Volvo FM Handbook page 31

Instruments and controls
20
Symbol Meaning
Information
ACC (Adaptive Cruise Control)
Low split gear engaged
Main beam on
Front fog lamps on
Rear fog lamps on
Emissions-related fault
Battery not charging
Pre-heating on
Front wheel drive engaged
Differential lock engaged between the
front wheels
Differential lock engaged between wheels Flashes
Differential lock engaged between axles
Note
Lights up together with some other symbol or
together with a message on the display.
Green lamp = ACC has detected a vehicle. Red
lamp = collision warning, driver must brake.
Contact a workshop; a fault has occurred in the
engine which can have negative environmental
effects.