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Re: door ajar light remains on
One of your door switches sounds faulty, usually drivers door goes first. There's a little push-in button sticking out on your door post or a small lever type plastic thing where your door meets vehicle, that is your switch. You can try spraying it with contact cleaner or WD-40 & working it in & out by pushing it with your thumb, it may fix it tempoarily, but if not, it will have to be replaced. If your mechanically inclined I can tell you how to test it.
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You replaced lift gate ,with a used one ? Did you replace door ajar switch with new one ? An what's this ovedrive ? Do you mean overdrive light ? If so the door ajar has nothing to do with that . When that light comes on you have a transmission problem .
This can be caused by a door or trunk being ajar, be sure you shut all doors firmly, if there is still no resolve check by shutting all doors then open one up and press the button (if any) on the inside of the door jam and see if it is broken or the light goes off.
The sensor switch in the door latch is dirty or may have been damaged. Thoroughly spray the door switches with a cleaning spray like carb cleaner. Then give it some canned air to blow out any remaining dirt. Then use a spray lubricant like WD40. After that open and close the door a few times and see if the light goes off when you close the door. If this doesnt work you'll need to take off the door panels to get a better view.
I have this same problem. A mechanic friend told me that basically the grease they use to grease the door latches cause a sensor to think the door is open. He said to buy something thtat will break up this stuck grease, but also has lubricating effects. I forgot what he told me to buy though.
When my "door ajar" light was on it was because the liftgate sensors (switches) indicated that the gate was open, even thought it wasn't. I took off the plastic trim, and took out the sensors - but that isn't necessary. Just soak with the switches with silicone spray, and see if that helps. There is one on each side of the liftgate - I believe both must indicate "closed" for the light to go off.
I have gotten replacement motors at Checkers for both driver and passenger doors - so now I have lifetime replacement motors.. The first time you replace them, a little drilling is needed on the door sheet metal, but it will not show up once the trim is reinstalled. This repair is a little involved, but well within the capability of a novice mechanic.
Removing a relay can cause all kinds of problems. The door ajar switch may have just need to be sprayed with a lubricant to unstick it so the lights would go off.reinstall relay to see if concers goes away.