When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
Hi,
I believe it's the electrical connection for the Wiper Door Safety Switch as mooser suggested.
The switch prevents current to the wiper motor until the door is fully open and the linkage pushes the button to close the circuit.
Regards,
Alan