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Radio/PCM going nuts - need help in PD

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It is on my 05 CTT with Bose system (fiber optic connector to radio).
So I was driving the other day and just happen to break on the hard side, and noticed that the radio unit reset itself (screen went black, then Porsche logo came on, then back to radio).
It did that a couple times. Got home, removed the radio (which was hot). Unplugged the wires in rear of the unit. Left as is (had something to do).
Later, plug it all together, and all seems fine. For about a week.
Today, driving to a friend, same thing, radio reboots itself. See the Porsche white background with logo, then sometimes to to radio, and sometimes goes blank again.
Since then, nothing seems to work. When unplugged, noticed unit was very hot again (the heat sink in rear and the chassis too).
When made the car quiet, noticed that there was an amp or something else from the rear of the car, I could hear a fan spun up trying to cool whatever it was that was running. When I unplugged the connector paired with the fiber optic connector the fan on whatever piece of hardware stops running after about 5 seconds. Towards the end of troubleshooting, noticed that when the connector is plugged in, the fan is not running when I become quiet (but that could be due to the unit not being hot yet).
Resets itself many times if left alone. When I press the 1+4+8 buttons to reset, it will, but sometimes will go blank until I reset again. sometimes press the power button to turn it on, it will, but when radio comes on, I can only work the controls for about 2 seconds (enough to change station or volume a bit). After I do the one thing I can, the buttons will not work. Have to reset the unit again. Then back to square 1. Either buttons do not work, or will for just a short time again just like earlier.
So now, ended up disconnecting that connector (which cuts the power off to the unit). Hoping someone on here can give tips to do PD and hopefully resolve this issue. Thanks in advance.
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When I removed the PCM, noticed that the heat sink the metal part on rear of the unit that the voltage regulators connect to, was getting really hot. Didnt happen to notice any cooling fans in the unit.

If you look at the pic, the heat sink is the only thing I noticed. Do not remember a fan inside, is there?

Have you noticed if the cooling fan in the PCM unit is operating?


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  • 2 years later...

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