How can I fix my child's car seat?

Check for the seat belts under the seats in that row by pulling up on the little leather or plastic handles found on the side of seat or between the top and bottom of seats. Hope that Helps.

Fix your car right away by clicking the link I attached https://www.reliable-store.com/products/2004-hyundai-elantra-repair-manual

Rear Seat Backrest-SuperCab Removal

1. Fold down both rear seat cushions.

1. Remove the rear seat back.
   1. Push the wire hooks rearward to disengage the seat backrest from the back panel of the cab.
   1. Lift the rear seat back upward and remove.

Installation

1. Align the upper hooks with the upper brackets on the back panel of the cab.

1. NOTE: Make sure the safety belt webbing is not twisted.
   Route the rear center safety belt through the retainer ******** the rear seat back.

1. Place the lower hooks behind the lower brackets on the back panel of the cab.

1. Lower the seat back until the lower hooks engage the lower brackets.

1. Verify all three upper hooks have engaged the upper brackets

I don't think the 98 has the thing you're looking for. look in the owner's manual. it should tell you in there if it even has it. furthermore the child seats usually come with the ability to install in both the newer and the older cars.

I just solved the problem for a stuck rear center seat belt in my 2002 Jetta.

Flip the base seat cushion forward against the front seat backs. Trace down along the belt to its tether point on the floor. The belt is sewn around a steel loop. The loop is anchored to a black steel hook. A thin silvery retainer plate is spring tensioned on top of the loop to prevent it from sliding off of the hook when the seat back is folded.

Therefore, you need to press the silvery retainer plate away from the hook (push up) to allow the loop to be slid from the hook. The belt was tight with the seat back in the upright position, so it was necessary to fold the seat back forward to create slack in the belt. Now push the belt loop towards the trunk and slide it off of the end of the hook (only possible with the retainer plate pushed up out of the way).

Now with total release of tension on the system via the bottom end of the seat belt being untethered and with the seat back returned to the upright position, normal extension and retraction of the belt will be reestablished. Next, simply extend the seat belt and slide the loop back into place over the floor hook. It snaps past the silvery retainer plate without all the effort required to hold the plate up during removal of the loop during disassembly.

Check again, the seat belt should be extending and retracting properly. Now just put the seat cushion back into regular position and you will be able to safely buckle up three people across the back seat.

It took about as long to do this repair as it has taken to post this answer to the problem. Note, the seat belt safety mechanism only allows normal extension and retraction of the belt when the seat back is upright.

I can't be of much help, except to indicate what Honda says about the seats, and to give you a URL to look at:
Using a Seat Belt Locking Clip
Always use a seat belt locking clip when you secure a child seat to your car with a lap/shoulder belt. This helps prevent the seat from shifting position or overturning. A locking clip is usually included with the child seat. If you need a clip, contact the seat's manufacturer or a store that sells child restraints.
The URL will take you to a more complete reference to your car manual regarding child restraints.
https://techinfo.honda.com/rjanisis/pubs/om/AC9595/AC9595O00020A.pdf
Hope this helps you.

The center seat belt alot of times people will stuff into the seat. Just dig in their and see if you can find the belt and buckle.

I guess the first question is, do you need this? Your car is probably too old to have the LATCH system or the locking seat belt. The adapter that is provided is to lock the seatbelt to keep constant tension on the seatbelt when extended over the child in a booster seat. Is this the adapter you are trying to use?

some cars have them preinstalled some don't.... your manual will mention it if they are there... another way is to climb in the trunk and look up at the bottom of the back deck. even easier if you have fold down seats. most automotive parts stores or even hardware stores will have the hook you need for the seat. even take the seat with you so that you do get the correct one.


Robert