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About thejackamo

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    Cayman GT4

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  1. So this project finally got tackled this week! Since I’d originally posted, another forum member had got in touch with me saying he was undertaking the same swap and was running into a couple problems, namely that the minimum volume level was too loud and that there was a ton of crackling/popping. I’ll address those further in the post, but first I wanted to answer the questions that past-me had: What circuit(s) is the 12V radio power connected to? – the PCM is on a constant / always-hot fuse. The PCM itself controls the amp wake-up signal, so I wired the amp wake-up separately to a
  2. Hi all, I'm in the midst of planning a bit of an unconventional PCM replacement and wanted to see if I might be able to get some feedback on a few questions that have popped up as I've gotten along in the process. Long story short, the PCM 3.1 in my 981 GT4 has been replaced twice now due to the prior units essentially going into an endless reboot cycle. And before you ask, it's not the XM problem—the PCM doesn't even power on long enough to be functional, essentially like the PCM in this 991. I'm now on the 3rd unit and am pretty much done with Porsche OEM head units; the latest rep
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