I have a 99 durango. About a year ago, intermittently, when I would use the remote to lock the vehicle, I would note that the horn would not sound but the vehicle would lock. The next time I would start the vehicle, the CHECK ENGINE light would be on while running. No error code. After so many starts the CHECK ENGINE light would go out. Have not been able to establish a relationship between the CHECK ENGINE light and the door locks. About 8 weeks ago, the driver side back door latch failed in the totally locked postition. Stayed that way for about a week. I notice that it was unlocked at one point and replaced it with a new door latch. The new latch is now in the failed locked position. The parts people at the local dodge dealer seem to think the latch has failed. To get the skin off, there is 2 screws at the bottom of the door that need to come out (besides the other screws.) I haven't figured out how to stand on my head and get a screw driver in there to remove them with the door closed. The skin should have enough room to remove after the screws have been removed. My real need is, what relationship does the door remote, horn and latches have with the CHECK ENGINE light?