimes section in the Instrument Cluster chapter. Routine maintenance of the airbag is not required.
A difficulty with the system is indicated by one or more of the following:

• The readiness light (same light
for front and side airbag system)
will either flash or stay lit.
• The readiness light will not
illuminate immediately after ignition is switched on.
• A series of five beeps will be heard. The tone pattern will repeat
periodically until the problem and/or light are repaired.
If any of these things happen, even intermittently, have the supplemental restraint system serviced at an authorized dealer immediately. Unless serviced, the system may not function properly in the event of a collision.
See also:
Underbody
Flush the complete underside of your vehicle frequently. Keep body and
door drain holes free from packed dirt. ...
Headlamp control
Turns the lamps off.
Turns on the parking
lamps, instrument panel lamps,
license plate lamps and tail lamps.
Turns the headlamps on.
...
Third generation
The 2007 Navigator was unveiled at the Chicago Auto Show in February 2006. It
is joined by a long wheelbase Navigator L based on the Expedition EL and shares
the new Ford T1 platform with that veh ...
