I am looking to hardwire in a bluetooth OBD-II scanner into my car (2013 Subaru Impreza WRX) so that I can display gauges on my phone with Torque Pro.
My car has a CAN-H and CAN-L in the radio harness (pin 11 and 12) that was used for the factory navigation unit that I plan to tap by adding the pins to the aftermarket radio harness.
I also bought a donor OBD-II splitter I plan to use to connect the bluetooth dongle to. I am going to cut off the splitter and wire the two CAN bus wires into pins 6 and 14 on the splitter. Power will be accessory power wired through a switch (and fused on a new dedicated circuit).
Do I need the K-line and L-line (pins 7 and 15) for the dongle to work with Torque?
I plan to wire Cgnd (OBD pin 4) to a ground on the dash subframe and Sgnd (OBD pin 5)to the radio harness ground (I figure the OEM headunit grounded through here). Is this OK?