Most likely cause of this malfunction is a non-functioning headlight switch assembly. As the switch wears the springs that force the contacts from the dimmer switch to the electrical contacts that ground the signals for the lights wear as well and thus stop functioning correctly. Holding the switch back allows the contact to be "forced" so the lights will work. The headlight part of the switch has a similar problem there are springs controlling the three separate functions; "Off" (Daytime running lights) "Parking lights on" (Everything but headlights) and "Headlights on" (All lights on). You may be able to open up the switch and clean the contacts and get away with that for a while but your best bet is to find a car at the wreckers with low mileage and take it's switch, or pay the high price for a brand new one off GM.
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