52 14... Additional work (normal/electric) with defective drive/gear for longitudinal adjustment

WARNING: This page is about a different car, the 2010 BMW 535xi, 2009 BMW 535xi, and 2008 BMW 535xi. However, it is still accessible from the selected car via links, so may be relevant.

CAUTION: Seat rails must be replaced by detaching worm gear.

Move seat height and seat tilt adjustment to top position.

To obtain improved access if necessary:

Release screws (1).
Tip seat towards rear.

Installation:

Tightening torque, 52 10 6AZ .

Fig 1: Identifying Bolts

Courtesy of BMW OF NORTH AMERICA, INC.

Lift drive (1) and flex shaft (3) out of guide (2) in direction of arrow.

Detach flex shaft (3) (plug connection).

Fig 2: Lifting Drive And Flex Shaft Out Of Guide

Courtesy of BMW OF NORTH AMERICA, INC.

Release screws (1).

Remove drive (4).

Detach flex shaft (3) with holder (2).

Fig 3: Identifying Screws And Flex Shaft With Holder

Courtesy of BMW OF NORTH AMERICA, INC.

Activate the operating switch for the seat position adjustment:

No function:
- Disconnect plug connection on drive.
- Connect new drive and check function.
- Gear is O.K. if drive runs.
Assemble seat.
Drive running:
- Gear for longitudinal seat adjustment defective.

Removing gear for longitudinal seat adjustment:

Release screws (1).

Remove worm gear (2) on left and right with cover.

Fig 4: Removing Worm Gear On Left And Right With Cover

Courtesy of BMW OF NORTH AMERICA, INC.

Release screws (1) on upper rail on left and right.

NOTE: The seat can now be adjusted together with the upper rail.

REMOVE FRONT SEAT .

Replace BOTH SEAT RAILS .

Fig 5: Identifying Screws On Upper Rail On Left And Right

Courtesy of BMW OF NORTH AMERICA, INC.