I have a competing theory from another forum where some are proposing a red-yellow-orange-brown-black order. Here is their analysis:
"First, 5 volts is a standard voltage for electronic controls.
Well, just looking at the printed circuit traces, I see a couple of things.
The thicker traces on red and black suggest these are Positive and Negative (often called Common/GND when you're dealing in electronics, but it's definitely NOT AC power safety ground).
The conventional color choice for + is Red...... and the preference for - is Black ... and the polarity of the capacitor strongly suggests that was done here.
The mystery orange/brown wires both do the same thing. They go to a "device of some kind", probably a switch or light, and the other side of the device is black (- or GND)? That would be very conventional.
And here is the takeaway from that: if you exhanged brown and orange, most likely all that would happen is the lights or switches would be exchanged; e.g. it would light up ERROR and not ON instead of the other way 'round like it's supposed to.
The 3-prong thingie in the middle looks an awful lot like an infrared sensor and the schematic seems to match up.
I think the schematic is this. (
https://electronics.stackexchange.com/questions/649949/what-is-this-component-and-did-i-make-this-schematic-correctly) "
I did measure resistance from each wire to chassis ground and came up with all open circuits. The multi meter did record reistance between several points on the sensor board, so I know its operating correctly.