Power window problems
 

Power windows work intermittently. Start car both driver and passenger window works. Drive a bit switches do nothing. Shut car off or open door and close windows may work.

????

Thats ? for 1988 911 carerra
 

Window problem relates to a 1988 Porsche 911 carerra

I'd start with the switches themselves. My SC had similar problems and I just replaced the switches and all was good. Just be careful to note the position of each connector.. not alot of slack in the wires, and you don't want to be trying to read the numbers on the back of the switch and then connecting the right wire to the right terminal.

Window switches.
 

If you can, swap out the P/W relay.

Also, clean the door switches.

Here's a little help.....

http://forums.pelicanparts.com/uploa...1342477869.jpg

http://forums.pelicanparts.com/uploa...1342477892.jpg

http://forums.pelicanparts.com/uploa...1342477912.jpg

Good advice above - start with the simple and replace the fuse and swap the relay. If that dosen't work, replace the switches.

In my case, the passenger window stopped working from both driver and passenger side switches. I replaced just the passenger door switch and the window started working from both sides.