is it something in the steering column?

check the relay, it might be dead....

my bad, i need to read better. thought you were talkin about something else.

On my old Toyota there was a plastic snub that would click and hold into place.. it had actually broken off so I had a screw put in its place and it worked fine.

I have never taken mine apart, but on some rigs they have a kind of plastic cam you can buy and replace to fix it.

I imagine with Nissan, you have to buy the whole turn signal assembly.

Your best bet is to call a dealership and ask about it. If the price seems too high, hit a junkyard.

I believe it's part of the clock spring. It's a blue plastic part just under the steering wheel. You can purchase it from your local Nissan dealer.