Keys and Fobs Your questions answered

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SteveD
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Keys and Fobs Your questions answered

Post by SteveD » Sat Aug 04, 2012 7:51 am

As usual we have a few threads about Keys/Fobs and I thought it might be a good time for a post that contained all the relevant information:

UK cars come with three keys, two black 'ordinary' ones and the grey 'Valet' key. The valet key does everything except open the boot and glovebox and can be used for programming (see later) and two fobs

Later cars may have the switchblade type key, this is in two parts and needs to be treated exactly the same as a separate key and fob when it come to programming.

All of the fobs (including the switchblade) are 4 button fobs made by Visteon. The fobs with the red button are for US cars and useless to us.


To programme the immobiliser to accept a new key* you need two working keys, one of which can be the valet key. The immobiliser chip is in the plastic part of the ordinary keys and in the plastic housing that the blade swivels in on the switchblade keys.

*The ecu can handle a maximum of eight keys, if you have eight in memory already it will mean a trip to the stealers to get them removed.

If you have two working keys and wish to programme the immobiliser to accept a third the instructions are HERE

The car can be programmed to accept a new fob/fob part of a switchblade without having any working ones to start with (up to a maximum of 3) and instructions are HERE

The part numbers are as follows:

4 button fob = Visteon 41844 this shows the location of the part number.

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Switchblade Key = Visteon 41787 these show the location of the part number

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A new blade can be fitted to the switchblade key by pushing this pin out:

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If you can think of anything I have missed please say and I will edit this OP :)

Hope that helps a few people
Last edited by SteveD on Sat Aug 04, 2012 11:55 am, edited 1 time in total.
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Re: Keys and Fobs Your questions answered

Post by danh » Sat Aug 04, 2012 8:27 am

Is it the top part of the switchblade key that contains the immobiliser?

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Re: Keys and Fobs Your questions answered

Post by Alera » Sat Aug 04, 2012 9:51 am

The transponder chip is in the key part.

By reading this it seems you need a minimum of 2 keys (can included valet key) to get another key added to the car.

This would be a problem for me as I only have one key currently and there doesnt seem to be a valet. See what the auto electrician says !
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Re: Keys and Fobs Your questions answered

Post by SteveD » Sat Aug 04, 2012 11:53 am

danh wrote:Is it the top part of the switchblade key that contains the immobiliser?

Good point, I'll add that to the OP
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Re: Keys and Fobs Your questions answered

Post by danh » Sat Aug 04, 2012 12:24 pm

Great. And thanks for the post, most informative.

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