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The rear speakers in my celica have been blown ever since I got it, but my searches did not come up with any information on how to replace them, how to remove the quarter interior trim, or even what size they were.....
So. My wife and daughter were out of town last week, so I did some exploratory surgery, and replaced them. Here's what I found. If you have a convertible, and have worked on it at all, you are probably familiar with the coach-built quality of these, so there's a decent chance that some of this will be different, but it's probably pretty accurate.
Tools: Philips screwdriver, flathead screwdriver, trim stick (careful use of a flathead acceptable), 10mm socket, 12mm socket, maybe 14mm socket. (obviously I did it with an impact driver, but hand tools are just fine).
20170711_191117~01 by Numbchux, on Flickr
I did this with the top and windows down to really make it easy to get at everything, but most of it could be done with the top up.
Fold the back seat down, and un-do the 2 12mm bolts to remove it from the hinges:
20170711_191143 by Numbchux, on Flickr
Pop the back of the sill molding off and pull it off to one side (doesn't have to be removed completely, but the back overlaps the quarter molding).
20170711_175047 by Numbchux, on Flickr
20170711_175101 by Numbchux, on Flickr
Remove the rear seat base. It's just clipped in at the front, and then will lift free.
Then gently pry the speaker grill off.
20170711_174349 by Numbchux, on Flickr
There are 5 larger phillips screws in the interior side of the panel (one behind the speaker grill, 2 covered by the seat bottom, and 2 by the seat back (one of those is hidden behind the hinge in this picture))
20170711_174552 by Numbchux, on Flickr
Remove the 4 10mm bolts that hold the seat hinge and latch on, and remove them.
Pry the little cover off the 3 smaller screws on the back edge of that panel:
20170711_174739 by Numbchux, on Flickr
And remove them:
20170711_174806 by Numbchux, on Flickr
Then to the top edge of the panel. There's a screw hidden by the front seat belt:
20170711_174515 by Numbchux, on Flickr
There are 2 snaps (presumably for the hard cover), the outer one is just screwed into the plastic, but the inner is screwed into the structure of the car, and will have to be removed.
20170711_174452 by Numbchux, on Flickr
For the last 2 screws, the top will have to be folded most of the way down (or part of the way up).
20170711_175007 by Numbchux, on Flickr
Then the panel lifts off pretty easily. Then it's just 4 screws that hold the speaker to the frame. It is glued in, as well, so will take a bit of prying, but not too bad.
20170711_175530 by Numbchux, on Flickr
I used these 4" speakers to replace the old ones:
https://www.amazon.com/gp/product/B00I4D2YBI/ref=oh_aui_detailpage_o02_s00?ie=UTF8&psc=1
They were a direct fit. The screws lined up perfectly, and the wiring was an exact swap.
20170711_175755 by Numbchux, on Flickr
I'm extremely happy with the results. I'm no audiophile, so they're probably not the greatest thing out there, but what do you expect from a 4" speaker?
So. My wife and daughter were out of town last week, so I did some exploratory surgery, and replaced them. Here's what I found. If you have a convertible, and have worked on it at all, you are probably familiar with the coach-built quality of these, so there's a decent chance that some of this will be different, but it's probably pretty accurate.
Tools: Philips screwdriver, flathead screwdriver, trim stick (careful use of a flathead acceptable), 10mm socket, 12mm socket, maybe 14mm socket. (obviously I did it with an impact driver, but hand tools are just fine).

I did this with the top and windows down to really make it easy to get at everything, but most of it could be done with the top up.
Fold the back seat down, and un-do the 2 12mm bolts to remove it from the hinges:

Pop the back of the sill molding off and pull it off to one side (doesn't have to be removed completely, but the back overlaps the quarter molding).


Remove the rear seat base. It's just clipped in at the front, and then will lift free.
Then gently pry the speaker grill off.

There are 5 larger phillips screws in the interior side of the panel (one behind the speaker grill, 2 covered by the seat bottom, and 2 by the seat back (one of those is hidden behind the hinge in this picture))

Remove the 4 10mm bolts that hold the seat hinge and latch on, and remove them.
Pry the little cover off the 3 smaller screws on the back edge of that panel:

And remove them:

Then to the top edge of the panel. There's a screw hidden by the front seat belt:

There are 2 snaps (presumably for the hard cover), the outer one is just screwed into the plastic, but the inner is screwed into the structure of the car, and will have to be removed.

For the last 2 screws, the top will have to be folded most of the way down (or part of the way up).

Then the panel lifts off pretty easily. Then it's just 4 screws that hold the speaker to the frame. It is glued in, as well, so will take a bit of prying, but not too bad.

I used these 4" speakers to replace the old ones:
https://www.amazon.com/gp/product/B00I4D2YBI/ref=oh_aui_detailpage_o02_s00?ie=UTF8&psc=1
They were a direct fit. The screws lined up perfectly, and the wiring was an exact swap.

I'm extremely happy with the results. I'm no audiophile, so they're probably not the greatest thing out there, but what do you expect from a 4" speaker?