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2004 Cayenne Turbo- I could use some help figuring out  the source of a leak and how it managed to kill both the radio head unit and the sub.  A week ago the PCM 2 head unit stopped working.  Black screen and no sound output.  Checked all the fuses and all were good.  Upon closer inspection I noticed the screen on the head unit and buttons would glow slightly when the power button was pressed.  


A few days later I happened to be under the loading truck floor because I needed the tool to remove a headlight.  That's when I noticed the water.  It looks like there was about 2-3 inches of water at the bottom of the wheel well.  I removed the sub and discovered that the amp and associated wiring had been submerged.  There is not rust anywhere so I am thinking this was recent. 


I am assuming this is what killed the head unit....but is it?  I need to discover the source of the water (it has rained here quite a bit) and decide on the best course of action.  Replace head unit and sub with new aftermarket or buy used and put it back together with OEM parts. 


As I side note, my windshield washer pump also died about the same time.  Anyone have an opinion on the source of the water and whether to go aftermarket or OEM on the replacement radio?



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  • 4 weeks later...

I’m not sure what you have for roof rails but there are a lot of holes up there at the bottom of a channel that holds a lot of water. Those holes for screws are sealed with rubber thats getting old

I removed my roof rails because I never use them to carry anything and put clear vinyl wrap over and I’m very happy that this is something I never have to worry about


here is a picture of the bottom of the roof rails so you can see the rubber protection. I changed out my rear hood shocks two years ago and saw a rust on them that only could’ve come from the roof so it definitely leaks somehow. That’s the only way I can think of for that much water to get in.


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