Honda BF35A-BF45A Outboard Motors Shop Manual., Page 222Get this manual
1Turning the power trimtilt switch or power tilt switch ON the UP side, the UP relay in the power tilt relay activates, contact point moves in the direction shown by the solid line and arrow, electric current flows in the direction shown by the broken line and arrow, and the motor rotates in the normal direction2) Turning the switch ON the DOWN side, the relay in the power tilt relay activates, contact point moves in the direction shown the dot line and arrow, and the motor rotates in the reverse direction -2Power trim warning system
The BF35A 45A is equipped with the warning system which sounds when the trim angle exceeds 20 so that the power trim can be used at the safe cruising angleHowever, as the power tilt is used for the maintenance and cruising in shallows, the warning buzzer does not sound when the throttle angle is below the set angle with the shift lever in neutral, reverse, or forward position