GM Bonneville/Eighty Eight/LeSabre 1986-1999

Power Seat Motor

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REMOVAL & INSTALLATION



See Figures 1 and 2

The six-way power seat adjusters are actuated by three 12V, reversible permanent magnet motors with built in circuit breakers. The motors drive the front and rear vertical gearnuts and a horizontal actuator. When the adjusters are at their limit of travel, an overload relay provides stall torque, so the motors are not overloaded. Each motor can be serviced as a separate unit.

  1. Disconnect the negative battery cable.
  2.  
  3. Remove the seat assembly from the vehicle as outlined in this section.
  4.  
  5. Remove the adjuster assembly from the seat.
  6.  
  7. Detach the feed wires from the motor.
  8.  
  9. Unfasten the nuts securing the front of the motor support bracket-to-inboard adjuster. Partially withdraw the assembly from the adjuster and gearnut drives.
  10.  
  11. Remove the drive cables from the motor. Completely disassemble the support bracket with the motors attached.
  12.  
  13. Grind off the peened-over ends of the grommet assembly securing the motor-to-support. Separate the motor from the support.
  14.  

See Figure 1

Click image to see an enlarged view

Fig. Fig. 1: Six-way power seat assembly

To install:
  1. Drill out the top end of the grommet assembly using a 3 / 16 inch (5mm) drill bit.
  2.  
  3. Install the grommet assembly-to-motor support bracket. Secure the motor with a 3 / 16 inch (5mm) rivet.
  4.  
  5. Install the drive cables.
  6.  
  7. Install the motor-to-inboard adjuster.
  8.  
  9. Connect the motor feed wires and negative battery cable.
  10.  
  11. Install the adjuster assembly-to-seat bottom.
  12.  
  13. With an assistant, install the seat and check for proper operation.
  14.  

ADJUSTMENT



Horizontal Actuator

See Figure 2

  1. Operate the seat to its full up position and about 3 / 4 full forward.
  2.  
  3. Loosen the 2 actuator screws.
  4.  



Click image to see an enlarged view

Fig. Fig. 2: Horizontal actuator adjustment

  1. Pry out and, at the same time, energize the horizontal switch to move the seat fore and aft slightly.
  2.  
  3. After the gear teeth free-play has been eliminated, maintain the outward pressure and tighten the 2 actuator screws.
  4.  

 
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