Windows wont go up or down

Asked by Guru8LQKB Dec 31, 2019 at 11:39 AM about the 2009 Mercury Grand Marquis

Question type: Maintenance & Repair

the windows wont go up or down. It doesnt even make a
sound when you try.

1 Answer

10,910

Have you checked for voltage and ground? Make sure the lock out switch isn't engaged. Because you open and shut the driver door, so much, sometimes those wires in the wiring harness, hinge side, break. Something to check. You can see the fuses at top of diagram, check those. You can use a test light to check voltage and ground at wire harness on hinge side of driver door. Yellow wire with light green tracer is voltage to master switch. The bottom black wire, right, in the diagram, is ground. You can use test light to check that also. To check ground, one end of test lite touches battery voltage, the other end touches black wire terminal, if lamp comes on, you got ground good enough for lamp. I suppose the master switch could have a problem, won't know w/o testing. Don't replace anything unless your testing points in that direction.

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