This thread and the others like if have been a great help to me upgrading the HU in my 2006 4Runner SR5. Thought I should post what worked for me for the benefit of anyone thinking about upgrading, I didn’t see any details on the T10071 radio in the thread yet. I just upgraded for the 3rd time (!) to a 7” Scion iM T10071 (pt546-00160) radio I got off-of eBay. The long winded path to this point:
Upgrade #1
T10004/T1819 +the cables mentioned in this thread including the microphone and USB cable. I added a USB plug from Mouser Electronics just below the hazard flasher button (can just see it in pic below)
Gained better sound, Bluetooth handsfree/audio streaming, USB, iPod control can play AAC/MP4a natively from USB. Very nice upgrade but decided I wanted to add a backup cam.
Upgrade #2
T10015 (pt546-00140) 6.1” Touchscreen.
Needed +6v camera and 16pin harness adapter for camera (Bought both from eBay from a guy in Portland with instructions, very nice kit - easy) Everything else plug and play, didn't get the nav/entune modules as nav on the phone is way better IMHO.
Gained touchscreen and backup cam but lost ability to play AAC/MP4a natively. Hardest part of camera install was running cable through the rubber boot between body and tailgate, I wrapped camera connector in electrical tape and smeared this with dielectric grease and it slide through easily. Camera trigger needs adding on 28 pin connector when shifting into reverse, I added an ‘anytime’ camera button also to be able to manually turn on camera view. Used a double pole double throw relay for this and a custom button from eBay, found details on how to do this at the link below. If anything it got rid of a switch blank in the centre console and it is cool to show to passengers.
Toyota 4Runner Anytime Backup Camera Mod
Upgrade #3 (Hopefully the last ;-) )
T10071 (pt546-00160) 7” Touchscreen from a 2016 iM.
Needed to replace 16pin connector with 24 pin Pac-Audio CAM-TY12 harness adapter for camera, buy it from eBay/Amazon. Everything else plug and play with the pt546-00140. Only needed to connect +6v and RCA plug from harness, the camera grounds through RCA so didn’t use the black wire.
Gained nicer screen/interface/gracenote/Aha(questionable) and re-gained the ability to play AAC/MP4 via USB. Lost ability to play CDs but not an issue for me.
Latest pic is attached, good luck with your upgrades