Question about 2003 Lincoln Navigator
Electronic's , aren't they great ? There is a control module (power lift gate module ) Switch (sensor) inputs to the module . Lift gate obstacle detection strip right and left , liftgate cinching motor ,liftgate unlatch motor .Liftgate drive motor assemblys left and right . Probably a bad switch feeding bad voltage signal to the control module ! Like one of the obstacle detection sensors maybe. Could possibly have DTC'S - diagnostic trouble codes stored in the control module. Your best bet maybe to have the dealer run diagnostic's on it , check for codes . Need a factory or professional type diagnostic tool to do this. I would say you mite be able to check the sensor inputs to the module , don't know what or how much voltage > Some of these circuit's are a five volt signal from the module . Ohm check the obstacle detection sensor ? I still think best thing would have it checked for DTC'S . Almost forgot about the thing opening when you close another door , All the modules on the vehicle are connected on what is call a serial data network . Doors have modules inside as well .could be commanding that door open some how.
If you would like to see what your up against , here is a web site for free wiring diagrams http://www.bbbind.com/free_tsb.html Enter vehicle info. year , make , model and engine size. Under system click on body & accessories , then under subsystem click on power liftgate. Click the search button ,then the blue link. The second diagram down starts liftgate diagrams . Good luck !
Posted on Sep 06, 2017
check relay and fuses,make sure that automatic liftgate is on. You will have to to the command center and go through the defaults and make sure that the system is on. if you are not comfortable doing that, disconnect battery for approximate ten minutes, this will reset the system defaults.
Posted on Jul 23, 2009
HilAry when the lift gate goes to the open position does it make a grinding noise when it reaches the fully opened position and then closes, If so the gear driven assembly may have had a tooth broken on one of the gears and has striped out causing the gate to fall back down. If this is not the case meaning there is no grinding noises coming from the gate then you have a ecm module that operates the functions of the gear driven unit telling it when to stop and go down. If this is the problem you might want to take it to the dealership to program the new unit. I hope this helps.
Posted on Dec 18, 2011
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