52 13 405 Replacing back-rest cover for left or right front seat (normal / manual)

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Remove rear panel on front seat backrest, refer to REMOVING AND INSTALLING / REPLACING REAR PANEL ON LEFT OR RIGHT FRONT SEAT BACKREST (NORMAL/MANUAL) .

Detach backrest cover (1) from backrest frame (2).

Fig 1: Detaching Backrest Cover From Backrest Frame

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Version with seat heating only: expose seat heating cable:

Remove outer cover on front seat:

Manual operation, refer to REMOVING AND INSTALLING / REPLACING OUTER COVER ON LEFT OR RIGHT FRONT SEAT BACK-REST (NORMAL / MANUAL) .

Electrical operation, refer to REMOVING AND INSTALLING/REPLACING OUTER COVER ON FRONT LEFT OR RIGHT SEAT (SPORTS/ELECTRIC) .

Unfasten plug connection (1).

Pull cable (2) out of holder (3).

Fig 2: Pulling Cable Out Of Holder (Version With Seat Heating Only)

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Model with seat heating only:

Pull out tongue (1).

Pull cable (2) out of holder (3).

Fig 3: Pulling Cable Out Of Holder (Model With Seat Heating Only)

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Model with seat heating only:

Lift out Omega clip (1).

Pull out cable (2) from Omega clip (1).

Model with lumbar supports:

If necessary, disconnect plug connections (3) and (4).

Lift out Omega clip (1).

Fig 4: Pulling Out Cable From Omega Clip (Model With Seat Heating Only)

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Removal/replacement of backrest frame only:

Detach cover (1) on left/right.

CAUTION: Do not under any circumstances turn screw underneath screw (2), this would destroy the seat frame.

Loosen left/right screw (2).

Detach backrest frame (3) with backrest cover upwards.

Installation:

Replace screws (microencapsulated).
Tightening Torque, refer to SEATS - TIGHTENING TORQUES - 3-SERIES .

Fig 5: Removal/Replacement Of Backrest Frame Only

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Removal of backrest cover with padding/replacement of backrest frame only:

Remove both guides for front head restraint, refer to 52 13 405 Replacing back-rest cover for left or right front seat (normal / manual)

Version with lumbar support only:

NOTE: If necessary, gently heat air hose when firmly seated.
Valve housing must not be unclipped, leakage.
If the valve housing is unclipped, release screw and clip valve housing together.

Disconnect hoses (2) and (3) from valve housing (1).

2 Hose (blue), top cushion

3 Hose (red), bottom cushion

Fig 6: Disconnecting Hoses From Valve Housing

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NOTE: For purposes of clarity, shown here without valve housing.

Installation:

Observe cable guide (1) for backrest heating.
Lay air hoses (2) without kinks through hole (3).

Fig 7: Laying Air Hoses Without Kinks Through Hole
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