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Discussion Starter #1
Hello,
Yesterday I noticed a loose connection on a BMW ecu box beneath my back seat. I plugged in the connector and put the seat back on. After that I went for a drive to check if my new battery did something for my misfire problems. I stopped the car and locked it up with the key. The car has a Gemini alarm but when I use the alarm the tailgate doesn't lock. (please don't ask). The procedure I use to start the car when its's locked is:
1. switch the alarm on with the remote
2. unlock the car with the remote
3. get in and start
When I did this the car failed to start and kept on blinking the indicators. What I do know now is that the ecu box was the factory immobiliser. After disconnecting the factory immobiliser the car still doesn't start. Does anyone know a procedure to clear the BMW immobiliser? Or any other way to start the car again?

Geert

94 M5 touring (3.8)
 

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GradjeD said:
Hello,
Yesterday I noticed a loose connection on a BMW ecu box beneath my back seat. I plugged in the connector and put the seat back on. After that I went for a drive to check if my new battery did something for my misfire problems. I stopped the car and locked it up with the key. The car has a Gemini alarm but when I use the alarm the tailgate doesn't lock. (please don't ask). The procedure I use to start the car when its's locked is:
1. switch the alarm on with the remote
2. unlock the car with the remote
3. get in and start
When I did this the car failed to start and kept on blinking the indicators. What I do know now is that the ecu box was the factory immobiliser. After disconnecting the factory immobiliser the car still doesn't start. Does anyone know a procedure to clear the BMW immobiliser? Or any other way to start the car again?

Geert

94 M5 touring (3.8)
Don't know if this helps but I have a similar thing with my car (Late 6speed 94 Touring Even the same colour)

The car has the built in alarm and for addtional protection and insurance it has an additional separate alarm.

Now the factory alarm operrates from the key and when I use it to lock the car it not only imobilises the car and sets the protection but also deadloacks the car.

I can also set both alarms and have both active at the same time!

Sometimes, although this happens very very rarely when I un lock the factory alarm it does not unlock cleanly and I have to un lock the car a second time by deactivating the factory alarm for a second time if I do not do this although the alarm does not go off the lights flash, I think this is normally caused by the alarm being set off and not deactivating properly.

Try deactivating the factory alarm for second time once the alarm starts flashing the lights try deactivating it again.

As for the tailgate lock this could be due to the alarm fitter as when I had the second alarm fitted when it locked the doors it unlocked the tailgate (or rather left it un locked) which them meant when I checked the car the tailgate opened and set off the alarm.

It appeared that when fitting the alarm it was providing a positive signal instead of a negative one which was easily solved.

I hope this helps. If not I have the owners manual which has more information about the in built factory alarm.
 

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Discussion Starter #3
Thanx fot the quick reply. I tried to open and close the car in all combinations possible, but still no luck. I have the car with a befriended specialist who will trie to get into the ecu with a tester. I hope he can shut off the alarm that way.
As to the tailgate; I will try to figure out if the alarm gives a positive signal. Do you have the cd-rom service manual? If so where do I find the alarm? I found the immobiliser under electrical systems but that's it.

Geert
 

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Don't know if this helps but I have a similar thing with my car (Late 6speed 94 Touring Even the same colour)

The car has the built in alarm and for addtional protection and insurance it has an additional separate alarm.

Now the factory alarm operrates from the key and when I use it to lock the car it not only imobilises the car and sets the protection but also deadloacks the car.

I can also set both alarms and have both active at the same time!

Sometimes, although this happens very very rarely when I un lock the factory alarm it does not unlock cleanly and I have to un lock the car a second time by deactivating the factory alarm for a second time if I do not do this although the alarm does not go off the lights flash, I think this is normally caused by the alarm being set off and not deactivating properly.

Try deactivating the factory alarm for second time once the alarm starts flashing the lights try deactivating it again.

As for the tailgate lock this could be due to the alarm fitter as when I had the second alarm fitted when it locked the doors it unlocked the tailgate (or rather left it un locked) which them meant when I checked the car the tailgate opened and set off the alarm.

It appeared that when fitting the alarm it was providing a positive signal instead of a negative one which was easily solved.

I hope this helps. If not I have the owners manual which has more information about the in built factory alarm.
This issue really intrigues me because it also did happen to my friend's car and we're still on the verge of searching for answers. Until now, we're quite confused on why it happen especially my friend who is really frustrated about his car. It seems Simonal has a good and reliable tips. I'm gonna let my friend knows about this so we could try giving it a shot to fix his car again. Thanks for sharing this.
 
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