Product: Original Engine Management HLS31 Headlight Switch
Overall sentiment: negative
Customer reviews:
Light switch is flickering the headlights. Detent is very touchy if you hit a bump they go out. Can jiggle switch to achieve same result. Poor quality 
 Does not fit 2002 Yukon Dinali. Electrical plug is not compatible. Will return and buy retail. 
 Didn't work right out of the box, sent back for refund. 
 2001 Yukon XL 1500 SLT its not the same. 
 Lasted 31 days. Just past the 30 day return window 
 Product overheats and shuts off, buy a better one! 
 Same issue as a couple of other reviewers. Bought this here at Amazon after a faulty switch purchase of scamBay had to be returned. It looks identical to OEM. Some others claim this is a Delco part. There are no Delco markings so I have my suspicions that this is your typical Chinese replica. Either way, it looks the part - looks great. The problem is quality... it's unreliable. Like others have said, when the lights are turned fully on, it's a hit or miss situation. Either the dash lights are off when the headlights or on, or I have to position it on parking lights to have the dashlights work. If I wiggle or put pressure on it while fully on, I might get lucky and have it work the way it's supposed to. Not cool. If I flip the switch 5 or 10 times, it works sometimes. Poor quality control. Maybe other batches work better. 
 Fit was great and lights operate properly. Illumination lamp is not very bright and adjustment knob does not rotate smoothly but overall the switch meets my need.

Update Apr 2017. Like many other review comments, this switch has started having issues. The dashlights and driving lights do not come on anymore. I can jiggle the switch but am unable to keep the driving lights on. No more driving after dark until I buy another switch....from somewhere else! 
 After a few months it started acting up. Lights are not turning on have to hit the device to work. :( 
 seems to have a little short in it. I can't figure the switch out. If i wiggle the control knob the dash lights go out. Wiggle again and they come back on. Don 't buy. 
 My garage said it fits my Yukon. However when I went to replaced it the wiring connector was different. Had to return it