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

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2016 BMW 328i xDrive, 2016 BMW 328d xDrive, 2015 BMW 328i xDrive, 2015 BMW 328d xDrive, and 2014 BMW 328i xDrive. However, it is still accessible from the selected car via links, so may be relevant.

Necessary preliminary work:

Raise front seat as far up as possible

Removal of electric motor for forward/back seat adjustment:

Unfasten plug connection (1) and disconnect.

Fig 1: Plug Connection And Electric Motor

Courtesy of BMW OF NORTH AMERICA, INC.

Lift long flex shaft (3) out of guide in direction of arrow.

Pull out flex shaft (3) from electric motor for forward/back seat adjustment (1).

Remove electric motor for forward/back seat adjustment (1) in direction of arrow from holder (2).

Fig 2: Removing Electric Motor For Forward/Back Seat Adjustment From Holder

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Installation of electric motor for forward/back seat adjustment:

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

Insert short flex shaft.

Fig 3: Sliding Seat Rail

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Connect electric motor for forward/back seat adjustment (2) to short flex shaft (1).

Installation note:

Make sure flex shaft (1) is correctly seated in electric motor (2) and seat rail mounting.

Clip in electric motor for forward/back seat adjustment (2) into holder (3).

Installation note:

Electric motor for forward/back seat adjustment (2) must audibly engage in holder (3).

Fig 4: Connecting Electric Motor For Forward/Back Seat Adjustment To Short Flex Shaft

Courtesy of BMW OF NORTH AMERICA, INC.

Fig 5: Forward/Back Seat Adjustment And Long Flex Shaft

Courtesy of BMW OF NORTH AMERICA, INC.

Insert long flex shaft (2) in worm gear on seat rail.

Bend long flex shaft (2) upwards and slide into electric motor for forward/back seat adjustment (1).

Clip in flex shaft into carrier plate.

Installation note:

Make sure flex shaft (2) is correctly seated in electric motor (1) and seat rail mounting.

Installation note:

PTFE hoses are shrink-fitted onto end pieces.

Check that hoses are free from damage.

Fig 6: PTFE Hoses

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NOTE: Carry out a function check.

Replacement:

INITIALIZE drive unit for forward/back seat adjustment.