Hi, I pretty much follow the logic behind the central door locking mechanism of the DeLorean. Together with the parts and workshop manual it's easy to understand if you have a bit of technical background. However, the thing I don't understand is the need for a 'lock position sensor' that disables the whole mechanism when the locks are 'out of sync'. In other words, why is it so bad when the locks become out of sync for whatever accidental reason? Sacha -- >From now on my e-mail address is <sacha@xxxx>. Please update your address book if I'm in it.