[COBlue]

After going through the very cumbersome process of modifying the Maestro RR TO1 (previously recommended) harness for my 2017 BRZ, iDatalink advised this MY and later are "more Subaru" and they are moving to the SU2 harness instead.

SO IF YOU ARE BUYING A MAESTRO RR FOR YOUR 2017+ BRZ, GET THE SU2 HARNESS

Much simpler installation (backup camera works with no modification) but not perfect. Notes so far (this is with a Pioneer AVH-2440NEX HU):

1) Flash the RR with the 2017 WRX no HK amp firmware (steering control layout is slightly different, but available buttons on BRZ worked fine for me).

2) The RR runs a brown/red CAN1H wire to pin 9 of the 28 pin harness. On the BRZ that pin is Amp Signal +12v (iDatalink says this is unique). I clipped the brown/red wire near the 18 pin RR harness and then it was the perfect length to twist together with the blue (antenna power/amp) and blue/white (radio amp signal) wires coming out of the RR. Then soldered those to the blue/white remote trigger wire coming out of the radio. With that it is providing amp and antenna power from the HU remote signal wire.

3) The track pack was not working with the BRZ firmware + TO1 harness, but is working with the WRX/SU2 combination.

4) TMPS data is not being displayed from the OBD now, waiting to hear back from iDatalink on that. (It was working with BRZ/TO1 combo.)

5) iDatalink recommended connecting the HU parking brake wire to the RR parking brake wire even though that does not go to pin 15 on the 28 pin harness which is brake on the BRZ. This did not work. Waiting to hear from iDatalink if they think firmware will fix this or if I should try running the HU brake wire directly to pin 15 (this worked on the TO1 harness).

6) The TO1 harness was drawing some power through the power antenna amp wire even with the car off. iDatalink says this is not an issue with the SU2 and connecting directly to the HU remote signal wire (makes sense). I will measure voltage the next couple days to be sure it's not drawing power.

7) On both firmware/harness combinations only certain data is available to be displayed in certain gauge positions (e.g. top left only offers MPH and 0-60). iDatalink was surprised/confused by this. I'm waiting on a solution for that since the WRZ/SU2 change did not affect that.