Question about 2003 Lincoln Navigator

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Liftgate/ running boards problem

My 2003 navi. running boards and power liftgate stopped working. is not under warranty anymore and local dealer says that it needs a new power liftgate module, which will fix these problems. i replaced the fuses, so that is not the problem. is there a such thing as a power liftgate module? this will be an expensive repair, so i need to know if the info is accurate from the dealer!!
thanks for any feedback offered!!
tobi farley

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  • lisanbutterf Oct 18, 2008

    The exact same thing happened to me this week. My dash reads liftgate ajar and the running boards won't deploy. The dealer proposed the same solution...liftgate module as the needed fix.

  • Anonymous Dec 14, 2008

    I have a 03 doing the same thing

  • Anonymous Dec 16, 2008

    Same with my 03. Anyone get this fixed themself? And how much?

  • Anonymous Dec 21, 2008

    I have same problem. But mine will work for a couple days if i reset everything by taking off the battery cables. My will also all of a sudden work when its cold outside and i will get out of it and to running boards will suddenly deploy. WTF?

  • kmurdock1964 Jan 02, 2009

    I have the same problem. liftgate ajar light comes on and liftgate do not work plus the running boards will not deploy. i found that by removing the 5th fuse located on the left (7.5) then putting it back in, the running boards and liftgate works. Also this problem only occurs when it's cold outside. 25 & below. i bought the vehicle in april. no problems when its warm.



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I have seen many times the deale just reprogram the gem and it starts to work again

Posted on Jan 02, 2009

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I had the same problem and the dealer replaced my power module. if you can invest in an extended warranty. Mine covered the module. It paid for itself just with that fix alone.

Posted on Jan 07, 2009

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Yes, all accessory functions are controlled by one or more control modules, this problem most likely is the GEM, Generic Electronic Module

Posted on Oct 22, 2008

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I replaced the pcm and mine still wont open with fob or switch! running boards also not working. dealer said it was the pcm! do i have to reset the pcm after install to get it working?

Posted on Jan 12, 2010

  • pocketcrocke Feb 02, 2011

    I need to find some good quality running boards. Anyone know where the best place is to get them? I need them pretty soon.


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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 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 !

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SECTION 501-03: Body Closures 2003 Expedition/Navigator Workshop Manual
REMOVAL AND INSTALLATION Power Liftgate Module Removal and Installation
NOTE: Prior to removal of the power liftgate module, it is necessary to upload module configuration information to a diagnostic tool. This information needs to be downloaded into the new power liftgate module once installed. For additional information, refer to Section 418-01 .
  1. Remove the rear quarter trim panel. For additional information, refer to Section 501-05 .
  1. Remove the power liftgate module.
    1. Disconnect the electrical connectors.
    1. Remove the bolts.
  1. NOTE: Once the new power liftgate module is installed, it is necessary to download the module configuration information from the diagnostic tool into the new power liftgate module. For additional information, refer to Section 418-01 .


Principles of Operation
The power liftgate is controlled by the power liftgate module.
The power liftgate module receives inputs from:
  • glass position switch (determines the ajar status of the liftgate glass).
  • forkbolt switch (determines the primary position of the latch).
  • detent switch (determines the secondary position of the latch).
  • home switch (determines the power cinch status).
  • power liftgate control switch (activates the power liftgate from the interior of vehicle).
  • pinch strip switches (determines if an obstacle is detected between the pinch strip and liftgate).
  • instrument cluster module (activates and sets the options for the power liftgate).
  • optical sensor (determines the direction, travel speed and obstacle detection of the liftgate).
  • UBP serial communication link.
The power liftgate module sends outputs to:
  • liftgate motors.
  • power cinching latch system.
  • liftgate chime module.
  • body security module

The liftgate consists of the following components:
  • liftgate window glass latch
  • door lock actuator (power liftgate only)
  • liftgate latch
  • liftgate handle
  • liftgate latch remote control (power liftgate only)
  • liftgate ajar switch
  • chime module (power liftgate only)
  • -------------------------------------------------

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