Safety Warning

DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.

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HOMESERVICE MANUALSBMW2009528I STANDARDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 3473 (SEATS - REPAIR)FRONT SEAT, COMFORT52 17 050 REPLACE LUMBAR SUPPORT ON FRONT SEAT (COMFORT WITHOUT OE ACTIVE SEAT) LEFT OR RIGHT

2009 BMW 528i Standard

52 17 050 Replace lumbar support on front seat (comfort without OE active seat) left or right

2009 BMW 528i StandardSECTION 52 17 050 Replace lumbar support on front seat (comfort without OE active seat) left or right

WARNING: This page does not describe the selected car, but rather 50 other vehicles, including the 2016 BMW M5, 2016 BMW ActiveHybrid 5, 2016 BMW 550i xDrive, 2016 BMW 550i, and 2016 BMW 535i xDrive. However, it is still accessible from the selected car via links, so may be relevant.

Necessary preliminary tasks:

Remove both rear panels . See 52 17 205 REMOVING AND INSTALLING/REPLACING BOTH REAR PANELS ON LEFT OR RIGHT FRONT SEAT BACKREST or 52 17 205 REMOVING AND INSTALLING/REPLACING BOTH REAR PANELS ON LEFT OR RIGHT FRONT SEAT BACKREST (COMFORT) on front seat backrest

Detach backrest cover (1) in the marked area.

Fig 1: Identifying Backrest Cover In Marked Area

G09927287

Courtesy of BMW OF NORTH AMERICA, INC.

Detach welt from backrest cover (1).

Fig 2: Detaching Welt From Backrest Cover

G09927433

Courtesy of BMW OF NORTH AMERICA, INC.

Press latch mechanism and slide valve body (1) in direction of arrow.

Installation note:

Ensure correct fit of valve body (1) in backrest frame.

Fig 3: Fitting Valve Body In Backrest Frame

G09927434

Courtesy of BMW OF NORTH AMERICA, INC.

Unlock plug connections (1) and disconnect.

Release clamps (2).

Disengage drive unit (3) and valve body (4).

Fig 4: Identifying Drive Unit, Valve Body, Clamps And Plug Connections

G09927435

Courtesy of BMW OF NORTH AMERICA, INC.

Detach tabs (1) of lumbar support (2).

Carefully feed out lumbar support (2) in downward direction between spring wire and backrest padding.

Remove lumbar support (2) complete with drive unit and valve body.

Installation note:

Check lumbar support (2) for damage.

Ensure correct fit of tabs (1) on marked spring wires.

Air hoses must not be kinked.

Fig 5: Locating Tabs On Marked Spring Wires

G09927436

Courtesy of BMW OF NORTH AMERICA, INC.

RENDER: 1.0x

NO RELATED

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.
• Brakes feel soft, pull hard to one side, or make grinding noises.
• The engine overheats, stalls repeatedly, or misfires under load.
• You are missing required tools, torque specs, or safe lifting equipment.
• You are not confident in the next step or safety outcome.