Volvo FM Handbook page 158

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DLC becomes active. On trucks with two driven axles,
the differential lock between axles will also be
engaged.
The differential lock is engaged automatically when
the driving wheels rotate at different speeds and the
speed is less than 15 km/h.
The differential lock is disengaged if the speed
exceeds 15 km/h or at the next gear change.
Overview of the switch's functions
Switch position
0 (upper position)
1 (centre position) and TCS
engaged
1 (centre position) and terrain-
TCS engaged
1 (centre position) and TCS
disengaged
2 (lower position)
Switch position
0 (upper position)
1 (centre position) and TCS
engaged
1 (centre position) and terrain-
TCS engaged
1 (centre position) and TCS
disengaged
2 (lower position)
Function
No differential lock engaged.
DLC active.
DLC inactive.
DLC inactive.
The differential lock is manually engaged.
Function
No differential lock engaged.
The differential lock between the axles is engaged.
Automatic engaging and disengaging of the
differential lock between the wheel pairs
depending on the speed conditions according to the
above description.
The differential lock between the axles is engaged.
The differential lock between the axles is engaged.
The differential lock between the axles is engaged.
Differential locks are engaged between each wheel
pair.
Driving 147

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