Join Date: Aug 2012
Location: Mt Vernon, IL
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When I bought my 2000 Ex, none of the locks worked and had the same symptoms as yours. YouTube has videos on how to fix yours, but I bought all 5 actuators off of eBay pretty cheap. They aren't terribly hard to swap out, and you can do all of them in a couple hours.
As far as the back up sensors go, if one doesn't work, none of them will. Have someone get in the driver's seat, turn the key forward but don't crank it over. Have them put their foot on the brake and put the vehicle in reverse (all while the vehicle is not running, mind you). Now, you go behind the vehicle and put your ear up to each sensor. There will be a clicking coming from the one or ones that do work. The one or ones that are not clicking are the failed component. Replace accordingly and that project is completed!
I've never had the lift gate failure to lock problem, so I can't help you with that one. Sorry! Good luck!