Yeah silviagod told me how to do it once, it was one of the relays by the washer bottle but can't rem which for the life of me. Also, the popup lights still lit up while closed. I actually wired a switch up to mine at the time which, when you fiddled between it, the stalk and the retract switch caused some odd results - I could make her wink :P
Edit: ooo, I found a pic, looks like it was next to the battery....