I have a 2008 Mercury marquis and the door lock buttons, trunk lid button and remote do not work.
They will work intermittently. Is it the actuator, module or a short?
This is going to be difficult to diagnose without a hands on inspection. If its all door locks and truck you can rule out an individual actuator. Could be a relay or control moduel related but the last thing you want to do is throw parts at the proble. That tends to get expensive. Here is a link to find a shop near you.http://www.lkqcorp.com/en-us/
Alex
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Thank you Alex, I was thinking the same. Robert