There is a problem on a current model-year GM vehicle in which data communications from the audio system are throwing out JUST enough stray RF to cause false tire-pressure monitor alerts. Allow me to give a couple of non-TDI examples: That SHOULD cure the noise, but bear in mind other systems may be getting interference too which can cause erratic behaviors and you have not addressed the root cause-which may or may not become a bigger problem at some point. In the case of such a harness problem, probably the easiest fix for the noise is to put biggish inductors in series with each side of the power supply lines to the radio and amp (if there is one). That could indicate a bad ground or some other harness-related issue where stray RF from the alternator is finding it's way into the audio system. Let us know what happens.Ĭlick to expand.Unlike the OP, I'm guessing your problem goes away when the radio is off? If not, do you have an external audio amp? What you describe sounds like alternator whine to me. While it's relatively rare, malfunctions of this nature have been known to drain batteries while the car sits idle. With the onset of cold weather upon us, do not delay this repair. It's the only source of power to the speakers and should be turned completely off when the radio is turned off.
The fact that the noise doesn't go away with the radio shut off says to me that there is something awry in the audio output IC (Integrated Circuit or "chip"). If you don't have an external amplifier, just change the radio out. If it does go away, the culprit is *probably* the radio head. If you have an external amp, pull the fuse for the radio head (it should be separate from the amp fuse) and see if the noise goes away. It is extremely unlikely that this failure has anything to do with a data bus, IMO.
While I have no direct experience with VW systems, pretty much all systems operate the same on a nominal level with the biggest differences among carmakers being data communication formats.
The following is based on my years of warranty experience with OEM car audio systems. If it does, the problem could be there and that will complicate troubleshooting. You'll want to check and see if your car's system uses an additional amplifier external to the radio head. It sounds like the amplifier chip in the radio head has gone squirrely-a VERY common problem in virtually every system that uses those stupid things-and most these days do use them.
Speakers cannot make sound without power applied to them by some external power source.
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