Dealers are retards! These are all simple sensors. You could replace them with many aftermarket ones but that fact aside... there are a lot of sensors and the reason your trunk will not work is because by default your top is error state so until it is cleared by a Tech2 the computer will not allow it to open. The key here is fix the top the trunk should work afterwards. There is most likely a message of "Top not Secured" on your radio screen. If the top is secured, then it likely is an error to be cleared by a Tech2. Also, the hydraulic reservoir in the trunk on the passenger side under the plastic inner fender should be to the max line. Only use GM 88901975 on it! I am going to try an emulator for the Tech2 and see if I can access the sensors on mine.