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I am working on a replacement motor that will come with a new gear/shaft on it. I have one of my setups in the car right now and have the parts for another one ordered. I hope to make a video of the repair in a couple weeks when the parts show up. Still uses plastic gears, but these are larger, more durable gears and the swap is fairly straight forward with just a few modifications.
Lift the front edge of the seat bottom by using the regular power seat switch. Take voltage readings of the seat slide motor.2 Verify that the voltage to the seat slide motor on the harness side between "BR" and "W/B" is 12v when the power seat's switch is pressed backwards and forwards. Jot down your radio presets and tap the seat slide motor so that the motor will work long enough to give you access to the seat mounting bolts.3 Pull the seat as forward as it will go. Take off the two M10 rear seat mounting bolts and set them aside. Push the seat as far back as it will go. Take off the two M10 front seat mounting bolts. Switch the ignition so that it marks "OFF." Unplug the negative battery cable. Stand by for 4 minutes. Raise the seat assembly to find the harness-to-seat connectors. Disconnect them.4 Take out the entire seat assembly and place it on a dry, clean, flat surface. Position it so you can access the bottom of the seat. Undo the seat bottom's carpet flap and take out the four M8 bolts. Then, take out the top screws from the right hand and left hand side finishers. Unplug the seat sub-harness connector.5 Put both the seat rails back into their rear position and take out the worm gears, motor, flexible wire and gear boxes all at the same time. Take out the flexible wire from the gear boxes using a screwdriver. Verify that the new seat track mounting tab makes contact with the rear stopper and that the threaded shaft facing up is point upwards. 6 Install six new rubber grommets. Place the new worm gears, flexible wire and gear boxes into the frame. Reposition the seat tracks over the seat track mounting tabs. Use your hand to tighten the M6 bolts securing the seat track mounting tabs. Torque the six base plate nuts securing the gear boxes to 64 to 85 inch pounds (7.17 to 9.69 Nm) and the M8 bolts on the seat's front edge to 13 to 17 foot pounds (17.5 to 23.7 Nm).7 Plug the slide motor connector back in and hook the carpet flap's strap. Reinstall the seat assembly and reconnect the electrical connectors and negative battery cable. Torque the mounting bolts to 27 to 36 foot pounds (37 to 49 Nm). Operate the seat to make sure that the problem has been resolved
The seat track you need will have to either need power or be aligned so you can reach its' mounting bolts too. You will be able to see how the gear drive is attached on the replacement seat track. You may be able to unbolt the gear drive from the track on your damaged part. Then the seat should slide either way without the drive gears stopping you from moving the seat. Sometimes there is only room for a air ratchet to fit as the bolt can spin without having to move the ratchet handle.
The position of the roof is determined by a pair of small electronic switches pushed up against a gear ajacent to the gear that drives the roof back and forth.
When "calibrating" the roof position to the logic (controller) You need to seperate the motor from the roof asy. command it wide open, then manually slide your roof open. Once close, use a flat-head scrwedriver to push the cords where the gear normally would the rest of the way to the alignment marks.
This is located near the back of the track, the two silver hatch marks on the plastic tilt slide should be just behind the track opening if I'm remembering correctly.
Once everything is lined up, it should work great. If your off by a tooth or two, pull the motor, and move it with the scewdriver, and try again.
There are plastic gears connecting the track to the seat assembly. Whne one of these strip the seat will only work or move to one side. Infiniti does not sell a simple fix. You are looking at buying an entire seat assembly complete with the module for all the electronics. It will be at a cost of around $950 - $1000. Once that is in, Infiniti must program the seat to the brain of the car, only then can you reset your memory settings.
Most of the time its the little worm gear that went bad not the switch (the gear is slipping on the fixed bracket) I pushed back on the seat real hard and hit the switch and Mine went back finally, the track/motor assembly will have to be replaced(250 from Ford) Very Common problem .-----------------------to remove the seat First disconnect the connectors under the seat. Remove the 3 bolts (Front Left, Front Right, Rear Right). Remove the nut from the Left Rear. Lift seat up and out. thanks.