52 14 899 Additional work in event of faulty longitudinal adjustment drive

Necessary preliminary tasks: 

• Set seat tilt adjustment to max. up setting

Release screw (1) on actuator drive (2) of longitudinal seat adjustment.

Fig 1: Identifying Screw And Actuator Drive

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Release screw (1) on actuator drive (2) of longitudinal seat adjustment and detach actuator drive (2).

Operate button for longitudinal seat adjustment:

1. No function:
   • Disconnect plug for longitudinal seat adjustment
   • Connect new servodrive and check function
   • Gearing is OK if actuator drive runs
   • Assemble front seat
2. Actuator drive running:
   • Transmission for longitudinal seat adjustment defective!
   • Continue with disassembly of faulty gearing for longitudinal seat adjustment
     Fig 2: Identifying Screw And Actuator Drive

     Courtesy of BMW OF NORTH AMERICA, INC.

Removing faulty gearing (1) for longitudinal seat adjustment: 

1. (2) Input shaft
2. (3) Internal gearing
   Fig 3: Identifying Input Shaft And Internal Gearing

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Cut through drive shaft (2) from rear with pneumatic saw (1).

Fig 4: Identifying Drive Shaft And Pneumatic Saw

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Remove drive shaft (1) from gear (2).

Fig 5: Identifying Drive Shaft And Gear

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Release screw (1) and remove gear (2).

Fig 6: Identifying Screw And Gear

Courtesy of BMW OF NORTH AMERICA, INC.

Adjust front seat over rest of drive shaft (1).

Release screws on floorpan.

Remove front seat.

Replace seat mechanism on front seat.