Help, whats this key for?

Harleyfan

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Aug 28, 2011
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C180 sport auto 1997
Hi all, as per my introduction post, happy bunny here got me a C180 sport in A1 condition today but have a small problem.

In the owners wallet is a red key type thing and on the key fob is a black one, any idea what it is? i am thinking maybe alarm or immobiliser as there are a couple of sensors by the windscreen but no idea where it plugs in, what it is or even what make it is.

If anybody can give any advice it would be really appreciated.

Dealer i bought it from had no idea.
 

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Ian B Walker

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Its an immobiliser key. Look for a round socket with a red light above it. Usually under the right hand side of the steering wheel. It has been known to have it inside the glove box.
 
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Harleyfan

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C180 sport auto 1997
Ahhhh, thank you, will have a look in the morning, the keys are not used as the car locks etc ok so when would i ever need to used it? sorry i probably sound really dumb but you are talking to somebody who's best car so far has been a picasso lol
 
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Harleyfan

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also may be worth finding out what make it is if i can as am wondering if the old insurance will go down a bit
 

Ian B Walker

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There should be another key fob with the car for remote locking. If the battery is disconnected the memory is lost and the alarm will sound. This key (the one pictured) resets the immobiliser.
 
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Harleyfan

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C180 sport auto 1997
i have the original key which locks the central locking. So is the one pictured an original manufacturer fitted one then, i wondered if it was an aftermarket added one
 

markjay

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I had a similar key on an older car (not MB).

The sounder usually has built-in NiCd rechargeable batteries, so that it will continue to sound even if the battery is disconnected (or the power cord feeding it ripped-out).

The key is meant to be used directly on the sounder (though I understand from the post above that in MB's case it is inside the cabin?) and stops it sounding, obviously for cases where the sounder goes wrong and won't quiet down.
 
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Harleyfan

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C180 sport auto 1997
thats brilliant, thank you, at least i know now. all i need to do now is find it so i know how to turn it off if the alarm sounds. Nothing about it in the manual so i was a bit confused
 

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