67 31 500 Removing and installing/replacing forward/back seat adjustment drive unit

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Necessary preliminary tasks:

Raise front seat as far up as possible
Procedure in event of faulty drive for forward/back seat adjustment:
ADDITIONAL WORK in event of faulty drive for forward/back seat adjustment

Removing forward/back seat adjustment motor:

Unfasten plug connection (1) and disconnect.

Fig 1: Identifying Plug Connection

Courtesy of BMW OF NORTH AMERICA, INC.

Unlock retaining tabs.

Lift drive (1) with flex shaft out of guide in direction of arrow.

Pull flex shaft on left and right out of gearbox.

Fig 2: Lifting Drive With Flex Shaft Out Of Guide

Courtesy of BMW OF NORTH AMERICA, INC.

Installing forward/back seat adjustment motor:

Insert short flex shaft (2).

Attach rubber grommet (1).

Fig 3: Inserting Short Flex Shaft

Courtesy of BMW OF NORTH AMERICA, INC.

Installation note:

Attach rubber grommet at 60° angle to connector housing.

Fig 4: Identifying Rubber Grommet Installation Angle

Courtesy of BMW OF NORTH AMERICA, INC.

Insert long flex shaft (1) with sleeve tube (2) and rubber grommet in plastic part (3).

Fig 5: Inserting Long Flex Shaft With Sleeve Tube

Courtesy of BMW OF NORTH AMERICA, INC.

Installation note:

Attach Unified Parts Group to motor at 60° angle to connector housing so that it cannot twist.

Fig 6: Identifying Motor Installation Angle

Courtesy of BMW OF NORTH AMERICA, INC.

Slide seat rail with opening forwards or back until bushing for flex shaft mounting of worm gear is flush.

Insert flex shaft.

Fig 7: Sliding Seat Rail With Flex Shaft

Courtesy of BMW OF NORTH AMERICA, INC.

Fig 8: Identifying Short Flex Shaft And Long Flex Shaft

Courtesy of BMW OF NORTH AMERICA, INC.

Slide short flex shaft (1) into longitudinal seat adjustment gearing square.

Bend long flex shaft (2) upwards and slide into longitudinal seat adjustment gearing.

Clip motor and flex shafts into carrier plate.

Installation note:

PTFE hoses are shrink-fitted onto end pieces.

Check that hoses are free from damage.

Fig 9: Identifying PTFE Hoses Shrink-Fitted Onto End Pieces

Courtesy of BMW OF NORTH AMERICA, INC.

Installation note:

Make sure flex shaft is correctly fitted on motor
Carpet must not get between seat rails and floor panel in area of attachment points (squeaking noises)
Powerlok screws must be replaced and must not be reused
Powerlok screws are mechanical screw locks with trilobular threads
Insert all screws loose to avoid twisting
Tighten down all screws to specified torque
Tightening torque 52 10 1AZ .

NOTE:

Carry out FUNCTION CHECK WITH ADAPTER CABLE

Replacement:

INITIALIZE backrest adjustment motor.

Replacing in vehicles with production dates up to 09/2009:

Carry out VEHICLE PROGRAMMING AND ENCODING

Necessary preliminary tasks:

Raise front seat as far up as possible
Remove TRIMS ON UPPER RAILS
Procedure in event of faulty drive for forward/back seat adjustment:
ADDITIONAL WORK in event of faulty drive for forward/back seat adjustment

Removing forward/back seat adjustment motor:

Unfasten plug connection (1) and disconnect.

Fig 1: Identifying Plug Connection

Courtesy of BMW OF NORTH AMERICA, INC.

Unlock retaining tabs.

Lift drive (1) with flex shaft out of guide in direction of arrow.

Pull flex shaft on left and right out of gearbox.

Fig 2: Lifting Drive With Flex Shaft Out Of Guide

Courtesy of BMW OF NORTH AMERICA, INC.

Installing forward/back seat adjustment motor:

Insert short flex shaft (2).

Attach rubber grommet (1).

Fig 3: Inserting Short Flex Shaft

Courtesy of BMW OF NORTH AMERICA, INC.

Installation note:

Attach rubber grommet at 60° angle to connector housing.

Fig 4: Identifying Rubber Grommet Installation Angle

Courtesy of BMW OF NORTH AMERICA, INC.

Insert long flex shaft (1) with sleeve tube (2) and rubber grommet in plastic part (3).

Fig 5: Inserting Long Flex Shaft With Sleeve Tube

Courtesy of BMW OF NORTH AMERICA, INC.

Installation note:

Attach Unified Parts Group to motor at 60° angle to connector housing so that it cannot twist.

Fig 6: Identifying Motor Installation Angle

Courtesy of BMW OF NORTH AMERICA, INC.

Slide seat rail with opening forwards or back until bushing for flex shaft mounting of worm gear is flush.

Insert flex shaft.

Fig 7: Sliding Seat Rail With Flex Shaft

Courtesy of BMW OF NORTH AMERICA, INC.

Fig 8: Identifying Short Flex Shaft And Long Flex Shaft

Courtesy of BMW OF NORTH AMERICA, INC.

Slide short flex shaft (1) into longitudinal seat adjustment gearing square.

Bend long flex shaft (2) upwards and slide into longitudinal seat adjustment gearing.

Clip motor and flex shafts into carrier plate.

Installation note:

PTFE hoses are shrink-fitted onto end pieces.

Check that hoses are free from damage.

Fig 9: Identifying PTFE Hoses Shrink-Fitted Onto End Pieces

Courtesy of BMW OF NORTH AMERICA, INC.

Installation note:

Make sure flex shaft is correctly fitted on motor
Carpet must not get between seat rails and floor panel in area of attachment points (squeaking noises)
Powerlok screws must be replaced and must not be reused
Powerlok screws are mechanical screw locks with trilobular threads
Insert all screws loose to avoid twisting
Tighten down all screws to specified torque
Tightening torque 52 10 1AZ .

NOTE:

Carry out FUNCTION CHECK WITH ADAPTER CABLE

Replacement:

INITIALIZE backrest adjustment motor.

Replacing in vehicles with production dates up to 09/2009:

Carry out VEHICLE PROGRAMMING AND ENCODING