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Mercedes W205 Window Switch Button Peeling/Sticky Repair Guide — here is the practical version. The C-Class W205 has a known interior problem: the window switch buttons peel and turn sticky because the rubber coating on them degrades. This guide covers the cause, your two repair options, the removal steps, and the fault codes that sometimes come with the problem.

You have two fixes. Replace the entire switch module, or replace the individual button caps. Caps are cheaper and easier, and they solve the issue when only the coating has failed. Go with the module when the switch electronics are also at fault.

Why the W205 switch buttons fail

The buttons on the W205 window switch panel carry a rubberized coating. Over time that coating degrades. The surface starts to peel, and it leaves a sticky film on your fingers every time you touch it.

The sticky residue itself you can treat directly: clean it off with isopropyl alcohol. That works whether you are refitting the original buttons or pressing on fresh caps.

Two ways to repair it

• Replace the button caps. Cheaper and easier. The caps snap onto the existing switches, so no wiring work is involved.
• Replace the entire switch module. The fuller fix. Pick this route when buttons are dead or the module throws LIN bus fault codes.

If you choose the module route, the Master Power Window Control Switch A2059051513 fits the Mercedes-Benz C-Class W205. KOEEP also lists the 2059057011 master switch twice — this listing and an alternative listing — so compare photos, price, and stock between the two before you order.

Button cap replacement, step by step

1. Pry the switch panel out gently with trim tools. Work slowly so the surrounding trim stays unmarked.
2. Pop the old buttons off the panel. They snap on, so they release with firm, even pressure.
3. Clean any sticky residue off the switches and panel with isopropyl alcohol, then let it dry.
4. Press the new button caps into place. They snap on exactly like the originals.

That is the whole job. Nothing wiring-related comes apart — you are only swapping snap-on caps. That is why cap replacement is the cheaper and easier path when the coating is the only failure.

Full module replacement

When the problem goes beyond cosmetics — dead buttons, stored fault codes — replace the whole switch module. Disconnect power first, unplug the module connector, swap the unit, and reseat the new connector firmly. Test every button before you clip the trim back in.

What to verify before ordering

Start with the vehicle year, make, model, engine or drivetrain, and the original equipment number printed on the removed part. A similar-looking component can still be incompatible, so match connector shape, mounting points, and dimensions, check the left/right position, and read the seller's fitment notes against your original part.

• Record the VIN and exact trim level.
• Compare the OE or interchange number and connector layout.
• Check whether the part is front/rear, left/right, or a complete set.
• Inspect nearby components that could cause the same symptom.

Repair and fault codes at a glance

The table below sums up the whole job in one place.

Installation and diagnostic checklist

Disconnect power when the procedure requires it, support the vehicle correctly, and follow the workshop manual for torque values and calibration steps. Do not guess either of those.

• Clean mating surfaces before reassembly.
• Route wiring away from heat and moving parts.
• Test the repair before the vehicle goes back into service.

If a warning light stays on, scan the relevant diagnostic codes and verify the repair instead of replacing additional parts at random.

DTC P1800 and B1000 explained

Both codes indicate a LIN bus communication error with the window control module. The fix is often simple: unplug and reseat the connectors so the contact is solid.

If reseating does not clear the code, replacing the switch module is the usual next step — and that is where the A2059051513 master switch for the W205 comes in.

How to choose the right replacement

Prioritize verified compatibility, material quality, warranty coverage, and clear product photos. If a photo hides the connector or the button face, ask for more pictures before you pay.

For safety-critical systems — brakes, steering, sensors, and fuel delivery — always use the vehicle-specific specification rather than a universal substitute.

Beyond switches, the KOEEP auto and motorcycle parts collection covers components across makes and systems, so you can add anything else you need to the same order instead of paying shipping twice.

Related KOEEP guides

• Peeling switch buttons are not a W205-only problem. The button cover guide for the C-Class W204 and E-Class W212 covers the same failure on the previous generations.
• If you also service American vehicles, the power window master control switch guide for the Ford F-150, Expedition, Mercury and Lincoln covers DTC and CAN-bus compliance on those platforms.
• Once the buttons are fixed, finish the cabin with the 2017-2019 Mercedes GLS550 OEM interior floor mat set in Brown Designo.

Frequently asked questions