daytime running lights-99 gmc sierra

i,m having a problem with the lights flashing back and forth from the amber drl's to the headlights at night. it does this repeatedly. there is a clicking sound under the dash each time it happens. pretty annoying when i,m behind someone at a light or driving behind someone. they have to think i'm flashing my lights at them.

Prolly a controll module problem take it to your service tech and have them check it out

problem solved!- was BCM. diagnostic showed no info. replaced bcm ($452.00,total,labor and programming) also, stopped frequent "SECURITY" display on message board.
now to deal with that D*** fuel sending unit!