Nissan Altima (L33) 2013-2018 Owners Manual ≻ Instruments and controls ≻ Headlight and turn signal switch ≻ Instrument brightness control
Nissan Altima (L33) 2013-2018 Owners Manual: Instrument brightness control

Push the “+” button A to increase the brightness of instrument panel lights when driving at night.
Push the “-” button B to decrease the brightness of instrument panel lights when driving at night.

Daytime running light system (Canada only)
Turn signal switch