52 14 899 Additional Work (Normal/ Electric) With Defective Drive For Longitudinal Adjustment

WARNING: This page is about a different variant/trim than selected.

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 Of Longitudinal Seat Adjustment

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

Fig 2: Removing Servodrive

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Activate the operating switch for the seat position adjustment:

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
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 & Internal Gear
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Using a pneumatic saw (1), cut through drive shaft (2) from rear.

Fig 4: Cutting Through Drive Shaft

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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: Removing Gear

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

Fig 7: Removing Front Seat

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

Replace seat mechanism on front seat.