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  • Repair Mini Cooper Electric Door Lock Actuator / Locking Mechanism

    I have followed this tutorial with great results. I am sharing this image that will make putting the actuator together a little easier and a few notes I think might be helpful to others.1) The bottom white plastic piece takes a lot of force to get it separated from the latch. Three white pins keep it in place, pry the metal plate to lift it so the pins get out of the holes (step 11 of tutorial). The white plastic clips are not very important, except for the one that is next to switch (top right of step 13 image)2)I found the plastic washer to be the problem since in both motors was melted, you can make it out of cardboard and put a dab of motor oil to place it in position and keep it lubed. Clean the motor with contact cleaner, The rotor contacts must also be cleaned with sand paper (10...see more »I have followed this tutorial with great results. I am sharing this image that will make putting the actuator together a little easier and a few notes I think might be helpful to others.1) The bottom white plastic piece takes a lot of force to get it separated from the latch. Three white pins keep it in place, pry the metal plate to lift it so the pins get out of the holes (step 11 of tutorial). The white plastic clips are not very important, except for the one that is next to switch (top right of step 13 image)2)I found the plastic washer to be the problem since in both motors was melted, you can make it out of cardboard and put a dab of motor oil to place it in position and keep it lubed. Clean the motor with contact cleaner, The rotor contacts must also be cleaned with sand paper (1000 grit). There are 3 contacts there and all must have a clean gap between them. There must be no trace there of the melted plastic, this will make the brushes of the motors skip produce sparks and heat the contacts more than normal. Before you assemble the motor, make sure the brushes are not angled in towards the center too much (they should be parallel to each other once the rotor is in), Failing to do this will result in sparks and overheating. When put properly, it will spark during test but after a few turns sparks will be reduce if at all present.3)You can test the motors placed on the white bottom piece by connecting the harness. Keep the switch described on step 1 here pressed while testing it. This tells the computer the door is closed. The motor in "horizontal position" (damaged) is the one that moves the unlock pin of the door up. The motor that sits at an angle (shown at the top on step 13 image) works to both lock and unlock. When you press the unlock button on the remote only this motor should spin, if you press the unlock button then both of the motors should spin, only this time the one at an angle will do it in the opposite direction. When everything is assembled both motors should work to lock and unlock since the two switches on the top left of step 13 image will be read. This switches are pressed when turning the key to lock or unlock manually, one reads the key when turned to the left and the other one when turned to the right.4)If your motor is plain dead, I found another tutorial that shows a motor that works. The Mabuchi FC-280PC-22125 found on bay for around $9 a pair (make sure to get the 20mm round shaft). I don't know if I am allowed to paste a link here, msg me if needed. Both motors in this actuator are the same, but the worm gear is not. Replacing the motor will require the removal of the gears anyway. When in place, the polarity of one motor is reversed so they turn in the opposite way to each other when needed. Again, replacing the motors will need more actions like cutting the shafts and reinserting the worm gear.

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