31b is the toggling trigger -- momentary input only, or you'll fry it. This is the wire from the turn signal switch that's normally not connected on U.S. market cars. Find it taped up by the wiring harness above the left fender near the firewall.
15 is fused power, used only to flash the high beams with the light switch off.
81a gets jumpered to 15.
56 is power from the headlight switch.
56a is power to the high beams (or armature power to a high beam relay).
56b is power to the low beams (or low beam relay).
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