"No, it does not. That is the power to the backup lights."
Oh, I thought it was determined that the white with blue stripe wire was for the feed to the backup horn/beeper (stated in the third post).
As for the backup horn/beeper being available in NA as an OEM item......
My owners manual tells about the double shift into "R" will drop the volume, and my beeper has OEM wiring. Running the VIN number at the website that shows the build of the van (
https://carinfo.kiev.ua/cars/vin/mercedes/vin_check ) shows "JW0 - BACKUP WARNING SYSTEM" as a factory installed feature on my VIN. So mine seems to be factory OEM. It was a van built for Freightliner for use in North America. This is listed on the build sheet to verify such: ZU8 - USA COUNTRY VERSION and ZX9 - FREIGHTLINER EXECUTION.
Someone else asked a while back why I had white steel wheels, that those were only on Fedex vans in North America. Yet my build sheet shows RM2 - STEEL WHEELS ARCTIC WHITE as the factory installed wheels.
So it really boils down too.... if you get a van that was built for a particular customer in NA, you might have stuff that doesn't come standard (or isn't even available) when an individual person is buying just one of them. Difference in regular Sales and Fleet Sales