Restore Comfort and Functionality: Mercedes-Benz Seat Control Unit A2218704987 / 00404684 for W221 S-Class
Detailed Blog Post: Mercedes Seat Control Unit A2218704987 / 00404684.
Product Overview:
The Mercedes-Benz Seat Control Unit A2218704987 / 00404684 is an essential electronic module that controls key seat functions like:
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Electric seat adjustments (height, backrest angle, seat position)
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Seat memory settings
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Lumbar support (on some models)
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Optional seat heating/ventilation (where equipped)
This genuine OEM part ensures seamless communication with your vehicle's CAN-bus network, providing precise control over your seat's comfort features.
Compatibility List:
| Vehicle | Model | Chassis | Year Range |
|---|---|---|---|
| Mercedes-Benz | S-Class | W221 | 2006 - 2013 |
| Mercedes-Benz | CL-Class | C216 | 2006 - 2014 |
Popular Fitments Include:
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S350, S500, S550, S600, S63 AMG, S65 AMG
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CL500, CL550, CL600, CL63 AMG, CL65 AMG
OEM Part Numbers (Interchangeable):
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A2218704987
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00404684
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2218704987
Tip: Always cross-check your old unit’s part number before purchase.
Common Symptoms of a Faulty Seat Control Unit:
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Seat doesn’t adjust electrically
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Memory function not working
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Intermittent seat control issues
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Error codes related to seat electronics
How to Replace the Seat Control Unit:
Tools Needed:
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Trim removal tools
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Screwdrivers (Phillips and flathead)
Steps:
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Disconnect the battery to prevent electrical shorts.
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Access the seat module location: Typically found under the driver or passenger seat.
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Unplug the electrical connectors from the old unit.
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Install the new control unit, ensuring all plugs are secure.
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Reconnect the battery.
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Test all seat functions before fully reassembling the trim.
Note: Some models may require coding or programming using Mercedes STAR Diagnostic tools.
Why Buy OEM?
Genuine Mercedes-Benz modules guarantee long-term reliability, perfect fitment, and compatibility with your vehicle’s onboard systems.
