LEN/05gxp, the TSB'* for current GM models is mind boogling, so You have to take the initiative to inform Dealers of them at tmes so they get it right. This is one of those times.
Give them the text and TSB number I have listed below and tell them a new lower fog lamp wiring harness has been made to put them on the right track.
EXTERIOR LIGHTING:FOG LIGHTS Bulletin Number: 050842013
Bulletin Date: SEP 2005
Vehicle: 2005 Pontiac Bonneville
FOG LAMP INOPERATIVE, FOG LAMP BULB BURNS OUT PREMATURELY. ( NHTSA ITEM NUMBER - 10017571 )