Fresh Air Blower Control Module -J126-, Connector Views

4-PIN CONNECTOR -T4AR- 

Courtesy of AUDI

T4AR (A)	Designation
1	Terminal 31, to 638 Ground Connection (on right A-pillar)
2
3	Terminal 30, from Fuse Carrier 2 ST2 in Fuse Panel C SC
4	LIN-Bus, from A/C Control Head (A/C, Climatronic) E87