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Old 01-27-2013, 03:01 PM   #325
Scooby Specialist
Member#: 25837
Join Date: Oct 2002
Chapter/Region: South East
Location: Atlanta, GA
1996 SVX L AWD
Laguna Blue Pearl


Originally Posted by theoutbackdream View Post
Do the 08 2.5is have similar connection diagram as the 2012 wrx?
2012-up Imprezas (not WRX or STI) with a non-nav factory head unit still use the same 20-pin harness for power/speakers/SWCs/etc. as previous years. Crosstrek also. There are a couple of minor differences (which mostly don't matter when installing an aftermarket HU):

* The new Imprezas and Crosstreks dropped the CAN data bus. That only matters if you're trying to transplant OEM HUs across different models/years.

* The new Imprezas and Crosstreks now have a pin for the illumination "bright" mode (night illumination dimness cancellation - 'NIDC'). Pin 11 (formerly one of the CAN pins).

* The new Imprezas and Crosstreks have Vehicle Speed Signal (VSS) on pin 19. That is used for the speed-sensitive volume feature on the OEM HU (as well as locking out functions while you're moving). A few aftermarket navigation HUs can use that signal to improve position tracking. I can include an extra wire for VSS on my harness if you request it.

2011-2013 WRX and STI, and 2011 Impreza/OBS are all still the same (they have CAN bus, and no pins for VSS or bright mode -- they use CAN bus for the speed volume and NIDC features).
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