That should have read:

This problem has been mentioned previously on www.vectra-c.com a few times. I can't remember the exact reason, but it's something like a faulty wiper motor or the park postion sensor inside the unit. A search over there should be able to find it.

Glad it's not just us then.

it will require a new motor, the park mechanism is built into the motor, Regards TB

Someone on Vectra-c.com has stripped down the wiper motor and repaired the parking mechanism. The earth connection to the microswitch inside the motor assembly becomes detached. You have to drill a small hole in which to pass a wire through the casing and solder to the microswitch to create a new earth connection.

http://www.vectra-c.com/forum/showthread.php?t=90019

You'll need to register an account to see the above link as it's in the how2 section.

Avant, from what I recall, there was a space between the words "a few times" and the full stop. For unknown reasons I was unable to remove the space, or use the keyboard arrows to place the cursor in the correct spot. I tried pressing the delete key but the space wouldn't delete. Even after submitting the post I was unable to then go back and edit out the spaces or question marks that magically appeared. As the post was clearly wrong after I posted it, I copied the original words, then pasted them making sure that I did delete the space and question marks. The result of those actions can be seen above.

Hope that helps? Dave.