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Just picked up a non-running 996; where to begin?

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Interesting update on the ABS/PSM issue. I dug into the electronics around the various brake/clutch switches. In a manual, I looked up the details on the Brake Light Switch and found that there are three wires: a signal going in (blk), one NO contact (blk/ye) and one NC contact (blk/rd) going out. These should oppose continuity at all times. Using a multimeter, I found that my switch didn't do that correctly. Instead, my switch had four contacts, with two pair being opposing NO/NC. See hand-drawn sketch below.


The part number on the switch was 96312343, which seems to be some generic p/n; certainly not the correct Porsche p/n. My research says 996-613-113-02-M100 is the right one. Correct one is on order from Pelican.


The PO had it switched in December; the shop must have used the wrong part but since the brake lights still worked (one pair of contacts was correct) they left it. Hacks.




Edited by Bay Arean
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The first diagnostic was at the smog center; the technician told me 3 systems weren't ready. "Go drive around, at least 100 miles," he said. 200 miles later, here I am.

Next I used my buddy's USB "PCM Scan" tool. It allows you to see the readiness flags for each module, as well as pull trouble codes. It doesn't show any faults.

But I used a real Durametric to get the ABS/PSM fault code earlier today.


Hey let me know if you need access to w PIWIS to resolve. Good job on the rebuild.

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The new brake light switch arrived from Pelican today. I tested the contacts and they behaved as would be expected from the wiring diagram. Got on the highway, and sure enough -- no PSM/ABS fault lights and the cruise control worked again! So the conclusion was: in December 2014 the switch was replaced with a similar one but with different internal wiring. One of the two contacts worked correctly, causing the lights to activate but the computer to know something was wrong.


I also tried the "OBD Drive Cycle" again, this time beginning with a cold engine. Followed the instructions to a T, and it was successful. My buddy's scanner showed all systems ready. I'll smog it this weekend.


Looks like this project is just about wrapped up!

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