67 31 540 Removing and installing/replacing drive unit for head restraint adjustment (comfort seat)
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Necessary preliminary tasks:
- Remove both rear panels on front seat backrest , see 52 14 198 REMOVING AND INSTALLING OR REPLACING REAR PANEL ON LEFT OR RIGHT FRONT SEAT BACKREST .
Disconnect plug connection (1).
Release screw (2).
Tightening torque 67 31 4AZ , see 67 31 DRIVE, SEAT ADJUSTMENT .
Pull shaft (1) in direction of arrow out of shaft receptacle (2).
Installation:
Make sure shaft (1) is correctly seated in receptacle (2).
Release retaining ring (3).
Feed out drive unit for backrest head adjustment (4) and remove.
Removal and installation only:
Do not turn spindle (1) in order not to change measurement A.
Replacement:
Adopt measurement A of removed drive unit for backrest head adjustment (2). If necessary, adjust measurement A by turning spindle (1).
Initialize drive unit for backrest head adjustment, see 67 31... Notes on initializing electric seat servodrives .