door locks not working?

1998 MERCURY MARQUIS
V8 • 2WD • AUTOMATIC
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PPRITCHARD
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1998 Gran Marquis. electric door locks and trunk button stopped working. Won't work from switches or from fob. Other electricals on the circuit work (seats, mirror). so it's not a fuse?
Dec 14, 2010 at 8:17 PM
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KASEKENNY
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So if the fuse is okay, and these are not separate issues then the common thing is the driver door module. Take a look at these diagrams and as you see the circuits all run through the door module.

To confirm this we need to go to the door module and measure voltage coming in from the lock switch and going out. Clearly you should have voltage in and out when pressing the switch. I suspect you will only have voltage in from the switch.

Here is a guide on how to test this voltage:

https://www.2carpros.com/articles/how-to-check-wiring

https://www.2carpros.com/articles/how-to-use-a-test-light-circuit-tester

So you will need to remove the door panel and here is a guide that will help with that:

https://www.2carpros.com/articles/door-panel-removal

Let us know what you find. Thanks
Dec 4, 2020 at 11:48 AM