Door Locks and Power Windows in 1989 Laredo -
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Unread 10-18-2015, 09:10 PM   #1
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Join Date: Oct 2015
Location: SF Bay Area, CA
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Door Locks and Power Windows in 1989 Laredo

I have read lots of similar threads, but haven't found my issue. I have a 1989 Grand Jeep Cherokee Laredo

I read that the window guides need to be lubed up to fix slow power window opening. I used silicone spray lube and got all windows working great, but then my front passenger window got stuck down. I unplugged the motor power connector and found I had 12 volts when I pressed the switch. So I ordered a new motor/regulator assembly. I bought one with a connector right on the motor, Dorman 741-539 Jeep Front Passenger Side Window Regulator with Motor, knowing I have to modify the stock inline connector wiring to extend the wires to the motor. It cost half as much as other options. Amazon says it fits my vehicle.

But once it arrived, I started by double-checking the problem and had no voltage on the motor connector now when I press the switch. I unplugged the large epoxy sealed connector on the back of the switch and found I had no voltage going to the switch.

I found a fuse block diagram and saw that there is just a single pole relay there for the power windows. I unplugged it and confirmed none of the windows would go down.

I'm thinking there must be another fuse somewhere I blew by poking around with my multimeter. If so, where is it?

Just as I was giving up, I found that the switch for the power door lock wasn't working either. So that is a clue, but does anyone know the solution?

I have read all about the grounding issues, but this seems more like a fuse issue.

Thank you in advance!

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Unread 10-19-2015, 12:28 PM   #2
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Another possibility I just thought of: There has been a little bit of rain that has gotten into the open window. Could that have caused there to now be no power to the window switch on the front passenger door - or for the automatic door lock from the driver door to have stopped working?
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