Honda Outboards BF40A/BF50A Service Manual, Page 223Get this manual
HONDABF35A45A Operation
1) Trimming when the throttle switch is OFF (i.eover 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 intermittently 2) 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