Originally Posted by Akatc
Whats the difference between 2010 and the 2011 wrx that would make this not work with it? I have the 2011wrx and this is exactly what I want.
In cars with the phone/Bluetooth buttons on the steering wheel, the factory 20-pin harness has 3 pins for the steering wheel controls (pins 4, 13, and 14). Models without the BT buttons only use 2 pins (4 and 14). The two styles (BT vs. no-BT) also use completely different resistors inside the SWC pod.
Since Rosen specifically says this unit won't work in 2011-up Impreza or Forester -- "Supports the vehicle’s factory steering wheel controls (excluding Bluetooth controls)
" -- that says they don't have a wire at pin 13. That has been the case with other similar "factory look" Chinese HUs.
Often, those Chinese HUs do have menu functions which allow you to program the function you want each SWC button to do. So in cars with the BT buttons, you could reprogram the HU to recognize the volume +/- and tune up/down buttons to work. But without pin 13, your phone and MODE buttons will be invisible to the HU.
The other big difference in 2011-up models is the harness for the factory 3.5mm aux jack. In 2008-up Impreza & Foresters without BT, the car's aux harness (plugged into the rear of the HU) has an 8-pin plug. Since this Rosen retains the factory aux jack, that means it has the same style of 8-pin socket.
2011-up models with BT switched to a 16-pin aux plug at the back of the HU. So the aux jack in those cars won't work without adapting that connection (either getting a custom 16-to-8 pin adapter from me, or extracting the pins from Rosen's 8-pin socket and sliding them "naked" into the newer car's 16-pin aux harness plug).
@Badtiming: When you have a chance, pull your HU and look at Rosen's harness to check whether it has a wire on Subaru pin 13. Here's my 20-pin pin-out
for reference. I doubt it does, though.
Also look to see if their harness has an additional pin or wire for their SWC input. Those are often labeled "KEY 1" and 2, "AD1" and 2, or something similar. If it has a second wire that you can connect to Subaru's pin 13, and if it has the ability for the user to reprogram the SWCs, then it should be possible to make it work in a 2011-up car.
Incidentally, it could also work in an Impreza or Forester that had the OEM Kenwood Navi HU. You'd need several different harnesses to make that happen (to convert to the older style Subaru 14-pin power/speaker harness, and to the 24-pin harness the Navi uses for the aux input and SWCs).