67 31 541 Removing and installing/replacing drive unit for head restraint adjustment (comfort seat, backrest completely removed)

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Remove backrest cover with padding. See 52 17 405 REPLACING BACK-REST COVER FOR FRONT SEAT .

Unlock plug (1) and remove.

Fig 1: Removing Plug

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Pull backrest adjustment shaft (1) out of backrest adjustment gearing (2) and drive unit for head restraint adjustment (3).

Fig 2: Pulling Backrest Adjustment Shaft Out Of Backrest Adjustment Gearing

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Remove retainers.

Remove backrest adjustment gearing (1) and drive unit for head restraint adjustment (2).

Fig 3: Removing Backrest Adjustment Gearing

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Screw in output spindle (1) up to stop (2) and then screw back 1 turn.

Push backrest adjustment gearing (3) onto backrest frame.

If necessary, press backrest frame down a little.

Fit retainers.

Fig 4: Pushing Backrest Adjustment Gearing Onto Backrest Frame

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Turn output spindle (1) until backrest adjustment gearing (2) can be pushed on without tension (do not press backrest frame down under any circumstances).

If necessary, readjust with backrest adjustment shaft.

Fit retainers.

Fig 5: Turning Output Spindle

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Insert backrest adjustment shaft (1) into backrest adjustment gearing (2) (other end with square section (3) is not fitted yet).

Fig 6: Inserting Backrest Adjustment Shaft

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Place backrest frame on a flat surface. Measure distance (X) on left and right.

Permitted deviation on left and right sides: max. 2 mm.

If necessary, adjust backrest adjustment gearing with square section of backrest adjustment shaft.

Fig 7: Identifying Backrest Frame On Flat Surface

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Insert backrest adjustment shaft (1) into drive unit for head restraint adjustment (3).

Installation:

Backrest adjustment shaft must not protrude over sheet metal fold (risk of damage).

If necessary, turn backrest adjustment shaft (1) minimally by hand until square section fits into drive unit for head restraint adjustment (3).

Fig 8: Inserting Backrest Adjustment Shaft Into Drive Unit For Head Restraint Adjustment

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