Do E30's have Factory Immobilizer or Security?

[Z2TT]

Hi.

I have always wondered if the E30 have a factory immobilizer, or if it's an option dependant on model and how to identify?

I have a 325i and my owners manual mentions something about the secondary Key not being able to activate the Anti-theft.

Further reading on the web said there is some sort of magnetic part that only the master key can de-activate, and that the ECU goes into deadlock when doors are locked. I have no idea if any of this is true or not.

Thanks.

[Brianmoooore]

BMWs came with an option list. Go mad with the pen, ticking the boxes, and you could double the price of the car.
The immobiliser/alarm was an expensive option, comparable in price to a LSD, but many were specified. There were also a couple of BMW approved alarm/immobilisers that couldbe dealer fitted.
The magnetic alarm was a cab. thing.
The factory alarms only interrupted the ignition feed to the ECU and coil, so were hardly the last word in security. A piece of wire with croc. clips on each end connected between the battery + and the ignition coil + bypasses it in seconds.