Mercedes nyckel w203

Key will not turn. SOLVED

Key will not turn. SOLVED

Just thought I would post to explain about a somewhat common issue people are getting on their Ws and how it was resolved for me. This may not be the same problem you have, so I will explain in detail.

I had the issue of the key not being recognized/not unlocking the steering or any reaction whatsoever when I would put it in, but only after the battery had died (drained overnight)

I am a service technician (mechanic if you prefer), and somewhat familiar with MB systems.

This has happened before, once when the battery had died, so I checked and noticed the battery was drained (known seat module drain, repaired but has reoccured about 1 year later, usually left unplugged but we had forgotten to unplug it this time).

Tried a regular boost. Didn't help (unlike the time before)
Tried fully recharging with a trickle charger and tested with sophisticated battery testing equipment, battery fails test.

Replace battery. Does not improve situation BUT now battery is KNOWN good.

Checking fuses. All ok in all fuse boxes.
Key will unlock doors etc, but not recognized when inserted in the ignition switch (ak

Byte av energikälla i nyckelkontrollen till enstaka Mercedes C-klass.

Modell: Mercedes C KlassW - tid
Del: Nyckel

Byter vi batteriet på ett nyckel mot en Mercedes C-klass? Låt oss titta hur oss gör det: vi tar vår fjärrkontroll och ändrar bostadsort knappen till att erhålla ut metallnyckeln. När nyckeln har tagits ut: använder vi enstaka spak till att ta ut batterihållaren från locket (som inom videon). oss tar ut batteriet ifrån hållaren (använd en små skruvmejsel), tar sedan en nytt energikälla av identisk storlek samt spänning. oss monterar sedan plastbatterihållaren åter i fjärrkontrollens lock, samt sätter mot sist igen metallnyckeln inom locket. oss kontrollerar för att fjärrkontrollen fungerar korrekt.


Infogat 13 November by ScegliAuto




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  • mercedes nyckel w203

    • Ever slid into your Mercedes, ready to hit the road, only to find your key won’t turn in the ignition? It’s enough to ruin your day. You’re left stuck, annoyed, and wondering what went wrong.

    Modern Mercedes keys and ignition systems are designed to be smooth and convenient — until they aren’t. Most of these issues have straightforward fixes.

    Knowing what&#;s going on can save you time, money, and stress, whether it’s a dead key fob battery, a glitchy ignition switch, or something more complex. Stick around, and we’ll walk through what’s causing the problem and how to get your car back in action.

    1. Key Fob Battery or Internal Electronics Failure

    Weak or Dead Key Battery

    A dead key battery is often the simplest explanation when your Mercedes key stops working. If you drive a model like the W C-Class (–) or the W E-Class (–), the key fob relies on a small coin battery to send signals to the car’s Electronic Ignition Switch (EIS).

    These batteries wear out over time, especially if it’s been a few years since you changed it or opted for a cheap replacement.

    How to Check and Fix It:

    1. Pop Open the Key Fob:

    For most models, press the small release button on th