Daytime Running Lights
 

Hi. 1997 Elantra, 161K km. After using the parking brake on a STEEP driveway, the Daytime headlights stopped working, though they are fine when 'turned on'. Funny thing is, they came back for a brief period, then went again. All the other lights work in 'daytime' mode, and the headlight bulbs and fuses are OK. Any ideas?