FORD 2002 Explorer v.3 - Manual (Page 167)

If any of these things happen, even intermittently, have the SRS serviced
at your dealership or by a qualified technician immediately. Unless
serviced, the system may not function properly in the event of a
collision.
Side air curtain system (if equipped)
Do not attempt to service, repair, or modify the air bag
supplemental restraint system, its fuses or the seat cover on a
seat containing an air bag. See your Ford or Lincoln Mercury dealer.
All occupants of the vehicle including the driver should always
wear their safety belts even when an air bag SRS is provided.
To reduce risk of injury, do not obstruct or place objects in the
deployment path of the inflatable curtain.
Seating and safety restraints
167