Pulled the wire, installed the camera and harness, and spliced wiring yesterday. No display when I put the car in reverse, so started troubleshooting today.
A few notes:
1) 2014 FR-S, factory Pioneer head unit
2) Used this camera:
[ame="http://www.amazon.com/gp/product/B00VUSVM8U?psc=1&redirect=true&ref_=oh_aui_detailp age_o03_s00"]Amazon.com : SallyBest® Waterproof Night Vision High Definition 420TVL Car Rear View Camera Universal Auto Parking Reverse Vehicle Backup Camera with 170 Degree Viewing Angle : Car Electronics[/ame]
3) Adapter harness is this one:
http://www.autoharnesshouse.com/19867.html
4) Trigger wire (also from autoharnesshouse) is run from the pink wire in the driver's side foot well (verified it to only be powered when the car is on and in reverse) to the correct slot on the 28 pin connector on the factory harness.
5) The lead wire from the harness is connected to wiring ran back to the camera.
6) Camera is grounded properly (removed nut from one of the trunk lid bolts and inserted connector/ground wire, reinstalled nut).
7) Composite cable ran from camera back to harness behind head unit.
Used a test light to ensure I had power all the way back to the camera when car is on in and reverse (checked good). Verified there was no power when car was in park (checked good). Used a TV as a monitor to ensure camera was working and full length of composite cable good (daisy chained some cables off the composite cable in the dash from the camera out to a TV). The camera was powered by the car on and in reverse, TV plugged into garage outlet, got image and guidelines from the camera to display on the TV without issue.
It's only when I plug the composite cable into the harness from autoharnesshouse that I get nothing on the head unit. Everything else on the head unit seems to be working fine. Display doesn't flicker or show any signs of the camera being connected. I'm drawing a blank and not sure what else to check (other than pull the harness back out and check it, but if I have to pull it out and find an issue, just going to return it, not fixing someone else's work). I went through the settings on the head unit, switched one setting (something like "display image" to "On" and also switched vehicle type to "FR-S", was showing up as "tC" I believe.
I contacted autoharnesshouse to ask for ideas and they asked if I had the camera powered by the reverse lights (No) or the lead wire from harness (Yes), so the install is correct there. Also said that the reverse wire pin might not be making good contact to the head unit. This was true at first, but I had already found and corrected the issue earlier today found during my troubleshooting. I used some needle nose to grip and insert the pin a bit further. It is holding tight now and since the camera is getting power just fine (as verified by connecting the TV), I don't see this as the issue.
Also, attaching a basic diagram of my installation. Hopefully it's not too basic and makes sense. Also, the diagram doesn't show it, but the harness is grounded as well using factory ground location behind head unit.
Any ideas?