Trunk light is likewise connected to the PSE. A37:X1 pin 13. 0.75 mm2 brown/yellow. The switch in the edge of the trunk lid is direct wired to the lamp, and switches between the brown/yellow lead and ground. The PSE connection is how the system knows that the trunk is open, this sends a CAN bus message to the lower field control panel to turn on the LED in the trunk switch.

Just curious, did you confirm fuse #3 in the under seat fuse box? And be sure you have it plugged in correctly, it is very easy to miss the contacts and plug the fuse in wrong so that it is not making contact. BTDT.

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The OM 642/722.9 powered family
Still going strong
2014 ML350 Bluetec (wife's DD)
2013 E350 Bluetec (my DD)

both my kids cars went to junkyard in 2023
2008 ML320 CDI (Older son’s DD) fatal transmission failure, water soaked/fried rear SAM, numerous other issues, just too far gone to save (165k miles)
2008 E320 Bluetec (Younger son's DD) injector failed open and diluted oil with diesel, spun main bearings (240k miles)

1998 E300DT sold to TimFreeh
1987 300TD sold to vstech