Last week i changed the wiper motor in my 03 envoy, now having some weird syptoms. First, as soon as i finished, when i started the truck, the headlight washers would spray automatically. Next day when i shut off the car, the radio and lights stayed on even when i opened the doors with keys out. Ok... What the heck. Now today, the service airbag light came on! What is going on with the electrical? The wipers work now, but any insight on the aftermath please??