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THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHRoll-over protection module
Leading reported evidence
Install with bolts only porsche can undo
Performed · outcome unconfirmed
No successful repair reported for this finding.
0
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0
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1
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Performed · outcome unconfirmed · Original poster
I got my hands on a replacement module and noticed that it must have been installed with bolts only Porsche can undo with a special tool because the mount points appear to have been cut.
Leading evidence: 'Install with bolts only porsche can undo' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Check durametric version' (1 discussions). For that action, 0 discussions report a resolution and 0 report an unsuccessful attempt. No action has an explicit, attributable resolution report under the current rules. These are forum reports and suggestions, not a confirmed diagnosis.
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Performed · outcome unconfirmed · Original poster
I tested for voltage on that wire and I'm getting a consistent 1.6 volts.
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Performed · outcome unconfirmed · Original poster
I used a combination of tools starting with my cable tone tracer and multimeter.
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Performed · outcome unconfirmed · Original poster
I used my Rocket Sockets to bite onto the bolt head.
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Performed · outcome unconfirmed · Original poster
I got my hands on a replacement module and noticed that it must have been installed with bolts only Porsche can undo with a special tool because the mount points appear to have been cut.
Counts describe captured discussions, not unique people or a diagnosis. Author identities are not reliably stored. Exact duplicate evidence is counted once across matching discussions; one discussion counts at most once per action/state. Multiple repairs reported together remain a combination. Suggestions and failed attempts do not establish a fix. Matches cover whole discussions and can include related faults, model variants and incomplete threads.
18 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
Rennlist: 1 discussions
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1 acknowledgements have no verified action link; they do not establish a repair result.
Does anyone know how to get past the plastic cover? I unscrewed the single screw on top but it still won�t budge. It appears to be on a pivot point but it won�t swivel open because the actual module case inside is blocking it. I�m kinda getting tired of breaking brittle plastic on this 20 year old car so I�m being careful. Appreciate your help
Yogi I've never messed with this part but since you're not getting any help I thought I'd try to sleuth a bit and see if I could find some answers for you. It's part #996-551-221-01. I found this picture of the bottom of it and it looks like it's just two plastic clips that grab onto a bolt or some section of the tunnel underneath it. I don't see any other mounting points - I saw the hole for the single screw you said you removed. If you search for that part number you'll see more photos of other angles, but this was the most revealing I could find of the underside. Can you reach in there and feel if there are bolts snugged up on either side? Otherwise it may be a prying situation.. If you break it - a new one is $38, so not terrible.
Hay appreciate you jumping in. There�s very little lateral play on those pivot point. I got my hands on a replacement module and noticed that it must have been installed with bolts only Porsche can undo with a special tool because the mount points appear to have been cut. The shell won�t pivot because the module is huge and it bumping into it on top.
I think I�ll be dealing with another issue once I get the shell off with those bolts 😢
I�m going to get medieval on it here in a minute. 🪓🪚
@theprf
thanks for the tip. It worked like a charm. So before I hack away at those proprietary bolts I decided to attach the new module to the car first. Same result. The ECU doesn't see the roll-over feature. My guess is it's not receiving power. I've traced most of the wiring back to the convertible top module for power but I believe the problem might be between the power source and the magnets that (I'm guessing here) sense a roll-over and trigger the loops to pop up. I've searched through pages of wiring diagrams and workshop manuals and can't seem to find the magnets.
Are they inside the roll-over module itself?
It would make sense but the diagram has them outside of the module.
I believe the magnets are the end of stroke indication for the pop up rollbars. Or they may be the release for the pop up rollbars. I don't know for sure. They aren't in the rollover module as the schematic shows wire leading to them. The roll over protection module's powered from fuse E1, you might check that.
That module you have there, that's the "sensor overturn M439" I take it? It's certainly not the power top control unit, it does not have enough wires going to it. In that case you might check if you have power between pin #11 and pin#2 on the connector to rule out a wiring break.
Yes, that's just the roll over module. The cabrio module is on the other end of that image M439. So if the magnets are part of the pop-up bars then it's not meant to detect the roll-over and trigger the event, right?
I'll check the fuse again.
I was able to get the module off the car w/o too much fuss. I used my Rocket Sockets to bite onto the bolt head. The was the only one that I had to use a heat gun to melt the threaded collar out of the unit.
Ok, I'm pretty green when it comes to reading wiring schematics but looking over it again it appears that it's getting power from the Orange wire. I tested for voltage on that wire and I'm getting a consistent 1.6 volts. That doesn't seem like a whole lot of power so I'm guessing either there's a resistance problem or this module uses very little electricity to function; which it's not doing at the moment. Neither module, new or old. Durametric states there's a communications error or the module doesn't exist.
With the key on you should get battery voltage between the orange and the brown wire. Around 12.4 volts with the engine off, 13.6 or so with the engine running. You need to use a very fine probe on the meter, as the pins are buried fairly deeply in the plug.
If you don't get this, then check for voltage between the orange wire and the car body (ground, bare metal).
Neither module, new or old. Durametric states there's a communications error or the module doesn't exist.
Durametric had an issue awhile back reading the rollover module. I helped them fix this issue. Make sure you are using the latest software.
Double check your meter by reading the battery directly. If the meter reads OK then you have a broken wire between fuse E1 and the rollover module. The orange wire goes through a connector X2/7 which is in the "footwell rear left" and that's where I'd start. The orange wire is pin# 16 on this connector.
Got it! I used a combination of tools starting with my cable tone tracer and multimeter. It was indeed on the driver side. It ended up being oxidation on the connectors. not to mention grime and filth of course. I bought some DeoxIT D5 and cleaned up the connector. Now I�m getting 12.3 v and the MIL is gone! Two MAJOR issues resolved! Cabriolet and Roll-over. Feels good to accomplish something. Thanks for your help!
Now I�m going to proactively clean ALL these main harnesses since I suspect there might be other gremlins lurking about.
on a side note my car is starting to behave like a sorted one. My door and key gongs are somehow now working. Baby steps.
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