Directed Directechs DB3 Installation Manual page 10

Additional remote start connections
(Not all of these connections may be required for your installation. Refer to the wiring diagram for vehicle-specific connections.)
Wire
12 Volts
Ground
Hood Pin [1]
Tachometer [2]
10 403.BMW03 2.47.06 2013 BMW X3 (F25) EU
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Connects To
Wire Location
Car Access System under driver dash, 41 pin plug, pin 21
Car Access System under driver dash, 41 pin plug, pin 38
OBD-Data Link Connector, 16 pin plug, pin 9
(+/-) Wire Color
+ red/white (40A)
(chassis ground)
- violet/green
ac black