Question about 1997 Mercury Grand Marquis

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Reset lock code on door

Need to change lock code on door

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You must first put in your code then hold down the nine (9) button and push the seven button once. you should hear a lock sound enter your new code. Wish I had the code to mine.

Posted on Feb 20, 2014

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Posted on Jan 02, 2017

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Hi Georgia, try this

Before commencing, ensure all existing wireless door lock transmitters are
functioning correctly.
1. Locate the wireless door lock ECU. It is behind the centre
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2. Disconnect and remove the wireless door lock ECU from the vehicle.
3. Remove the four screws from the bottom of the wireless door lock
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4. Remove the four screws from the bottom of the wireless door
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6. Locate the code ROM within the wireless door lock
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7. Remove the code ROM from the wireless door lock transmitter
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8. Then slide the code ROM out of the ROM socket.

9. Locate the code ROM socket provided on the wireless door
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10. Slide back the retainer clip of the ROM socket.

11. Carefully insert the code ROM into the unclipped ROM socket,
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12. Slide the retainer clip of the ROM socket forward to lock
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13. With the wireless door lock ECU top cover still removed, reconnect
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14. Once in position, locate the reset button on the wireless
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15. At the same time, confirm ROM coding was established by
observing the extension LED. This LED will flash once to acknowledge that
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16. Carefully disconnect the wire harness from the wireless door lock
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17. Remove the code ROM from the wireless door lock ECU and
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18. Ensure the code ROM is secured and retained in the wireless
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19. Assemble the wireless door lock ECU and install into the
vehicle.
20. Assemble the wireless door lock transmitter. Ensure the battery is
installed with the correct polarity.
21. Check security system operation with all wireless door lock
transmitters.

Good luck

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