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

WARNING: This page is about a different car, the 2003 BMW 525i, 2002 BMW 525i, and 2001 BMW 525i. However, it is still accessible from the selected car via links, so may be relevant.

Remove backrest cover with padding. See 52 13 041 REMOVING AND INSTALLING / REPLACING INNER COVER ON LEFT OR RIGHT FRONT SEAT BACKREST (NORMAL/ MANUAL)

Unlock plug (1) and remove.

Fig 1: Unlocking Plug

Courtesy of BMW OF NORTH AMERICA, INC.

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

Fig 2: Removing Backrest Adjustment Shaft From Backrest Adjustment Gearing

Courtesy of BMW OF NORTH AMERICA, INC.

Remove retainers.

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

Fig 3: Removing Drive Unit For Head Restraint Adjustment

Courtesy of BMW OF NORTH AMERICA, INC.

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: Installing Output Spindle

Courtesy of BMW OF NORTH AMERICA, INC.

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

Courtesy of BMW OF NORTH AMERICA, INC.

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 Into Backrest Adjustment Gearing

Courtesy of BMW OF NORTH AMERICA, INC.

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: Measuring Distance X

Courtesy of BMW OF NORTH AMERICA, INC.

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

Courtesy of BMW OF NORTH AMERICA, INC.