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As a side note I read a couple of people having issues with this module becoming extremely hot to the point it could burn you. A person reported removing it and going with a different setup like this:
You can replace the factory D1 signal sockets with a D90 2-filament socket and you'll have running lights. When you turn on your "parking lights" or "running lights", your city lights + the signals will light up. I did this to my D1 and is a huge appearance-improvement. You'll have to 'mesh' the 2 wiring harnesses together but it will take you literally 6 minutes flat.
It appears some of the later models need the relay combined with the dealers testbook computer to enable this feature in the trucks computer.
D2 is enabled in the BCU by software. Only '99 NAS D2 came with the needed resistor to have them work, it's a silver box bolted to the header behind the drivers side headlamp.
This should be a plug-n-play, all action takes place under the passenger glovebox.
Hopefully this is the info that will allow you to complete the task.
Some Canadians have reported crazy dealer prices and said they got a $35.00 DTRL kit from Canadian Tires.