06 Sc430 radio suddenly loud buzzing

[GJJ]

My radio suddenly developed a loud buzzing and whining. Just had steering rack, power steering pump, and suction and return hoses from pump to res replaced.Also cabin air filter replaced. Help please.

[RX400h]

Quote

The buzzing and whining noise from your Lexus radio could be due to a few different factors:

1. Electrical Feedback from the Alternator: This is the most common culprit. The alternator’s electrical frequency can be picked up by an ungrounded audio connection, which then transmits a whining sound through the car’s speakers¹.
2. Ground Loop Interference: This can occur if there’s a ground loop issue with your RCA cables, especially if a new head unit or amp has been recently added¹.
3. Loose Wire: A loose wire from any of your stereo’s components and associated wiring can also cause a whining noise