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Before you replace the #46 HDM relay (in the fuse block under the hood) try exchanging it with the #45 cooling fan relay and see if your low beam lights work. If they do, the HDM relay (actually solid state module, not a relay) is bad.
there is a fuse for that circuit in the fusebox lower dash if this is ok check that your getting power to the high beam wire at bulb holder if not the part of switch for high beam isn't working if are getting power check the bulb holders for warping etc as can get very hot and mishapen so that the bulb doesnt always sit on the contacts but if bothe lights out i'd think its a power supply problem
My 2011 Traverse had no LOW BEAMS ( Right and Left Side )
I changed the LOW BEAM RELAY ( a 4 prong relay ) in the fuse / relay box located under the hood on the passenger side. It didn't change the situation. Voltage was good at the relay terminals and I plugged the relay into another GM car and it worked fine. The NEXT place the voltage goes to is the LOW BEAM HEADLIGHTS. The easier way to change them on a 2011 Traverse is to go through each wheel well - there is an access port behind the wheel well liner. YouTube has photos and videos on how to take this apart. Don't try to attack the problem from above in the engine compartment, the wheel well is the easier ( notice I said easier not easy ) way to go about it. BOTH of my Low Beam headlamps driver side and passenger side were burned out. I just bought the vehicle ( yeah...I know...who doesn't check the lights before buying a vehicle - right ? ) and at my wits end figured that it is such a pain in the rear to change the bulbs, that the lazy bastards that owned the vehicle just drove with one headlight and THEN the second one went out. If you can hear your low beam relay clicking ( you can feel it too if someone turns the headlights on with the key in the ignition turned to ON ) and you're getting 12 volts or higher at the relay terminals in both places ( the relay coil power and relay output terminals ) then the only thing next is the bulbs themselves. Thank God for small miracles. NOBODY likes an electrical / electronics problem.
The relay under the hood may have gone out. We had the same problem on our 2007 Buick LaCrosse CX. The bulbs were fine, high beams worked, all turn signals and everything except the low beams turned on. Turns out the relay had gone bad.
You have 1 high beam relay and a lo beam relay located under the hood. You also have 4 fuses under the hood, 2 are for high beam 10 amp and 2 for the low beam 1 is a 20 amp and the other is a 15 amp fuse. Remove the top off the fuse/relay power distribution center and look inside the top. It will tell you the location for each fuse and relay. hope this will help you.
There maybe a headlight relay under the hood, most are in a protective box. There may be a fuse also under the hood. Ck the fuse if there is one and tap the relays with you low beams set to be on. Good Luck, Ned