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Welcome to AF.
Here are the most common problems with the two systems you are asking about.
1 - Intermittent or inoperable lift gate(not sure if you mean the glass or the lift gate itself) check for proper operation of the actuators. The actuators are simple stepper motors and are prone to locking up, also on the end of each actuator is a little rubber bumper that will wear down and fail to make full contact with the latch. Replacing the actuator will most likely be the only way to correct the problem.
2 - Wiper/Front On the motor there is a Control module PN 12463090 this is the brains for the wiper control system. I can't even begin to say how many problems people have expeirenced with these, ghost wipe, no washers, pulse does not work, ect ect....
If this is not the cause of the problem it may be the wiper switch inside of the steering column, while turning the lever to wash, strike the top of the coulumn above of where the lock cylinder is with your palm a few times and observe whether or not the wash function works. This is a crude way to test it but usually will work. this only works when there is an electrical short in the switch or corroded terminals.
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