July 1: So it begins. Don't worry, this is not in the correct legal jurisdiction!

Trailer Tow Module Connector End View (C2)

WARNING: This page is about a different car, the 2006 Jeep Commander. However, it is still accessible from the selected car via links, so may be relevant.

MODULE-TRAILER TOW C2 - 4 WAY

Courtesy of DAIMLERCHRYSLER CORP.
CAV	CIRCUIT	FUNCTION
1	A922 16RD	FUSED B(+)
2	-	-
3	Z923 14BK	GROUND
4	A907 14RD/DB	FUSED B(+)