i thought the coms2000 unit was part of the immobiliser system as well as the BSI module.

I'm qute sure the key reader plugs into the coms2000 unit.

Are you sue they've supplied the correct key as i've had it with dealers in the past where the model is on a change over year (different immobiliser systems fitted) and supplied incorrect chip type.

Take your original key to a locksmith/key cuting shop and see if they can identify the chip and then order a new chip to suit the new key.

Immobiliser chips are available from North West Key Services or Hicleys and not normally expensive.