BMW 318/325/M3/525/535/M5 1989-1993 Repair Information

Power Seat Motor

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REMOVAL & INSTALLATION



E34 5 Series

See Figure 1



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Fig. Fig. 1: Power seat rails and drive motors-E34 5 Series

  1. Remove the seat from the vehicle. Disconnect the side panels by unclipping and removing the screws. Disconnect the switches.
  2.  
  3. Remove the seat control unit from under the seat. Use tool 52 1 100 or equivalent to drive out the 4 bearing pins.
  4.  
  5. Drill out the rivets and remove the base plate.
  6.  
  7. Remove the front seat height motor and remove the rails.
  8.  
  9. Remove the fore/aft motor.
  10.  
  11. Remove the backrest cover by removing the 2 screw at the sides, if equipped, and pushing the cover up to disengage the clips. Pull the cover off and disconnect the wiring.
  12.  
  13. At the lowers sides, press the levers down to disconnect the backrest. Pull the headrest out.
  14.  
  15. Loosen the headrest gearbox cover. Remove the bolts and take off the gearbox. Remove the motor from the gearbox.
  16.  
  17. Loosen the bottom seat cushion cover. Remove the bolts at the cable shaft retainer plate on the motor and remove the shafts.
  18.  
  19. Remove the screws and the snapring at the backrest fittings. Remove the motors.
  20.  

To install:
  1. Install the motors. The black plug is for the backrest position motor and the white plug is for the seat up/down motor.
  2.  
  3. Lubricate the splines for the backrest fittings and install the sleeve. Install the fittings and snapring.
  4.  
  5. Install the motor shaft and retainer plate. Install the seat cover.
  6.  
  7. Install the headrest motor and gearbox. Install the headrest.
  8.  
  9. Install the backrest on the seat bottom. Connect the electrical leads. The plug colors will match.
  10.  
  11. Install the backrest cover and screws.
  12.  
  13. Lubricate the splines and install the fore/aft motor. Connect the spring at the fore/aft motor before tightening the mounting nuts.
  14.  
  15. Install the seat front height motor. Check that the linkage is in the same position on both sides. Lubricate the splines and install the sleeves.
  16.  
  17. Install the base plate with new rivets or bolts. Install the 4 bearing pins with tool 52 1 100 or equivalent. Check that the retainer and stops are not damaged.
  18.  
  19. Install the control unit and the side panels.
  20.  

 
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