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Just recently got an Atoto S8 Gen 2 to put in my X. I have the touchscreen nav OEM stereo so I wanted to clear up some misconceptions I've seen on forums and Crutchfield for the Atoto install for THIS specific OEM stereo.
1. You don't need the bluetooth bypass module that Crutchfield says you need. That is only for the non-nav stereo. On the nav unit Bluetooth is built into the head unit.
2. You can use the Metra 70-7552 or 70-7553 harness. I used a revised 7552 with the Scosche SLC4 line out converter. The 7553 with RCA connections to Atoto preamp out will work, but I wanted the ability to fine tune the gain. With the preamp outs you are stuck and I don't believe the amp output from the Atoto exactly matches the OEM unit. I also could not find a revised version of the 7553 with the SWC wires built in (See #3).
3. The revised 7552 harness that includes the SWC wires (2 keys plus ground):
You can use the Metra 7552 but you'll need to tap the OEM harness directly since the Metra harness does not have these wires (or install extra pins).
4. You don't need the Axxess SWC module. The OEM stereo uses the 2-wire SWC key setup the Atoto is looking for. Get the revised harness from #3 and wire directly to the Atoto. I fed all the ground wires (unit and harnesses) to one ground point behind the radio.
Hopefully this will save some people some time/money. I went through a few different harnesses not knowing that most people have the non-nav RF Stereo but assume its the same connections as the nav unit (as Crutchfield does).
1. You don't need the bluetooth bypass module that Crutchfield says you need. That is only for the non-nav stereo. On the nav unit Bluetooth is built into the head unit.
2. You can use the Metra 70-7552 or 70-7553 harness. I used a revised 7552 with the Scosche SLC4 line out converter. The 7553 with RCA connections to Atoto preamp out will work, but I wanted the ability to fine tune the gain. With the preamp outs you are stuck and I don't believe the amp output from the Atoto exactly matches the OEM unit. I also could not find a revised version of the 7553 with the SWC wires built in (See #3).
3. The revised 7552 harness that includes the SWC wires (2 keys plus ground):

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4. You don't need the Axxess SWC module. The OEM stereo uses the 2-wire SWC key setup the Atoto is looking for. Get the revised harness from #3 and wire directly to the Atoto. I fed all the ground wires (unit and harnesses) to one ground point behind the radio.
Hopefully this will save some people some time/money. I went through a few different harnesses not knowing that most people have the non-nav RF Stereo but assume its the same connections as the nav unit (as Crutchfield does).