Question about 2000 Mercury Grand Marquis
We had the same problem. You can remove the keypad by removing the inside door upholstery panel. The keypad module is held in with a sliding clip. Lots of harnesses etc to disconnect to get the thing apart , but the keypad came out fairly easily. You can open the keypad module by popping the clips around its perimeter. Inside is the rubber keypad button strip with a circuit board behind it. On ours there was oxidation on the circuit board. Carefully clean the circuit board with fresh water and a toothbrush (hopefully the traces haven't rotted through. If they have, you have to replace the module). Put the thing back together and seal the edges with a very tiny amount of RTV silicone to prevent further entry of water. This worked on mine, did the repair in August 2008.
Posted on Jan 01, 2009
Leave the light on in the garage!
Posted on Dec 01, 2008
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