Hey guys, I have seen quite a few people with window problems, especially the rear. While the problem may be many things, if you follow the instructions in some of the other posts and eliminate the other possible causes, (i.e. relay, wiring, etc.), I have a pretty handy fix for the switch. The rear control switch, especially on the 1st gen T4R's, was very susceptible to getting gunky, and wearing out. You can actually repair the switch if it isn't too far gone as opposed to hunting for days in junkyards or trading your firstborn to auto clone for a new one. This has worked on both my 85 and 89...
Carefully pop the switch out of the console, with the ignition off, and gently pull the slack from the wires. This should give you a decent amount of working room. Using a small punch or a nail, (the lead on my multi meter was a perfect fit for me) push the small roll pin holding the top of the switch out. Be careful, as the switch has a spring under it that can send it far away, and the spring is a real pain to find. Set the switch top, spring and the small white plastic piece aside in a safe place. Now, using a small flat head, gently turn the white catch for the bulb on the side and remove the bulb. Using the flat head again, gently release the catches on either side of the base of the switch and pull the outer part away. Again, be careful, because there is a copper rocker in there that is hard to find if you drop it. Once it is all apart, use a small screwdriver, knife, or whatever to clean all of the contact points on the inside of the switch and on the rocker piece. You will probably notice a good bit of corrosion on them. Once you get them all cleaned off, carefully reinstall the outer cover of the switch and put the rocker back in place. You know you have it right when the small tabs on the side sit in the U shaped pieces of the switch base, and the curled ends face down. This is tricky, and I found the easiest way was using a pair of needle nose pliers once the cover was back on the base. Once you have that in place, take the small spring from the top and stretch it SLIGHTLY. Don't overdo this, or the switch won't work right. After you do that, carefully put the switch top back on with the spring and white piece in place. That is probably the most ticklish part, and requires steady hands and some patience. Make sure that the white piece is directed to the center of the copper rocker when you put it in. Afterwards, replace the roll pin, and test the switch.
I found this works well when you are having intermittent problems with the window, or it will only go one direction when controlled from the front. This isn't a guaranteed fix, and you can break your switch, but if you were planning on buying a new one, you haven't really lost anything. Good luck!
Carefully pop the switch out of the console, with the ignition off, and gently pull the slack from the wires. This should give you a decent amount of working room. Using a small punch or a nail, (the lead on my multi meter was a perfect fit for me) push the small roll pin holding the top of the switch out. Be careful, as the switch has a spring under it that can send it far away, and the spring is a real pain to find. Set the switch top, spring and the small white plastic piece aside in a safe place. Now, using a small flat head, gently turn the white catch for the bulb on the side and remove the bulb. Using the flat head again, gently release the catches on either side of the base of the switch and pull the outer part away. Again, be careful, because there is a copper rocker in there that is hard to find if you drop it. Once it is all apart, use a small screwdriver, knife, or whatever to clean all of the contact points on the inside of the switch and on the rocker piece. You will probably notice a good bit of corrosion on them. Once you get them all cleaned off, carefully reinstall the outer cover of the switch and put the rocker back in place. You know you have it right when the small tabs on the side sit in the U shaped pieces of the switch base, and the curled ends face down. This is tricky, and I found the easiest way was using a pair of needle nose pliers once the cover was back on the base. Once you have that in place, take the small spring from the top and stretch it SLIGHTLY. Don't overdo this, or the switch won't work right. After you do that, carefully put the switch top back on with the spring and white piece in place. That is probably the most ticklish part, and requires steady hands and some patience. Make sure that the white piece is directed to the center of the copper rocker when you put it in. Afterwards, replace the roll pin, and test the switch.
I found this works well when you are having intermittent problems with the window, or it will only go one direction when controlled from the front. This isn't a guaranteed fix, and you can break your switch, but if you were planning on buying a new one, you haven't really lost anything. Good luck!
