Honda PIONEER 2022 Owner's Manual page 218

Rear Suspension Adjustment (SXS1000M3D Trail/M5D Trail only)
The rear suspension can be adjusted for rear passengers and carrying
heavier cargo by changing the damping.
Do not attempt to disassemble, service, or dispose of the damper;
see your dealer. The instructions found in this owner's manual are
limited to adjustments of the shock assemblies.
Rear Suspension Damping (SXS1000M3D Trail/M5D Trail only)
Refer to Safety Precautions on page 137.
REAR
The damping adjuster has 3 positions for different loads or driving
conditions.
Position 1: use in low payload conditions at low speeds.
Position 2: standard position.
Positions 3: use in high payload conditions such as 5 passenger
loading, and/or at higher speeds.
Make sure that both shock absorbers are adjusted to the same position.
2
3
1
damping adjuster
Suspension
Servicing Your Honda 209