2002 GMC Envoy Q&A

2002 GMC Envoy Question: what could be problem for the tailgate not to lock/unlock, an my wiper not work?

the lock tryes to lock makes noise but it don't move,and my wipers don't do any thing. i have change black control box on it and that is not it. could it be the wiper switch? -
Answer 1
Lock actuator needs to be replaced. FRONT wiper motor gives some trouble as well. -