Quote:
Originally Posted by IanA
... Switching on the ignition (which could be done easily by hot-wiring the switch or screw-drivering the key barrel) initiates the full start sequence with alarm off, fuel pump up to pressure, ignition made live, etc.
When the key/barrel is turned to start, the detector ring needs to read the key when the starter turns. Various codes are swapped at that time. If that is not successful, the fuel pump and ignition are switched off and the engine dies.
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I got that info from other BMW forums relating to other models (and personal experience of it on a Ford Escort Cabrio) but it does
not apply to my Z3. If the immobiliser is working, anything turning the barrel/ignition switch apart from the correctly programmed key does not start the engine.