DFL Warning Light

[honestlow]

Anybody knows DFL waring light.
This morning, when I turned on my Honda Civic 2002, there was a yellow warning light DFL beside the SRS light on for a while, and come with some clipping noise. The light was on all the times until turn off the engine.

and I tried to show the problem to the service tech at dealer's place. unfortunatley the light never come back. and everything back to normal.

Tried to turn on and off the engine for few times. never saw that light again. Can not find the related message on the manual as well.

Anyone knows what is the problem?
Anyresponse is appreciate.