When replacing the backrest frame: Remount components

WARNING: This page is about a different car, the 2025 BMW M4, 2024 BMW M4, 2023 BMW M4, 2022 BMW M4, and 2021 BMW M4. However, it is still accessible from the selected car via links, so may be relevant.

Removing the drive motor for the headrest height adjuster

Unlock plug connection (1) and disconnect.

Courtesy of BMW OF NORTH AMERICA, INC.

Remove the drive motor for the headrest height adjuster (1) at the attachment points (2) in the direction of the arrow.

Courtesy of BMW OF NORTH AMERICA, INC.

Removing the head restraint guide

Unlock the locks (1) and remove the head restraint guides (2) in the direction of the arrow.

Courtesy of BMW OF NORTH AMERICA, INC.

Remove lumbar support on front seat

Precondition

The lumbar support and backrest adjustment are completely pressure-free.

NOTE: Perform the steps on the right and left side.

Release the screws (1) and guide out the air cushion of the left/right backrest adjustment.

Courtesy of BMW OF NORTH AMERICA, INC.

Disconnect the plug connections (2) and unclip the existing cable clip.
Unclip the lumbar support (1) at the clips (3) and guide out the retaining tabs.

Courtesy of BMW OF NORTH AMERICA, INC.

Carefully guide out the lumbar support (1) to the side, complete with the pump unit and valve manifold.

Courtesy of BMW OF NORTH AMERICA, INC.

Removing the release mechanism on the front seat

Release latch mechanisms (arrows) and remove cover cap (1).

Courtesy of BMW OF NORTH AMERICA, INC.

Drill out blind rivets (1) on the front and rear side of the backrest frame.
Guide out release mechanism on the front seat (2).
Guide out cable for release mechanism on the front seat (3) and remove release mechanism on the front seat (2).

Courtesy of BMW OF NORTH AMERICA, INC.

Installing the release mechanism on the front seat

Position the release mechanism on the front seat (2) and feed in the cable linkage for the release mechanism on the front seat (3).
Position the release mechanism at the front seat (2) correctly.
Replace blind rivets (1).
Parts: Blind rivet

Fasten the release mechanism at the front seat (2) using the blind rivets (1) on the front and rear sides of the backrest frame.

Press the cover cap (1) until the locks (arrows) are engaged.

Courtesy of BMW OF NORTH AMERICA, INC.

Courtesy of BMW OF NORTH AMERICA, INC.

Install lumbar support on front seat

Precondition

Lumbar support and backrest width adjustment completely depressurized.

Carefully insert the lumbar support (1) complete with pump unit and valve block as shown.

Courtesy of BMW OF NORTH AMERICA, INC.

Position the lumbar support (1) at the clips (3) and clip in.
Connect plug connections (2) and clip in existing cable clips.

Courtesy of BMW OF NORTH AMERICA, INC.

NOTE: Perform the steps on the right and left side.

Position the air cushion of the backrest width adjustment (2) on the left and right and tighten screws (1).

Courtesy of BMW OF NORTH AMERICA, INC.

Installing the headrest guide

Correctly position the headrest guides (2) and install in the direction of the arrow.

The head restraint guides (2) are marked at the top against incorrect assembly with an arrow in the direction of travel.

The detents (1) must engage audibly.

Courtesy of BMW OF NORTH AMERICA, INC.

Installing the drive for head restraint height adjustment

NOTE: TECHNICAL INFORMATION
The drivetrain for the headrest height adjustment must be replaced as soon as the head restraint is removed.

Replace the drive for the head restraint height adjustment (1).
Parts: Drive for headrest height adjustment

Install the drive for head restraint height adjustment (1) at the attachment points (2) in the arrow direction.

Courtesy of BMW OF NORTH AMERICA, INC.

Connect connectors (1) and lock.

Courtesy of BMW OF NORTH AMERICA, INC.