NISSAN 2015 Altima Sedan - Owner's Manual - Manual (Page 319)

If the driver activates the turn signal while another
vehicle is in the detection zone, then the Blind
Spot indicator light flashes and a chime will
sound twice. LDW SYSTEM OPERATION
The LDW system operates above approximately
45 MPH (70 km/h).
When the vehicle approaches either the left or
the right of the traveling lane, the LDW system
will chime a sound and the LDW light on the
instrument panel will blink to alert the driver
The LDW system is not designed to operate
under the following conditions
● When you operate the lane change signal
and change traveling lanes in the direction of
the signal. (The LDW system will become
operable again approximately 2 seconds af-
ter the lane change signal is turned off.)
● When the vehicle speed is less than approxi-
mately 45 MPH (70 km/h).
LSD2117 LSD2101
Lane departure warning light
LSD2102
5-24 Starting and driving