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

WARNING: This page is about a different car, the 2005 BMW 545i and 2004 BMW 545i. However, it is still accessible from the selected car via links, so may be relevant.

Necessary Preliminary Tasks:

Remove front seat. Refer to 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.

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

Fig 1: Identifying Backrest Cover Lugs

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NOTE: For purposes of clarity, illustration shows backrest cover removed.

Release screw connections (1) on AKS carrier.

Fig 2: Locating 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: Aligning AKS Carrier

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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

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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: Identifying Measurement A For Spindle

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Replacement:

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