Played with my light aimer, ratted from a junkyard BMW door mirror. I'm ignoring the "up" sign, and mounting it sideways so there will be a better arrangement of the mounting points for the light bracket and two fasteners on the high side for the base.
Connect 12V across the leads to get the following results. There are only three leads.
Motor 1 - Red -ve / Common (Brown/White) +ve - Left Motor 1 - Red +ve / Common -ve - Right Motor 2 - White -ve / Common +ve - Up Motor 2 - White +ve / Common -ve - Down
With #1 son came up with a wiring plan for the up/down axis.
Temporarily mounted light on half-made bracket and trial fitted. Minor adjustments and trims needed, but this could work!