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Join Date: Jul 2013
Location: Brisbane, Australia.
Posts: 471
Porsche 964 DME relay problem

The relay in my car is about 1 year old and today decided to stop starting.
I made some jumpers out of spade terminals, and sure enough, is starts perfectly, so I assume it is a bad relay. I order a new one.
The new one does not allow the car to start either.

Car is 1990, no airbags, and totally stock apart from cup bypass, and steve wong chip.

Any ideas where to look next?
Old 05-08-2018, 06:02 PM
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Join Date: Jul 2013
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Well, I found this article on the 993 here on Pelican, and it shows a couple of checks.. pin 30 is supposed to get 12V with the key off, and I have that.
Then with the key on, pin 86 is also supposed to show voltage (the photo shows 12V) but I am only getting 1.3, sometimes 3V.. so I am thinking this is my problem.

Web searching leads me to think either alarm problem or ignition switch.

Alarm - I think it only has the factory alarm, but I don't know where the module is.. I removed both seats and under one seat is just the DME, and the other seat has either cruise control or spoiler etc (I cannot remember but I looked up the part numbers at the time)

Ignition switch - replacement does not look too hard, but a switch will cost me $200 here, so I am hoping that's the fix...
Old 05-08-2018, 11:36 PM
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Well, ignition switch has been swapped but still won't start.
Now I am getting 11V at terminal 86....The fact that has changed suggests I was on the right track but why the strange voltage readings??
Old 05-14-2018, 03:29 AM
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