How do you remove the rear seat of 2004 honda accord

The rear seat is four (4) pieces.
You will need two tools a 6mm and 8mm wrenches.
1.) Unbuckle the rear seat belts. 2.) Locate the bolt in the center part of the rear seat, between the cushion and the seat-back. Remove the bolt with a 6 mm socket wrench. 3.) Push down firmly on the front edge of the rear seat cushion and pull it toward you to unhook and remove the rear seat cushion. Push the seat belt stalks through the center holes and lift the cushion out of the Accord. 4.) Pull the lever on the side of the rear seat bolster to lower the rear seat-back, which must be in the down position to access its bolts. 5.) Slide the center seat belt toward the passenger side of the vehicle. Move the loop over the edge of the seat-back to prevent it from hindering removal. 6.) Remove the three bolts from the bottom edge of the rear seat-back, using an 8 mm socket wrench. One bolt is in the center; the other two bolts are on either side. 7.) Pull the rear seat-back out of the Accord. The remaining sections of the seat should be the two side bolsters. 8.) Remove the bolts from the bottom of the side bolsters with a 6 mm socket wrench. Push firmly against the first side bolster. Push it upward to slide it out of its mount. Repeat the process on the bolster on the other side to finish removing the Accord's rear seat.

This should take approximately 15-30 minutes depending hoe mechanically inclined a person is.

Step 1 Remove the center console cover around the parking brake lever located inside the car between the driver's seat and the front passenger seat.
Step 2 Turn the adjuster nut with your wrench or pliers located at the end of the parking brake cable rod, to loosen the adjuster nut. Make sure it doesn't come off the end of the parking brake cable rod.
Step 3 Raise your Honda Accord rear wheels in the air using your jack and support both rear wheels with your jack stands.
Step 4 Pull up on the parking brake handle for two notches or clicks. Tighten the adjuster nut until there is a slight resistance on the rear wheels when they are spun.
Step 5 Release the parking brake lever. Verify the rear wheels do not have resistance and are able to spin freely.
Step 6 Pull up on the parking brake lever three to five notches and verify the rear wheels do not turn at all.
Lower your Honda Accord using the jack and remove the jack stands from the rear wheels.
Items you will need

• Wrench or pliers
• Jack and jack stands

Buy second hand cheap seat. Not common that I know of.

It is probably a faulty seat belt sensor located underneath the seat.

I believe this procedure applies to your 94 Accord:
With your hands, press down on the seat cushion where it meets the seat back. Locate the retaining bolt(s). Some models retain the seat with one bolt in the center; others use two, evenly spaced left and right.
Remove the retaining bolt(s).
Lift the back (toward the rear of the car) of the seat bottom upwards while rotating it toward the front of the car.
Disconnect the hooks at the front edge (during the rolling motion) of the seat and remove the seat bottom.
Remove the carpet (in the luggage compartment) from the rear of the seat backs.
Remove the seat back mounting bolts from the luggage compartment side.
Lift out the seat back.
If the rear side bolsters or pads are to be removed, remove the lower mounting bolt, then push upward to free the hooks.
Hope this helps you.

With your hands, press down on the seat cushion where it meets the seat back. Locate the retaining bolt(s). Some models retain the seat with one bolt in the center; others use two, evenly spaced left and right.
Remove the retaining bolt(s).
Life the back (toward the rear of the car) of the seat bottom upwards while rotating it toward the front of the car.
Disconnect the hooks at the front edge (during the rolling motion) of the seat and remove the seat bottom.
Remove the carpet (in the luggage compartment) from the rear of the seat backs.
Remove the seat back mounting bolts from the luggage compartment side.
Lift out the seat back.
If the rear side bolsters or pads are to be removed, remove the lower mounting bolt, then push upward to free the hooks.
Hope this helps you.

As I remember, you need to remove the front seat belt mount, & completely remove the back seats, in order to remove the rear door cards, without breaking them.
Have fun;)

Take this back to your local honda dealership. Honda has a lifetime seatbelt part warranty. They should take care of this no problem for you at no charge.

It's a lot of work for just cleaning.
Fold the rear seat down and remove the two 12mm bolts on the bottom corners of the seat back, pull the seat out.
Between the seat bottom and the carpet you will find two tabs you need to pull and then pull the seat bottom up and out of the car.
Remove the two 10mm bolts securing the seat bolsters to the area the seat bottom was covering. Pull the seat bolsters up and out of the car.
Pop the "C" pillar trim off of the car (above the parcel shelf and beside the rear glass) (side airbag vehicles have a slightly different procedure.)
Pull up on the parcel shelf carefully and evenly. Remove clean and put everything back together.