Dodge Grand Caravan 2018 Owner's Manual page 67

The rear overhead console has recessed halo lighting
around the perimeter of the console base. This feature
provides additional lighting options while traveling and is
controlled by ambient light dimmer control of the head-
light switch.
Ambient Light Dimmer Control
GETTING TO KNOW YOUR VEHICLE 65
Dimmer Controls
The dimmer switch is located next to the headlight switch.
Instrument Panel Dimmer Control
3