Dodge 2013 Dart Owner's Manual page 224

222 UNDERSTANDING THE FEATURES OF YOUR VEHICLE
With the parking lights or headlights on, rotating the left
dimmer control upward will increase the brightness of
the instrument panel lights and lighted cupholders (if
equipped).
Instrument Panel Dimmer
Ambient Light Control
Rotate the right dimmer control upward or downward to
increase or decrease the brightness of the door handle
lights and ambient light located in the overhead console.
Door Handle/Ambient Light Dimmer