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"Why 200 rpm more? I keep wondering."
Yes, good point. It sounds like an even number planned to keep the AC compressor's intermittent load from taxing the idle speed regulation loop. I don't recall if you found that number in the literature, but it does sound good. What I can't quite get a sense of, is whether you're seeing "200" as a couple needle-widths on the instrument cluster tach or measuring it with something giving you a few rpm's resolution.
Checking my notes on pin 14 and 15, I can't tell how the pin should look open circuit given the circuit is on the hybrid. But I did notice one unexplained difference between the 561 and a 933 I have to look at. The 933 has an unused pull-up resistor option (R215) which, on my example, looks to have been placed and then removed when the 9XX gets configured. The -933 is configured to mate with an EGR version of EZK.
I connected the 933 to power and saw only 150mV from either 14 or 15 open circuit, like you saw, so I doubt this is your fix, unless the harness on your car brings in some noise on those wires, which could be eliminated by your grounding them. Where do those wires go in a car with the standard climate control?
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Art Benstein near Baltimore
The 50C5 was introduced in 1948, to address concerns that the set might pose more of a shock hazard to the user if the 35W4 and 50B5 were to be accidentally interchanged. The 50C5 is a 50B5 with a different pin-out.
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