Seat belt light comes on but the belt is engaged...could it be a fuse?

These two faults maybe unconnected. Starting with the seat belt warning. There should be a switch in the seat to check if someone is sitting in it and a switch in the seat belt catch to check if the seat belt is engaged. If either of these switches or the wiring to them is faulty then the light will come on if the ignition switch is turned on. The airbag warning will come on if there is a problem with the explosive that operates the bag or wiring to it. I would check under the front seats of your car for wiring damage or a not fully engaged plug and socket. These can be damaged or work loose if things have been pushed under the seats.

The interior fuse box in a Pontiac Bonneville is underneath the backseat on the driver's side.

To remove the rear seat cushion:
1. Pull up on the front of the cushion to release the
front hooks.
2. Pull the cushion up and out toward the front of
the vehicle.

To reinstall the rear seat cushion:

1. Buckle the center passenger position safety belt, then
route the safety belts through the proper slots in the
seat cushion. Don't let the safety belts get twisted.
2. Slide the rear of the cushion up and under the
seatback so the rear - locating guides hook into the
wire loops on the back frame.
3. With the seat cushion lowered, push rearward and
then press down on the seat cushion until the spring
locks on both ends engage.
4. Check to make sure the safety belts are properly
routed and that no portion of any safety belt is
trapped under the seat. Also make sure the seat
cushion is secured.

Notice:
The battery and main fuse blocks are located
under the rear seat cushion. The battery's ground
terminal and some relay wires are exposed.
To help avoid damage to the battery and wires,
be careful when removing or reinstalling the seat
cushion. Do not remove covers from covered
parts. Do not store anything under the seat, as
objects could touch exposed wires and cause
a short.

The weight sensor in the seat is bad if this is the passenger seat. When you connect the seat belt, the sensor is disabled.

it sounds like the mat in the seat is have a error you need to take it to the dearler to get it fixed they will most likely need to replace the mat in the seat. sorry

It is most likely the door switch does the interior light come on when the door is opened if not replace the door switch, this switch also controls the seat belt motor.

haha, sounds like there are some wires crossed here, did you recently have any fuses switched out? Does the seat belt light come on when you run out of gas? hehe... That shouldn't be a difficult fix, would take a mechanic about 5 minutes if this is the case. Otherwise, keep your seatbelt buckled and it shouldn't bother you :-) have a nice day!

Check transfer case wiring, possible loose wiring/open circuit. If your other lights in dashboard work such brake light, seat belt lights, engine light than it is not a fuse. raise all for tires from the ground and engage the four wheel drive remember to have in neutral and put in gear either 4L or 4H and see if the wheels in front move.

Hi
There is a switch in the seat belt latch whe your sitting in the seat this will ba the part o the right side, see if something went into the latch part? or the switch is bad i think you have to replace the belt to fix the switch
RD