on all modern cars the cruise, is mostly the actions of software in the PCM. this logic is just a computer
you select cruise, and if the brain sees and error it aborts cruise.
that is so they dont get a lawsuit of $1.1billion dollars.
my point,< its bad now, and then next car will be worse.
same with remote start bs.
so what is the answer, well that is is easy
scan the PCM, connect any scan tool, that does all suzuki factory codes. like and Innova 3160 does.
scan it.
here is a generic list of possible logic fails.
1: brake lamp stuck on.
2: PCM sees you shift car , while moving, in cruise. (aborts)
3: PCM sees VSS errors. of ANY kind, some cars have 3 VSS in the tranny (unstated by you)
4: PCM sees TPS errors. throttle. or on newer cars 4 sensors for just this.
5: the cruise switch fails. (the cancel contacts fail, or the others there)
The FSM covers all this, under Cruise.
it tells you all logic fails and all tests.
and which DTC errors can cause it to fail.
$4
https://suzukipitstopplus.com/
but above if only USA, cars and yours is not.
ask your dealer for FSM
or get the car
serviced by any good mech.
they do , our you do,
but doing it manual free, is a hard row to hoe.