How do I turn on backlight?

click link below for the manual, Be passant it takes a while to download..
http://demandware.edgesuite.net/aayf_prd/on/demandware.static/-/Sites-masterCatalog_Nixon/default/dwe2d7f3fa/manuals/nixon-unit-dive.pdf

Found this

https://www.ifixit.com/Guide/Nixon+Watch+Battery+Replacement/44278

http://www.amazon.com/Duracell-D377B2PK08-Watch-Calculator-Battery/dp/B0040E30Z4/ref=sr_1_12?ie=UTF8&qid=1436821235&sr=8-12&keywords=sr66+watch+battery&tag=ifixitam-20

I would exchange it for another.

I have this same problem just yesterday! Any solutions??

here is the manual
http://www.nixon.com/uk/en/manuals/nixon-unit.pdf

click this link for instructions
http://uk.nixon.com/manuals/nixon-unit.pdf

For the actual time press the "B" button once, the top screen should say "AL". Now Press the "D" button until the alarm/chime goes away.

replace battery

Hey, this just happened to my nixon watch (I have the nixon housing - same setup as the lowdown) and what you have to do is simply hold in the light display button for about 3 seconds and the display won't disappear after the light times out.

hope this helps :)

This is not done in the alarm section. In the time view, press and hold the wave#/reset button (lower right) until it beeps (3 seconds). That's it. The watch should be silent now when cycling through and on the hour.