67 31 500 Removing and installing/replacing forward/back seat adjustment drive unit

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Necessary preliminary tasks:

Remove driver's or front passenger seat. See REMOVING DRIVER'S SEAT or REMOVING FRONT PASSENGER SEAT .

Type F33:

Unfasten plug connection (1) and disconnect.

Release clamp (2).

Release screws (3).

Tightening torque 72 11 01AZ .

Feed out inertia reel (4) upwards to the front from the seat mechanism.

Fig 1: Removing Inertia Reel

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Type F33:

Installation note:

Attach inertia reel (1) properly in guide (2).

Fig 2: Identifying Inertia Reel And Guide

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Pull the metal clamp (1) off the seat mechanism.

Release screw (2).

Tightening torque 72 11 01AZ .

Remove inertia reel unit.

Installation note:

Inertia reel is coded to prevent incorrect installation.

Make sure metal clamp is securely seated.

Fig 3: Identifying Metal Clamp And Screw

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Release screws (1).

Tightening torque 52 10 6AZ .

Fold upper seat section (2) backwards in direction of arrow.

Fig 4: Folding Upper Seat Section Backwards

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Unfasten plug connection (1) and disconnect.

Undo rivet connections (2).

Completely remove rivet residue.

Fig 5: Identifying Rivet Connections And Plug Connection

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Lift drive (1) with flex shaft out of guide in direction of arrow.

Pull flex shaft on left and right out of gearbox.

Fig 6: Pulling Flex Shaft Out Of Gearbox

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Installation note:

Slide seat rail with opening forwards or backwards until bushing for flex shaft mounting (4) of worm gear is flush.

Slide in short flex shaft (1).

Insert drive (2) and slide in flex shaft (1) into square on drive (2).

Bend long flex shaft (3) upwards and insert into bushing for flex shaft mounting (4) of worm gear.

Fig 7: Sliding Flex Shaft Into Square On Drive

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Installation note:

PTFE hoses (1) are shrink-fitted onto end pieces.

Check hoses (1) for damage.

Fig 8: Identifying PTFE Hoses

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Installation note:

Ensure flex shaft in drive and worm gear is properly installed
Carry out FUNCTION CHECK WITH ADAPTER CABLE

Replacement:

INITIALIZE backrest adjustment motor.