Dodge 2015 Challenger-SRT - Owner Manual - Manual (Page 143)

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).
Dome Light Position
Rotate the left dimmer control completely upward to the
second detent to turn on the interior lights. The interior
lights will remain on when the dimmer control is in this
position.
Dimmer Controls Instrument Panel Dimmer
3
UNDERSTANDING THE FEATURES OF YOUR VEHICLE 141