67 31 540 Removing and Installing/Replacing Drive Unit For Head Restraint Adjustment (Comfort Seat)

Necessary preliminary tasks: 

• Remove front seat.  See 52 17 000 REMOVING AND INSTALLING LEFT OR RIGHT FRONT SEAT (COMFORT) .
• Remove both rear panels on front seat backrest.  See 52 17 205 REMOVING AND INSTALLING/REPLACING BOTH REAR PANELS ON LEFT OR RIGHT FRONT SEAT BACKREST (COMFORT) .

Pull backrest cover (1) in direction of arrow over metal lugs (2) and detach.

If necessary, detach backrest cover (1) on both sides from backrest frame.

Fig 1: Detaching Backrest Cover On Sides From Backrest Frame

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Release screw connections (1) on AKS carrier.

Fig 2: Identifying Screw Connections On AKS Carrier

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Move AKS carrier (1) in direction of arrow.

Unhook backrest cover (2) on backrest frame (3).

Fig 3: Unhooking Backrest Cover On Backrest Frame

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Pull drive shaft (1) in direction of arrow out of drive shaft receptacle (2).

Installation: 

Make sure drive shaft (1) is correctly seated in receptacle (2).

Disconnect plug connection (3).

Remove circlip (4).

Feed out drive unit for backrest head adjustment (5) and remove.

Fig 4: Removing Drive Shaft From Drive Shaft Receptacle

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Removal and installation only: 

Do not turn spindle (1) in order not to change measurement A.

Replacement only: 

Adopt measurement A of removed drive unit for backrest head adjustment (2). If necessary, adjust measurement A by turning spindle (1).

Fig 5: Turning Spindle For Measurement Adjustment

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Replacement: 

Initialize  drive unit for backrest head adjustment. See 67 31 ... NOTES ON INITIALIZING ELECTRIC SEAT SERVODRIVES