Nikon D5500 - Manual (Page 168)

144 P, S, A, and M Modes
6
Check the results.
If the camera was able to measure a
value for white balance, the message
shown at right will be displayed and
a will flash in the viewfinder and the
camera will return to shooting mode.
To return to shooting mode
immediately, press the shutter-release
button halfway.
If lighting is too dark or too bright, the
camera may be unable to measure
white balance. A message will appear
in the information display and a
flashing
b a will appear in the
viewfinder. Return to Step 5 and
measure white balance again.