Mercedes CLS 2014 Right OS Front Seat Cushion Lumbar Support Pump A0009105102

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Genuine Mercedes-Benz CLS W218 C218 Front Right O/S Seat Lumbar Support Air Cushion – A0009105102 – 2014

Genuine Mercedes-Benz used front seat pneumatic adjustable lumbar support / air cushion bladder assembly, removed from a 2014 Mercedes-Benz CLS W218 / C218.

This component is fitted inside the front seat and forms part of the pneumatic lumbar support system, allowing the seat backrest support profile to be adjusted for improved driver/passenger comfort.

Mercedes Part Number: A0009105102

OE Number Format: A 000 910 51 02

Previous / Related Number: A2129100475 / A 212 910 04 75

Mercedes EPC Description: INSERT, ADJUSTABLE

Part Type: Pneumatic Lumbar Support / Adjustable Air Cushion / Seat Bladder

Position: Front Right Seat – donor application

UK Vehicle Side: O/S / Driver Side on RHD vehicles

Vehicle Platform: Mercedes-Benz CLS C218 / W218

Donor Vehicle: 2014 Mercedes-Benz CLS

Manufacturer: Mercedes-Benz

Condition: Used Genuine Mercedes-Benz Part

IMPORTANT PART IDENTIFICATION

Although this component is commonly advertised online as a:

Lumbar Support Pump

or:

Seat Cushion Lumbar Pump

the Mercedes-Benz EPC description for:

A0009105102

is:

INSERT, ADJUSTABLE

The component is more accurately described as the pneumatic adjustable lumbar-support cushion / air bladder assembly fitted inside the seat.

Depending on what is physically included with your item, associated pneumatic valves, hoses or pump/control components may also be present.

For the most accurate eBay description, I recommend:

Seat Lumbar Support Air Cushion / Bladder

rather than describing A0009105102 itself solely as the pump.

COMPATIBILITY

Mercedes-Benz CLS – C218 / W218

Verified applications include selected:

• CLS C218 / W218 – 2012-2018

• 2014 directly supported

• CLS 350 / CLS 350 BlueTEC depending on market

• CLS 400

• CLS 500 / CLS 550

• CLS 63 AMG

• CLS 63 AMG S

• Vehicles equipped with the corresponding adjustable pneumatic lumbar/front-seat system

Mercedes EPC data directly lists:

A 000 910 51 02 – INSERT, ADJUSTABLE

within the RIGHT SEAT parts group of the W218/C218 CLS. (PartSouq)

ADDITIONAL MERCEDES APPLICATIONS

The same A0009105102 adjustable lumbar-support component is also documented in selected:

Mercedes-Benz E-Class W212 / S212

• E200 / E220 depending on market

• E250

• E300

• E350

• E400

• E500 / E550

• E63 AMG

• Other W212/S212 variants with the corresponding seat equipment

It is also documented in selected:

Mercedes-Benz C-Class W204 / S204 / C204

applications equipped with the corresponding pneumatic lumbar-support system.

However, Mercedes used several different seat specifications, so vehicle model alone should not be used to guarantee compatibility.

The exact OE number, seat specification, pneumatic connections and physical design should be compared.

FRONT RIGHT / O/S INFORMATION

Your donor application is:

FRONT RIGHT SEAT

For a UK right-hand-drive Mercedes-Benz CLS:

Right / RH = O/S / Offside = Driver Side

Therefore your 2014 UK donor application can correctly be described as:

Front Right O/S Driver Seat Lumbar Support

However, A0009105102 itself is documented across multiple front-seat configurations, and used-part records show the same component being offered for both left- and right-front seat applications. (eBay)

For this reason, the safest fitment check remains the exact part number and physical design.

TECHNICAL INFORMATION

The Mercedes pneumatic lumbar-support system allows the shape/support of the seat backrest to be altered to suit the occupant.

The system uses inflatable support elements located within the seat structure.

Depending on seat specification, the system can include:

• Pneumatic lumbar air cushion / bladder

• Pneumatic air lines

• Control valves

• Air supply/pump system

• Electrical control components

• Seat adjustment controls

• Seat wiring

• Backrest padding

The A0009105102 adjustable insert changes shape as air pressure is applied or released.

This provides additional support to the lower-back area and allows the seat to be adjusted more closely to the occupant.

LUMBAR SUPPORT SYSTEM INFORMATION

The lumbar-support system is designed to:

• Increase lower-back support

• Improve seating comfort

• Allow adjustment of the backrest profile

• Improve occupant positioning

• Reduce discomfort during longer journeys

• Provide adjustable pneumatic support within the seat

The air bladder must remain airtight for the adjustment to remain in the selected position.

A leaking bladder or pneumatic connection can cause the lumbar support to inflate temporarily and then gradually collapse.

COMMON SYMPTOMS / REASONS FOR REPLACEMENT

Replacement may be required due to:

• Lumbar support not inflating

• Lumbar support inflates but quickly deflates

• Seat adjustment feels weak

• Lumbar adjustment completely inoperative

• Air cushion leaking

• Split or punctured air bladder

• Damaged pneumatic connection

• Cracked or damaged air hose

• Air escaping from inside the seat

• Hissing noise during adjustment

• Lumbar support will not hold its position

• Uneven backrest support

• Damage during seat dismantling

• Replacement during seat restoration

A leaking pneumatic component is a common reason for the seat support system failing to maintain pressure.

IMPORTANT DIAGNOSTIC INFORMATION

Before replacing the A0009105102 support cushion, check the complete pneumatic system.

Inspect:

• Air bladder for leaks

• Pneumatic hoses

• Hose connections

• Control valves

• Air supply/pump operation

• Electrical connectors

• Seat adjustment controls

• Seat wiring

• Pneumatic line routing

A lumbar-support fault does not automatically mean the A0009105102 bladder itself has failed.

For example, a failed air supply, leaking hose or control valve can produce similar symptoms.

AIR LEAK DIAGNOSIS

If the lumbar support:

Inflates normally but gradually loses pressure

this can indicate a leak in:

• Air bladder

• Pneumatic hose

• Hose connection

• Valve assembly

If the lumbar support:

Does not inflate at all

the fault may instead involve:

• Air supply/pump

• Electrical supply

• Seat control

• Pneumatic valve

• Disconnected hose

• Damaged wiring

Correct diagnosis before replacement is recommended.

PART NUMBER / SUPERSESSION INFORMATION

Current/reference number:

A0009105102

Mercedes format:

A 000 910 51 02

Mercedes parts data identifies this number as replacing:

A2129100475

A 212 910 04 75

Therefore buyers searching either number may find the same later replacement application. (MB Parts Giant)

Because Mercedes used different seat configurations, supersession should still be checked against the vehicle VIN and original component.

2014 MERCEDES CLS APPLICATION

For your item:

Vehicle: Mercedes-Benz CLS

Platform: C218 / W218

Year: 2014

Position: Front Right

UK Position: O/S / Driver Side

Part Type: Adjustable Pneumatic Lumbar Support Air Cushion / Bladder

Part Number: A0009105102

Mercedes EPC directly documents A0009105102 within the W218/C218 front-seat system. (PartSouq)

A separate used-parts record also documents this exact number on a 2014 CLS C218, providing additional direct evidence for the model-year application. (BreakerYard)

SEAT SPECIFICATION INFORMATION

Mercedes-Benz offered several different front-seat configurations in the CLS W218.

Depending on vehicle specification these can include:

• Standard electrically adjustable seats

• Memory seats

• Heated seats

• Ventilated seats

• Multicontour seats

• Dynamic/multicontour seat functions

• AMG seat specifications

The pneumatic components can vary according to equipment.

Therefore the buyer should not rely solely on:

CLS + 2014

when selecting the replacement.

Matching:

A0009105102

with the original component provides a much stronger compatibility check.

INSTALLATION

Installation requires removal or partial dismantling of the seat upholstery/backrest depending on vehicle specification.

During installation:

• Disconnect the battery where required by Mercedes workshop procedure

• Confirm A0009105102 matches the original component

• Compare pneumatic connections

• Compare cushion/bladder shape

• Check all hoses

• Inspect connectors

• Install the support correctly within the seat

• Avoid folding or puncturing the air bladder

• Route pneumatic hoses correctly

• Reconnect all air lines securely

• Reassemble the seat upholstery correctly

• Test lumbar adjustment

• Confirm the system inflates correctly

• Confirm it maintains pressure

Care should be taken around the seat’s SRS/side-airbag wiring and components during dismantling.

PROGRAMMING / CODING

Lumbar Air Cushion / Bladder: No programming normally required

A like-for-like A0009105102 pneumatic support insert does not normally require coding simply because the bladder has been replaced.

However, if electrical seat modules, pneumatic control modules or other electronic components are changed at the same time, diagnostic configuration may be required depending on the vehicle.

Any SRS warning generated during seat work should be correctly diagnosed using Mercedes-compatible equipment.

IMPORTANT COMPATIBILITY NOTE

Before ordering, please compare:

A0009105102

A 000 910 51 02

and where applicable:

A2129100475

A 212 910 04 75

Also check:

• Mercedes CLS W218/C218

• Vehicle production year

• Original component number

• Front-seat specification

• Pneumatic bladder shape

• Air hose connections

• Number and position of pneumatic connections

• Seat equipment/options

• Multicontour specification where applicable

• Electrical/pneumatic equipment included

• Listing photographs

Do not rely solely on “Mercedes CLS lumbar pump” when ordering.

Mercedes EPC describes A0009105102 as the adjustable insert, and the component is used across several Mercedes front-seat configurations.

For the safest replacement, match A0009105102 directly with the original component.

CONDITION

Used Genuine Mercedes-Benz Seat Lumbar Support Component.

Normal signs of previous installation may be present.

Please inspect all listing photographs carefully for the exact A0009105102 number, pneumatic connections, air cushion/bladder, hoses if included and overall condition.

As this is a pneumatic component, all connections should be checked carefully during installation and the system tested to ensure it holds pressure correctly.

Ideal genuine Mercedes-Benz replacement adjustable pneumatic front-seat lumbar support air cushion / bladder assembly for a compatible 2014 CLS W218/C218 using A0009105102.