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most gm vehicles have a two piece back seat; you have to remove the bottom first. there are two screws on a little vertical section of floorboard under the front of the seat; remove them, then push the seat back just a little and remove the lower section. then you will see two more screws which hold the backrest; when you remove them just lift up and remove the backrest. you can reinstall the lower section if you want.
You will have to remove the backseat. First the bottom part, it has two pull cords to release the seat. Take that out. Then for the back part, you will have to remove 4 nuts (2 with washer looking things attached and the ones holding the seatbelts) at the bottom of the seat. After removing them, where you had removed the seatbelt nuts, you will have to remove the seatbelt peices. Once that's done, you will have to pull the seat out and up. Behind that, there is 2 round button anchors, which you will have to pull out. Once those are removed, the whole back peice comes out, exposing the rear speakers. They should be 1/4 bolts holding the speakers in. And if you are modifying (not using stock speakers), you may have to cut they wires to replace the speakers.
Same proceedure as front headrests but tilt the back of the seats forward about halfway. Push the little clip in on top of the seat, by the chrome rail, pull the headrest up and slide out of the hole. Push the back of the seat back, lift up the bottom seat and tilt forward. Lay the back seats down. Done.
I have a 1990 with the same problem and the solution is quite easy but delicate at the same time. The outside of the speaker has a "snap on" and thus carefully pry off "cover". Once off you can easily see the screws which hold the actual speaker in place. Speaker wire clips are easy to undo. Very simple R & R once the cover is off. Be careful when you snap the cover back into place.
hi sometimes on most cars if lift up the back seat ther usually the pump unit on the top of the tank with two pipes coming out of it .if ypu can find the relay for the fuel pump connect the terminals 30 to 87 together you should hear the fuel pump run.alternitavely check the power to the fuel pump with a multimeter you should get 12 volt when trying to start also check for broken wirig to pump.
On your 91 Lexus ls 400.
If you remove the Rear passanger seat.
You will have axces to the fuel pump.
Remove the metal cover . Disconnect the wire harnes,
Disconnect the lines.
removing the nuts you will able to remove the fuel pump.
Ok.. I hope this help on your question.
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