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I had the same problem with mine chirping after the head unit was replaced. The installer couldn't find the solution so I took my 2002 Boxster S to a local Porsche dealer who fixed it while I waited. This is a quote from the dealer invoice: "Inspect radio contact wires as per customer supplied instructions. Wires already connected to harness ground. Removed and ran independent ground. No change of operation. Noted that the radio contacts are suppose to be normally open circuits. Removed grounds and tapped connectors. System now operating normally"...this solved the chirping and it never did it again...hope this helps!
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