Question about 1990 Porsche 944

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1990 porache 944 cabbriolet

The car was stored for two years now the top and wipers wont work fuses are good i have no owners manual thank for your help rich

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  • bsinergie1 Nov 07, 2008

    I have gotten everything working but the wipers. I even bought a new wiper motor installed it and it still does not work. What is the problem?

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Relays are used extensively on these cars and are located in several locations. The relays tend to build up material on the contacts that results in high resistance on the contacts, and therefore incorrect voltage and current levels across the contacts. If left in one position for a long period of time (as in sitting unused for two years) they will corrode in place -- so if you are turning a circuit on, the contact will not open or close as designed, and the circuit does not become activated.

There is a high probability that the wiper motor has a relay somewhere (I dot not know if that is so for certain). It could be one of the relays in the fuse box on the fender well or more likely, mounted some where near the motor. Find the electrical circuit diagrams online (yes, they are out there). Somewhere on the circuit that includes the wiper motor will be shown the relay (if there is one) and notes where it can be found.

As for the convertible top, the relays are located in a little cluster underneath the metal shelf that goes from one rear wheelwell to the other. On my 1990, it is screwed to the top of the wheel well on the pasenger side, and you can find it by removing a small piece of carpet. It is a really noticeable "bump" out that is visible looking from the open trunk. Look at the right rear corner of the trunk opening and then look down. There is not a similar shape on the other side, so it should be obvious. The carpet pulls away if you are careful (it goes inside the car around the flip down seat headreast); you probably want to lower the headrest for easier removal.

Posted on Mar 29, 2009

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The top on my '91 S2 cabriolet also wouldn't open when i bought it about three years ago. the electrician tested the motor and it was working with direct power. turned out it was the relay that prevents the top from retracting when the car is running. We didn't find where the relay was located but we ran a bypass and added a secondary relay to the bypass located behind the tray under the radio. now ist good as new as new. before u do that though,m try lifting the top's lip while pressing the switching, that can keep the motor from starting as well. good luck.

Posted on Nov 08, 2008

  • 944diehard Oct 08, 2014

    The relay is located on the inside of the driver's side rear wing, behind the side carpeting.

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