How do I reset lift gate on 2004 lincoln navigator. It doesn't open or close anymore with the remote

Maybe your key fob needs a new battery !
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.

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.
   This system can also set DTC'S
2. POWER LIFTGATE MODULE DIAGNOSTIC TROUBLE CODE (DTC) INDEX (BODY CLOSURES) 501-03 Body Closures 2004 Expedition/Navigator DIAGNOSIS AND TESTING Procedure revision date: 08/23/2004

   Power Liftgate Module Diagnostic Trouble Code (DTC) Index
   

   Power Liftgate Module Diagnostic Trouble Code (DTC) Index
   
   DTC Description Source Action B1342 ECU Is Defective Power Liftgate Module INSTALL a new power liftgate module. REFER to Power Liftgate Modulein this section. B2477 Module Configuration Failure Power Liftgate Module REFER to Section 418-01. B2522 Vbatt1 Circuit Failure Power Liftgate Module GO to Pinpoint Test B. B2552 Vbatt2 Circuit Open Power Liftgate Module GO to Pinpoint Test B. B2698 Vbatt2 Circuit Failure Power Liftgate Module GO to Pinpoint Test B. B2699 Left Pinch Strip Open Or Short To Battery Power Liftgate Module GO to Pinpoint Test B. B2700 Right Pinch Strip Open Or Short To Battery Power Liftgate Module GO to Pinpoint Test B. B2701 Left Pinch Strip Stuck Active Power Liftgate Module GO to Pinpoint Test B. B2702 Right Pinch Strip Stuck Active Power Liftgate Module GO to Pinpoint Test B. B2703 Open/Close Switch Stuck Active Power Liftgate Module GO to Pinpoint Test B. B2704 Optical Sensor Power Short To Ground Power Liftgate Module GO to Pinpoint Test B. B2705 Optical Sensor 1 Input Not Active During Powered Gate Movement Power Liftgate Module GO to Pinpoint Test B. B2706 Optical Sensor 2 Input Not Active During Powered Gate Movement Power Liftgate Module GO to Pinpoint Test B. B2709 Gate Open Output Short To Battery Power Liftgate Module GO to Pinpoint Test B. B2710 Gate Close Output Short To Battery Power Liftgate Module GO to Pinpoint Test B. B2711 Gate Open Output Short To Ground Or Open Power Liftgate Module GO to Pinpoint Test B. B2712 Gate Close Output Short To Ground Or Open Power Liftgate Module GO to Pinpoint Test B. B2713 Unlatch Output Short To Ground Or Open Power Liftgate Module GO to Pinpoint Test B. B2714 Uncinch Output Short To Ground Or Open Power Liftgate Module GO to Pinpoint Test B. B2715 Cinch Output Short To Ground Or Open Power Liftgate Module GO to Pinpoint Test B. B2718 Gate Ajar Output Short To Battery Power Liftgate Module GO to Pinpoint Test B. B2721 Gate Ajar Output Short To Ground Or Open Power Liftgate Module GO to Pinpoint Test B. B2722 Open/Close Switch Active During Self-Test Power Liftgate Module GO to Pinpoint Test B. B2723 Glass Position Switch Active During Self-Test Power Liftgate Module GO to Pinpoint Test B. B2724 Forkbolt Switch Invalid During Self-Test Power Liftgate Module GO to Pinpoint Test B. B2725 Detent Switch Invalid During Self-Test Power Liftgate Module GO to Pinpoint Test B. B2726 Home Switch Invalid During Self-Test Power Liftgate Module GO to Pinpoint Test B. B2819 Gate Motor Circuit Short To Battery Power Liftgate Module GO to Pinpoint Test B. B2820 Gate Motor Circuit Short To Ground Or Open Power Liftgate Module GO to Pinpoint Test B. B2821 Cincher Motor/Unlatch Actuator Short To Ground Or Open Power Liftgate Module GO to Pinpoint Test B. B2822 Cincher Motor/Unlatch Actuator Short To Battery Power Liftgate Module GO to Pinpoint Test B. B2825 Movement Ceased Due To Excess Speed Deviation Power Liftgate Module GO to Pinpoint Test B. B2903 Chime Output Circuit Short To Battery Power Liftgate Module/ Liftgate Chime Module GO to Pinpoint Test C. C1935 Chime Circuit Failure Power Liftgate Module/ Liftgate Chime Module GO to Pinpoint Test C. U1950 UBP Communication BUS Fault UBP Communi cation REFER to Section 418-00. U2338 Invalid ACM Message Data Power Liftgate Module