52 14 ... Additional Work (Normal/Electric) With Defective Drive/Gear For Longitudinal Adjustment

WARNING: This page is about a different car, the 2008 BMW Alpina and 2007 BMW Alpina. 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. See SEATS - TIGHTENING TORQUES - ALPINA .

Fig 1: Identifying Screws

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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

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Release screws (1).

Remove drive (4).

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

Fig 3: Identifying Flex Shaft With Holder

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Activate the operating switch for the seat position adjustment:

No function:
- Disconnect plug connection on drive.
- Connect new drive and check function.
- Gear is OK. 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: Identifying Worm Gear And Screws

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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. See 52 14 000 REMOVING AND INSTALLING LEFT OR RIGHT FRONT SEAT (NORMAL/ELECTRIC) .

Replace both seat rails . See 52 14 010 REMOVING AND INSTALLING/REPLACING BOTH SEAT RAILS ON LEFT OR RIGHT FRONT SEAT (NORMAL/ELECTRIC) .

Fig 5: Identifying Upper Rail Screws

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