Yes, they have.Not with automotive systems they haven't. Thought that was too obvious to include.
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The rumors we're hearing are only the whispers than make it past the cone of silence. Some of the people that Apple has hired are probably asking the same questions you are (only without the fatalism).They are already spending billions. If it was only a matter of money they'd have it wired. The real issue is experience with the systems, something that can't be readily bought or hired. Would they try to design and build their own electric motors from scratch or buy from an existing motor manufacturer with a long track record? Would they try to design and build their own braking and hydrologic systems? This is stuff they can't afford to get wrong. Doing this entirely in-house from scratch with no experience is a very risky proposition, but we haven't heard a whisper of rumor that they are talking to manufacturers of these parts. So something doesn't add up.