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Old 9th April 2009, 10:17   #1
tony_fry
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Default Key Fob Programming!!

Can anyone on the forum members help me with this one?

When I brought my 75 it only had one key!!

I had brought the car a few days before I went on a 3 week holiday, on returning, I went to start thew car and the battery was dead, no problem I went to a local motor factors and brought a replacement battery, I thought that would be the end of the problem, but I had a "engine immobilized" warning light on the IPK.

The long and short of it all, I had to get a replacement key from a ex-dealer, which is working fine.

Whilst I was down with Ralph's @ EMS this week having a new speedo head fitted and a session on the T4 making a few adjustments, I took the original key that opens the doors on the plip buttons and fits the the barrel but the immobilizer part is not recognized on the ECU or whatever it connects to, I was told that you should be able to reprogram they key, but they told me it can not be done as I do not have the bar code that relates to the key, I was under the impression that the T4 should be able to read the code from the key? and the T4 is only for programming the opening and closing of the doors using the remote?

I would like get the original key working again as a spare, does anyone know if it is possible to get the immobilizer part of the key reprogrammed without the bar code or if you could get the bar code from anywhere?

Perhaps Keith, Lates or anyone that knows about the T4 might be able to answer this one?

Regards
Tony
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Old 9th April 2009, 10:32   #2
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You do require the bar code or original Information that came with key I'm afraid.
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Old 9th April 2009, 10:35   #3
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The ECU needs the barcode information to link to the key. Without it it's a useless paperweight I'm afraid regardless of what most eBay sellers state.
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Old 9th April 2009, 10:42   #4
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Many thanks for the info John,

You might be able to answer my next question in that case, is it possible to override the immobilizer system, I have a seen threads on the "other side" that you can?

I have a CAT1 Clifford alarm fitted so I do not need the original alarm system or immobilizer working.

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Tony
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Old 9th April 2009, 10:47   #5
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Quote:
Originally Posted by tony_fry View Post
Many thanks for the info John,

You might be able to answer my next question in that case, is it possible to override the immobilizer system, I have a seen threads on the "other side" that you can?

I have a CAT1 Clifford alarm fitted so I do not need the original alarm system or immobilizer working.

Regards
Tony
Thats like asking if you can open the bonnet when you have a broken release mechanism etc.. We are not allowed to discuss it on this forum due to the potential for abuse.

I'd recomend going to an alarm specialist and getting it done by the professionals.

Or go to Croydon and leave the windows open. Either way the end result is the same. :lol:
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Old 9th April 2009, 10:51   #6
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Steve,

I was not asking for information about disarming the immobilizer, just if it is possible!!!



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Tony
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Old 9th April 2009, 11:02   #7
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From what I understand, if you fit new batteries to the keyfob, you then stand near the car and press the fob button 4 times. That should reset it.

With a T4 (laptop) you can read the numbers of any key that has been used previously. i.e. when my mech was adding my new key he found two numbers already entered, but not knowing which was for the existing key he did not cancell either of them, he just added the numbers from my new key, (a plastic label was attached to my new key with a bar code on it) making a total of three key numbers..

Hope that helps a bit..

NOTE--- the new key cost me £152. And still had to be "registered" in the cars ecu (?)..
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Old 9th April 2009, 11:13   #8
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The immobiliser is nothing to do with the battery in the keyfob, buttons or barcode, they are for the remote locking.
The immobiliser is a passive chip in the keyfob and is 'read' by the coil round the lock.

A new key is supplied with the chip already programmed to one of the codes held in the immobiliser ECU, the record of them is held by BMW in Germany.

Last edited by raykay; 9th April 2009 at 11:15..
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Old 9th April 2009, 11:13   #9
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MMM, my original key must still be registered on the ECU because I can still open and lock the car, it just the immobilizer part that's not working, I know there is a chip on the inside of the key fob, and that is what seems to be the problem, I don't know how this is programmed in the first place, its just very strange how after the cars battery went flat, the immobilizer chip could not be read by the ECU after a car battery replacement.
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Old 9th April 2009, 11:16   #10
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surely if the original key has already been used before the cars battery went dead, he will not need a barcode as the key should already be registered with the ecu,
if the original key was fine before cars battery went dead and then he purchased a new key , surely both keys should now work?
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