Honda Outboards BF40A/BF50A Service Manual, Page 221Get this manual
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POWER TRIMTILT SYSTEM
The BF35A45A has type equipped with the power trimtilt system which hydraulically raiseslowers the outboard by simply pressing on the switch
""-' 1Power trimtilt motor drive system
The power trimtilt switch and power tilt switch are installed on the control knob of the remote control box and on the left side of the outboard under casePress on the either one of these switches, and the relay activates and controls the rotating direction of the motor, and the outboard is raisedlowered by the hydraulic cylinder