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By using the proper code - like 12321 or whatever your code is. You put the code in and then press 1-2 to open doors 3-4 to open back doors and 5-6 to open the trunk. When exiting you press 7-8 and 9-0 together to lock everything.

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11y ago
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Q: How can you unlock your grand marquis mercury using your keypad?
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