Honda 1991 Prelude Owner's Manual page 16

Warning Light Indicators
Either Door Open
The warning light in the instrument panel will come on when the
ignition is switched on. The beeper will also sound for approximately
six seconds. Confirm which door is open and close the door
completely, the light will go out.
If either door is opened while the car is being driven, the beeper and
all four warning lights will come on and stay on. If this happens, pull
off the highway, stop the car immediately and close whichever door
is open. The warning lights and beeper should go off.
Driver's Belt Unlatched
The warning lights in the ceiling and in the instrument panel will
come on and stay on if the driver's belt is not latched. The beeper
will sound for approximately six seconds when the ignition is turned
on. Relatch the belt; the light should go off.
Front Passenger's Belt Unlatched
The warning light in the ceiling will come on and stay on if the front
passenger's seat belt is not securely latched, the beeper sound for
approximately six seconds. Relatch the belt; the light should go off.
If the lights and beeper do not function at all or if they come on
even with the belts latched and doors fully closed, it indicates a
malfunction in the seat belt system. In the event of a collision,
severe personal injury could result. The system should be checked
immediately by an authorized Honda dealer.
(cont'd)