How do you turn off a corsa van that has a chipped key?

To turn off a Corsa van with a chipped key, insert the key into the ignition and turn it to the "off" position. If the key isn't recognized, try gently wiggling it while turning, as this may help establish a connection with the ignition system. If that doesn't work, you may need to use a spare key or have the chipped key reprogrammed by a professional. In some cases, disconnecting the battery can reset the system, but this should be done with caution.