Honda Prelude 1990 Online Reference Owner's Manual page 13

Do not wear the shoulder portion of the belt under your arm or
out of position. Such use could increase the chance and amount
of injury in an accident.
Never use one belt for more than one person, child or adult.
Comfort clips sold on the open market are not recommended
since they could impair the function and safety of the belts.
Front Seat Belt Warning Light and Warning Beeper
There are four warning lights in the car. Two of them are in the
instrument panel and the other two lights are in the ceiling behind
the rearview mirror. Each warning light will go on for about two
seconds, when the ignition switch is turned on.
PASSENGER'S BELT UNLATCHED
DRIVER'S BELT UNLATCHED
EITHER DOOR OPEN
DRIVER'S BELT
UNLATCHED
Warning Light indicators
Either Door Open — The warning light will come on if either
door is open. The beeper will sound for approximately six seconds
while the light is ON. Confirm which door is open and close the door
completely. If either door is opened while the car is being driven, the
beeper and all four warning lights will come on. Stop the car
immediately and close whichever door is open. The warning light
should go off.
WARNING LIGHT
WARNING LIGHT
(cont'd)