Honda BF35A-BF45A Outboard Motors Shop Manual., Page 223Get this manual
1) Trimming when the throttle switch is OFF over the certain set throttle angle with the shift lever in forward position andor reverse position)The unit detects the voltage when the trim angle sensor exceeds the certain set angle, turns the transistor ON and OFF at regular intervals, and sounds the buzzer intermittently2) Tilting when the throttle switch is ON (i.eunder the certain set throttle angle with the shift lever in neutral, reverse, andor forward position)The buzzer does not sound independently of the trim angle sensorThe buzzer also functions for the oil pressure alert systemWhen the power trim warning system and the oil pressure alert system operate simultaneously, the buzzer sounds continuous beep for the alert of the oil pressure
POWER TRIMTILT FUNCTION
1) Power tilt (including cruising in shallows): Hydraulically raisestlowers the outboard the designated position by pressing the buttonA range where is not under the large thrust such as for cruising in shallows, mooring, etc(range of 20-60 in the drawing 2)Power trim: Adjusts the balance of the boat while acceleration or cruising, resulting in improved acceleration, maximum speed, operationability, and fuel consumptionRequires large lifting power as the outboard is under the thrust while operation (range of 0-20 in the drawing 3) Reverse lock: Maintains the reverse thrustWhen collision with the obstacles the water, it unlocks to absorb the impact4) Shock absorber: Reduces the impact when the reverse lock is released