Our center console screen says "navigation door open, close unit door or install dvd." I cannot find a reference to this in the owner's manual and the navigation is not working.

The dealer normally will update your system. Also look for a reset button at top of system. I have had an issue with mine and that fixed it.

Do you have power lift gate ?
The power liftgate may not operate under the following conditions:

• a low voltage or dead battery.
• a disconnected battery.
• a power liftgate that has been left open for more than six hours.
• a power liftgate that has been manually closed and left ajar.

If any of these conditions has occurred, the power liftgate must be reset before performing any pinpoint tests. For additional information, refer to
Power Liftgate Initialization NOTE: If the power liftgate system is turned OFF in the message center, the system cannot be activated with any switches or with the liftgate handle. The system will need to be turned ON for any power operation to occur.
NOTE: The power liftgate may not operate under the following conditions:

• a low voltage or dead battery.
• a disconnected battery
• a power liftgate that has been left open for more than six hours.
• a power liftgate that has been manually closed and left ajar.

If any of these conditions has occurred, the power liftgate must be reset.

1. Manually close and fully latch the power liftgate.

1. NOTE: If the power liftgate does not open during this step, refer to the symptom chart to diagnose the power liftgate for no operation.
   Power open the power liftgate by using the keyfob or overhead console switch.

1. Once the power liftgate is fully open, close the power liftgate by using the keyfob or overhead console switch

I would suggest an owners manual

If you own a vehicle,why would you not want one

Helm.com

Have to order & buy it

Dealer will give you the same site

SECTION 501-12: Instrument Panel and Console 2003 Expedition/Navigator Workshop Manual
REMOVAL AND INSTALLATION Floor Console -Front, Navigator Removal and Installation

1. Apply the parking brake.

1. Position the front seat forward.

1. Remove the two front floor console rear bolts.

1. Position the front seats rearward.

1. Disconnect the battery. For additional information, refer to Section 414-01 .

1. Remove the pin-typ retainer and the window control switch panel.
   • Disconnect the electrical connectors.

1. Move the shift lever to NEUTRAL and position the shift indicator bezel aside.

1. Remove the screws and the center console finish panel.
   • Disconnect the electrical connectors.

1. Disconnect the shift cable.

1. Disconnect the front floor console electrical connectors.
   1. Loosen the electrical connector bolt.
   1. Disconnect the connector.
   1. Disconnect the electrical connector.

1. Remove the front floor console side finish panel.
   • If equipped, disconnect the electrical connector.

1. Remove the front floor console front bolts.

1. Remove the floor console.

Check fuses #21 40 amp check relay jump 12 volts to motor circuit
Overhead Console Removal

1. Disconnect the battery ground cable.

1. NOTE: Remove the interior lamp as a unit.
   Ease out the interior lamp.
   • Disconnect the electrical connectors.

1. Remove the overhead console screws.

1. Remove the overhead console.
   • Apply an even downwards force to both sides of the console.
   • Disconnect the roof opening panel switch electrical connector (if equipped).
• Disconnect the information and message center electrical connector (if equipped)

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SECTION 501-17: Roof Opening Panel 2001 Cougar Workshop Manual REMOVAL AND INSTALLATION Procedure revision date: 02/8/2001
Roof Opening Panel Motor Removal

1. Remove the overhead console. For additional information, refer to Section 501-12.

1. Disconnect the sliding roof motor electrical connector.

1. Disconnect the sliding roof panel relay.

1. Remove the sliding roof motor control unit.

Installation

1. To install, reverse the removal procedure.

radio anti-theft. Should have a code card you got with vehicle. might be stuck in your owners manual.

it looks like you disconnect the shift cable and remove the center console finish panel with the shifter.


SECTION 501-12: Instrument Panel and Console 2003 Expedition/Navigator Workshop Manual
REMOVAL AND INSTALLATION Floor Console —Front, Navigator Removal and Installation

1. Apply the parking brake.

1. Position the front seat forward.

1. Remove the two front floor console rear bolts.

1. Position the front seats rearward.

1. Disconnect the battery. For additional information, refer to Section 414-01 .

1. Remove the pin-typ retainer and the window control switch panel.
   • Disconnect the electrical connectors.

1. Move the shift lever to NEUTRAL and position the shift indicator bezel aside.

1. Remove the screws and the center console finish panel.
   • Disconnect the electrical connectors.

1. Disconnect the shift cable.

1. Disconnect the front floor console electrical connectors.
   1. Loosen the electrical connector bolt.
   1. Disconnect the connector.
   1. Disconnect the electrical connector.

1. Remove the front floor console side finish panel.
   • If equipped, disconnect the electrical connector.

1. Remove the front floor console front bolts.

1. Remove the floor console.

Unless it has been stolen, it is unlikely the disc is missing.

This disc the error references comes installed inside the navigation unit that is underneath the driver's seat.  There is absolutely no reason to pull the disc out, unless you are replacing it with a newer disc.
  It is possible to accidentally hit the unit with your shoes or while vacuuming the floor in that area.  Check under the driver's seat and make sure that the unit's door is not open.  If you still have a problem, then open the unit's door all the way, press the eject button and check the disc for scratches. If no disc comes out, then you are definitely going to need a replacement. If a disc comes out, check it for scratches and reinsert it if it looks ok (as it should).  Then close the unit's door and retry to use the navigation system.

Installing the DVD Map Disc Your dealer/retailer may have installed the map DVD. If the map DVD was not installed, do the following to load it:
Read the following steps completely.

1. Turn the ignition on. The vehicle must be in P (Park) to perform this operation.
2. Press (power) to turn the navigation system on.
3. Press the NAV hard key.
4. Touch the Insert Map Disc screen button. The screen opens to access the map DVD slot.
5. Load the map DVD partway into the slot. The system pulls it in. The screen cannot be closed until a double beep is heard.
   Notice: Pressing directly on the navigation screen may cause damage. Repairs would not be covered by the vehicle's warranty. Do not press directly on the navigation screen.
   
6. To close the screen, slightly push up on the two outer corners until the screen is in position. Then push the screen in by pushing on the four outer corners until a click is heard.
7. Set the search area. See "Setting the Search Area" earlier in this section.

Ejecting the DVD Map Disc The navigation portion of the system cannot be used if the DVD map disc is not loaded.

1. Press the MENU key to enter the Menu options, then press the MENU key repeatedly until Nav is selected or touch the Nav screen button.
2. Touch the Map Database Information screen button.
3. Touch the Eject Map Disc screen button. The screen tilts, exposing the map DVD slot.
4. Press the eject button, located next to the DVD map disc slot, and the disc ejects. Pull the disc out. The screen cannot be closed until a double beep is heard.
   Notice: Pressing directly on the navigation screen may cause damage. Repairs would not be covered by the vehicle's warranty. Do not press directly on the navigation screen.
   
5. To close the screen, slightly push up on the two outer corners until the screen is in position. Then push the screen in by pushing on the four outer corners until a click is heard.