Hi I found this on a forum Put the driver's window down, lift the bonnet and ensure all equipment is switched off. Ensure all doors are closed and remove key from the ignition. Wait for 3 minutes, disconnect the vehicle battery and wait 15 seconds. Reconnect the vehicle battery, wait a further 10 seconds (do not open doors.). Switch on the side lights through the driver's window. Switch on the ignition and check system's functionality. Hold lock button on key down for 10 seconds. Remove key open & close door test central locking system. Start the engine and complete the system's check. Failure to follow this procedure could result in incorrect operation of many BSI related items. the only bit that confuses me is: Hold lock button on key down for 10 seconds Do you do this while the ignition is on ?. I would have thought that it would not do anything. From experience if you have disconnected the battery the central locking will not work unless you shut the bonnet first, then lock and unlock the car. Any thoughts Thanks