67 31 540 Removing and installing/replacing drive unit for head restraint adjustment (comfort seat)

Necessary preliminary tasks: 

• Remove front seat. Refer to 52 14 000 REMOVING AND INSTALLING LEFT OR RIGHT FRONT SEAT (NORMAL/ELECTRIC) or 52 17 000 REMOVING AND INSTALLING LEFT OR RIGHT FRONT SEAT (COMFORT) .
• Remove both rear panels on front seat backrest. Refer to 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.

Fig 1: Detaching Backrest Cover

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

Release screw connections (1) on AKS carrier.

Fig 2: Releasing Screw Connections On AKS Carrier

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Move AKS carrier (1) in direction of arrow.

Fig 3: Unhooking Backrest Cover On Backrest Frame

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

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

Fig 4: Removing Drive Unit For Backrest Head Adjustment

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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.

Removal and installation only:

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

Fig 5: Identifying Spindle

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Replacement only:

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

Replacement: 

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