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Forum => General Smart Chat => Topic started by: cheapshots on March 15, 2017, 02:58:35 PM

Title: Smart forfour 454 immobiliser fob?
Post by: cheapshots on March 15, 2017, 02:58:35 PM

Hi guys,

My 1.3 Pulse semi auto 454 has a key with remote lock/unlock but also a separate immobiliser fob. After unlocking the car with the key, you have to touch the immobiliser fob on an area close to the steering wheel so that the metal plates make contact, then, with the immobiliser disarmed you can proceed to starting the car.

I've looked at other 454's online but none seem to have this immobiliser fob... Is this an extra? Also, I have a second immobiliser fob which doesn't seem to disarm the immobiliser, any idea how I can bring it back to life?!

Thanks :)

Title: Re: Smart forfour 454 immobiliser fob?
Post by: Ocracoke on March 15, 2017, 03:03:53 PM

I don't believe that this is a standard ForFour feature so it could be aftermarket. The standard immobiliser in the ForFour is tied to the ignition key's coding. I guess the battery in the second fob needs replacing?

Title: Re: Smart forfour 454 immobiliser fob?
Post by: cheapshots on March 15, 2017, 03:24:01 PM

I'll take a picture of the immobiliser fob and the 'metal contact' later today and show you guys. I don't think there's a battery inside the immobiliser fob... I'll check again :)

Title: Re: Smart forfour 454 immobiliser fob?
Post by: CrazyG on March 15, 2017, 04:49:32 PM

That sounds remarkably like a Thatcham Category 2
immobiliser has been fitted...probably because the owner
lived in an area where the insurance company demanded
it was fitted as they lived in a 'high risk' car theft area.

The keyfob will not have a battery...it is a transponder
type that is used, and the second keyfob is possibly not
for the same car...or if it is, then it is damaged.

Title: Re: Smart forfour 454 immobiliser fob?
Post by: cheapshots on March 15, 2017, 09:50:40 PM

You're spot on CrazyG... I googled what a Thatcham Category 2 immobiliser looks likes and it's exactly what my car has. Yes the fob is a transponder - no battery and it doesn't work, so I'm down to one transponder. I'm going to call my insurance company tomorrow and haggle down my premium!

Title: Re: Smart forfour 454 immobiliser fob?
Post by: cheapshots on April 11, 2017, 04:54:26 PM

For anybody who might be interested, it was a Cobra Touch Key Override Fob. I ordered one for £15 from eBay and programmed it using the enclosed instructions (very simple). Cheapshots.

Title: Re: Smart forfour 454 immobiliser fob?
Post by: CrazyG on April 11, 2017, 05:36:25 PM

And that 'Overide' thingy does what precisely ?

Title: Re: Smart forfour 454 immobiliser fob?
Post by: cheapshots on April 11, 2017, 05:58:24 PM

It's a misleading name, its basically the fob used the disable the Thatcham approved immobiliser (made by Cobra).

Title: Re: Smart forfour 454 immobiliser fob?
Post by: CrazyG on April 11, 2017, 06:01:33 PM

Ah...ok. thx for clarifying that.  ;)