I have '02 Grand Marquis. My Keypad on the door quit working last week. I can still use my remote to unlock the door. What should I check? I know how to use multi-meter, and have a degree in electrical engineering.
My 02 Crown Vic did the same thing. Turned out that the memory had erased my personal setting numbers when I disconnected and cleaned the battery posts. Try re entering the original factory code and see if it works again.
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