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Porsche 993: Why is My Power Window Not Working?

Working power windows are something we can take for granted, but what can you do if they stop working? Read this guide to find the solution.

By Jerry Perez - April 24, 2015

This article applies to the Porsche 993 (1993-1998).

You've had your Porsche 993 in storage over the winter, and all of the sudden your power windows don't move. Most of the time you could narrow down power window issues to three common components — the window motors, electrical wiring, and the actual window switch. Most of these fixes are rather straightforward, but if troubleshooting isn't your thing, then visit a professional repair shop.

Step 1 – Check the wiring

There could be cold wires.

Even if all your components are in perfect shape, they wont do anything if there isn't any power flowing to them. In order to check for bad wiring, you may need a voltmeter; check the wires around the window switch and motor to make sure they are "hot." If they aren't, then replace the wiring. Keep in mind that wiring could vary from driver to passenger side.

Figure 1. Damaged power window wiring.

Step 2 – Check the window switch

It could be faulty.

There are a few things wrong with the window switch. Follow these steps to rule problems out.

  • Remove switch and clean with compressed air and a damp rag. The switch could be dirty or sticky.
  • Check the fuse that operates the window switches. If burnt, replace.
  • Make sure the power wire is properly attached to it.
  • Make sure the wire that runs to the power window motor isn't damaged.
Figure 2. Window switch removed.

Pro Tip

In order to troubleshoot a faulty switch, you can always remove a working switch from the opposite door and try it on the malfunctioning one.

Step 3 – Check the window motor

It could be dead or stuck.

The window motor is what makes the glass pane move up and down the door. It needs power and proper lubrication in order to work. Follow this checklist to make sure the motor is working right.

  • Make sure the gears and window guides (or canals) are greased up to minimize friction.
  • Remove the door cover and use the appropriate Torx driver to manually turn the motor; it may revive it.
  • Check wiring to make sure that the motor is getting the necessary power.
  • Check the appropriate fuse (if applicable).
Figure 3. Window motor with Torx opening in the middle.

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