52 14 899 Additional work (normal/electric) with defective drive for longitudinal adjustment

WARNING: This page is about a different car, the 2003 BMW X5, 2002 BMW X5, and 2001 BMW X5. However, it is still accessible from the selected car via links, so may be relevant.

Set seat tilt adjustment to max. up setting.

Release screw (1) on actuator drive (2) of longitudinal seat adjustment.

Fig 1: Releasing Screw On Actuator Drive

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Release screw (1) on servodrive (2) of longitudinal seat adjustment and remove servodrive (2).

Fig 2: Removing Screw On Servodrive

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Activate the operating switch for the seat position adjustment:

(A) No function:

Disconnect plug for longitudinal seat adjustment.
Connect new servodrive and check function.
If servodrive is running, gear is O.K.
Reassemble front seat.

(B) Actuator drive running:

Transmission for longitudinal seat adjustment defective!
Continue with "Disassembly of faulty gear for longitudinal seat adjustment".

Disassembly Of Faulty Gear (1) For Longitudinal Seat Adjustment:

NOTE: For purposes of clarity, the backrest frame and seat cover are shown removed.

(2) Input shaft

(3) Internal gear

Fig 3: Locating Input Shaft And Internal Gear

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Using a pneumatic saw (1),

cut through drive shaft (2) from rear.

Fig 4: Cutting Drive Shaft Using Pneumatic Saw

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Remove drive shaft (1) from gear (2).

Fig 5: Removing Drive Shaft From Gear

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Release screw (1) and remove gear (2).

Fig 6: Releasing Retaining Screw For Gear

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Over rest of drive shaft (1), adjust front seat, release screws on floor panel and remove front seat.

NOTE: If gear (4) is faulty, detach cover (2), release screws (3), and remove gear (4).

Fig 7: Identifying Drive Shaft, Cover And Gear

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Replace seat mechanism on front seat.