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or it sounds like the same problem i had. does the 'security' light flash, the interior lights come on, or door chime work? if none of these, it sounds like the sensor ain't working. i took my door panel off & saw that some idiot unplugged it before i bought the car.
look down the window channel by the latch. there should be three connectors plugged in. the 'door ajar' plug, if i remember right, is the one on top & closest to the interior side
Oh yeah, I remember seeing those plugs and they were all pluged in. There is a rod that attaches to the latch that slides a black plastic thing with prong's on each end. What is that for?
My Cavalier does that too. The computer will save your battery and turn off the radio after 20 mins, but it still isn't right. I'm thinking its the door switch.