Honda GL1800 2004 Owner's Manual page 57

Cargo Compartment
To open the trunk, push and hold the trunk release button for approximately
one second.
Call Mode
The call mode is provided to let you locate your motorcycle when it is parked in
a large lot.
Push and hold the CALL button, the horn will sound and the turn signal lights
will blink two times.
CALL button
When the ignition switch is in the ON or ACC position:
You can lock and unlock the compartments.
The trunk release button will not operate.
The call mode will not operate.
50
Before Riding
trunk release button