BMW 7 Series: Removing And Installing/Replacing Forward/Back Seat Adjustment Drive Unit

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:

Removing forward/back seat adjustment motor

Unfasten plug connection (1) and disconnect.

Fig. 42: Identifying Forward/Back Seat Adjustment Motor Plug Connection

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 gearing.

Fig. 43: Pulling Flex Shaft From Gearing

Installing forward/back seat adjustment motor

Insert short flex shaft (1).

Attach rubber grommet.

Fig. 44: Inserting Short Flex Shaft

Installation

Attach rubber grommet at 60º angle to connector housing.

Fig. 45: Connecting Rubber Grommet At 60º Angle To Connector Housing

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

Fig. 46: Identifying Long Flex Shaft With Sleeve Tube And Rubber Grommet In Plastic Part

Installation

Attach assembly to motor at 60º angle to connector housing so that it cannot twist.

Fig. 47: Connecting Assembly To Motor At 60º Angle To Connector Housing

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

Insert flex shaft.

Fig. 48: Sliding Seat Rail Forward/Backward

Fig. 49: Identifying Short Flex Shaft And Long Flex Shaft

Slide short flex shaft (1) into forward/back 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

PTFE hoses are shrink-fitted onto end pieces.

Check that hoses are free from damage.

Fig. 50: Identifying PTFE Hoses

Installation

• 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

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