How do you change the door code ona 1983 towncar?

Yes, it is a known issue on the Towncar. Advice in the link is to spray the catches and switch with WD40 or replace the switch.

https://repairpal.com/my-door-ajar-light-stays-on-most-of-the-time-511

https://www.google.com/search?q=2004+towncar+door+ajar+light+flashes

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to much spring load

this is for the base model

FUSE PANEL IDENTIFICATION (1983-90 LINCOLN TOWN CAR) The fuse panel is located in the instrument panel to the left of the steering column. To expose fuse panel, remove lower steering column finish panel.

Fuse & Circuit Breaker Identification

· 1 - 15 Amp Stoplights, Hazard Warning Lights, Speed Control Module, Trailer Tow Relays, Cornering Light Relay (1983-89)
· 2 - 8.25 Amp (Circuit Breaker) Windshield Wiper/Washer
· 3 - Blank
· 4 - 15 Amp Taillights, Side Marker, License Light, Parking & Coach Lights, Cluster Illumination, Trailer Tow Relay
· 5 - 15 Amp Turn Signal & Back-Up Lights, Trailer Tow Relay, Cornering Light Relays, Heated Rear Window Relay, Rear Defrost (1988-90), A/C Clutch & ATC Module (1990), Load Leveling (1990)
· 6 - 20 Amp Heated Rear Window Control, Speed Control Module & Clock Display, Illuminated Entry Module, Power Window & Police Accy Relays, Fuel Filler Door Release (1983-87), A/C Clutch & Cornering Lights (1983-89), Deck Lid Release (1987-90), Tripminder
· 7 - 10 Amp Daytime Running Light Resistor (1990)
· 8 - 15 Amp Dome LP-Clock, Key Warning Chimes & Electric Mirrors, Courtesy & Visor Mirror Lights, Autolight & Illuminated Entry Modules, Tripminder, Electronic Radio Memory, Trunk & Underhood Lights
· 9 - 15/30 Amp Heater Blower (15 Amp), AC/ATC Blower (30 Amp)
· 10 - Blank
· 11 - 20 Amp Radio & Power Antenna, CB Radio
· 12 - 20 Amp Door Cigarette Lighters, Power Seats & Door Locks (30 Amp), Tailgate Power Window (1983-89)
· 13 - 5 Amp Illuminated Outside Thermometer, Instrument Panel Lights
· 14 - 20/25 Amp (Circuit Breaker) Flash-To-Pass, Sun Roof, Power Windows
· 15 - 10 Amp Taillights, Parking, Side Marker/Coach, License Lights
· 16 - 20 Amp Horn & Front Cigarette Lighter
· 17 - 15 Amp Electronic Cluster, Message Center
· 18 - 10 Amp Warning Indicator Lights, Throttle Solenoid Positioner, Low Fuel Module & Autolight System, Dual Timer Buzzer & Electronic Chimes, Electronic Message Center

1-8-4-3-6-5-7-2

Distributor roatation is clockwise; odd cylinders are on left side of vehicle with #1 at left front.

On a 97 it is in the feul tank and it is electric. Ona 83 it is on the front side of engine and it is mechanical.

The code is on a paper label attached to a large plastic box containing several wiring harnesses behind the driver side door panel. Posts about it being on the trunk hinge arms, behind trunk panels, on computer module, behind the fuse box, and 'you have to go to the dealer' are incorrect for this series of Town Cars. After you remove the panel (you do not need to disconnect any wires), you will see the box up near the rear view mirror. An example code (3/4) (1/2) (5/6) (9/0) (1/2). If you press the keypad buttons in this order,left to right, the door locks will operate in the manner described in your opwner's manual.

Do a search on door panel removal to learn how to remove the panel. There are some good posts on this topic - some even have pictures.

1. Enter the five digit permanent entry code into keyless entry keypad.
2. Within five seconds of pressing last button of permanent code, press the 1/2 button within five seconds of pressing the last button of the permanent code. (Factory code found on the module).
3. Enter any alternate five digit code within five seconds of pressing 1/2 button.
   • Enter a sixth digit as follows to indicate operator's memory seat setting to be set by alternate code: 9/0-- no memory recall
     1/2-- memory seat position 1
     314-- memory seat position 2
     5/6-- memory seat position 3
     
   • After successful programming, the doors will signal by locking and then unlocking.
   
   

The Keyless Entry Module is located inside the drivers side door.

you will have to remove the front gaurd to get to the bolts

On the throttle body.

the door code is Usally Found on the Passenger side Trunk Hood support, If the 5 digit code is missing off this arm you might be able look at the underside of the Glove box area , Sometimes its also posted there, LAst Try is stop at for and see if records are on hand to give you the Ford code.