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Question: Alternator whine after adding a DSP amp

EVNomad27Community StarterJul 26, 20262022 Toyota RAV4 Hybrid XSESeattle
2022 Toyota RAV4 Hybrid XSE, about 118,000 miles. System is clean with the engine off, but as soon as it starts I get a high-pitched whine that follows RPM. I already checked the obvious grounds. What is the most efficient order for isolating whether the noise is power, signal, or routing? I'm in Seattle. Appreciate any ideas on what to check first.
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3 replies

TruckDriver39Community StarterCommunity StarterJul 26, 2026permalink
Don't overfit one forum story to your car. If it still isn't clear on the 2022 Toyota RAV4, a specialist hour can be cheaper than another round of parts. Then you'll know the next fork. Post the numbers (or the code) and people can get more specific. Make the next action something you can finish this week. If the story changes I'll post the new data.
OldSchoolBuilder95Community StarterCommunity StarterJul 27, 2026permalink
Quick add on that: A second data point from another 2022 Toyota RAV4 owner helps more than a generic diagnosis. Then you'll know the next fork. If you share a photo of the worksheet, easier to sanity-check. I'd rather be boring and correct. Might be overthinking it, but I'd rather overthink than overspend.
TruckDriver39Community StarterCommunity StarterJul 27, 2026permalink
Write down what you already tried. A second data point from another 2022 Toyota RAV4 owner helps more than a generic diagnosis. I'd do that before spending real money. Post the numbers (or the code) and people can get more specific. If this is nothing, great. I want that in data.
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