What about parking lights off, key off so there are no DRL’s showing, and then turn the 4 ways on? I believe you will have “4 ways” flashing out back, but nothing showing up front until either key or park is turned on.

That is the situation I used the diodes to rectify…and would be a common issue if one was broken down at the side of the road…all you would likely want is 4 ways. ??