Honda JAZZ Owner's Manual page 401

uuWhen DrivinguShifting
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Shift Up Indicator
Shift Up Indicator
400
Comes on while the vehicle is in the 7-speed
manual shift mode to indicate when a shift
change is appropriate to maintain the most
fuel efficient driving style.
The shift up indicator: Comes on when
shifting up is recommended.
1Shift Up Indicator
WARNING
3
The shift indicator is only a guide to help
you achieve better fuel economy.
Never refer to the Shift Indicators when
road and traffic conditions are unsuitable
or when it may distract you.
Ambient meter colour may change if you do not
change transmission when a shift indicator
illuminates. This can result in a change in fuel
economy.
Road and traffic conditions may require you to shift
at times other than those indicated.