Re: 2011 DRL Replacement Issue
Please don't take this wrong because I did this when I did mine so this could be it. The DRL will only come on with the vehicle running and in Drive, Neutral, or Reverse. The will not come on if the Emergency Brake is applied either. Get someone to sit in your GC with the brake applied so it doesn't roll away then check your stock bulbs.
If you already did all of that, my bad sorry!