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I took this from an old post.
"At least for the FR-S, I know that there is a relay (white/offwhite box) in the fuse box labeled "DRL" that controls both the high beams as well as DRL function, not sure about the BRZ though because it's headlights are OEM hid and LED boomerang DRL. If that relay were the issue then both headlights wouldn't be able to have DRLs or high beams not one. I suggests pulling or tugging on the wires coming from the pins on the connectors with the high beams on to see if it flashes on that side or something."
That might be worth a try.
humfrz
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