Suzuki SY413 Service Manual page 3397

FUNCTION OF EACH CONTROL COMPONENT
ECM
ECM output A/C control signal to A/C amplifier when ECM detect the following conditions.
D Engine coolant temperature:
above 1135C (2355F)
(below 1115C (2325F)
D Engine speed:
below 500 r/min. . . . . . . . . . . . . . . . . . . . . .
above 500 r/min.
. . . . . . . . . . . . . . . . . OFF
. . . . . . . . . . . . . . . . ON)
OFF
. . . . . . . . . . . . . . . . . . . . ON
AIR CONDITIONING (OPTIONAL) 1B-3