Embedded Files
General hardware installation
General hardware installation
Mine came with all adapters for gen3 Prius from AliExpress seller. Plug and play.
It didn't come with mounting brackets into existing HU chassis mount location. I used metal pipe hanging straps cut to length and bent to shape for mounting and 4 holes on HU side to mount. Needed to use very shallow bolts (ones from my original HU was deep enough to contact capacitor and cellular antenna post, use washers to reduce depth). See here:
https://xdaforums.com/t/ac8259-cpu-based-hu-problems-questions-mainly-yt5760.4171219/post-86152977
https://xdaforums.com/t/ac8259-cpu-based-hu-problems-questions-mainly-yt5760.4171219/post-88715831
Rear connections
Rear connections
On some HUs like 1 DIN 7" screen HUs the connections are inside the HU.
Browse between all pictures to see how each pin is assigned:
Note: You can also take a look at this info in "Car Settings" app.
Source: https://xdaforums.com/t/ac8259-cpu-based-hu-problems-questions-mainly-yt5760.4171219/post-87654963
ISO connector
ISO connector
For some cars battery+ and ignition wires need to be changed at ISO connector for third party radios. So check for your exact model how the pins at ISO connector are assigned at your car and compare it with your new radios ISO pins.
Source: https://xdaforums.com/t/ac8259-cpu-based-hu-problems-questions-mainly-yt5760.4171219/post-89683484
Steering wheel controls and CANBUS installation
Steering wheel controls and CANBUS installation
Generally, there are 2 options:
Without CANBUS
Without CANBUS
If original car radio doesn't have CANBUS interface, then steering wheel controls is through the KEY-1 and KEY-2 signals on the main power connector to this HU.
Without CANBUS box, other car data is not available. For example, steering wheel angle (to curve the backup camera guide lines). Climate control info and others.
See also here:
https://android-headunits.com/what-are-key1-key2-and-gnd-for-android-headunit/
https://android-headunits.com/can-bus-box-wiring-guide/
https://xdaforums.com/t/ac8259-cpu-based-hu-problems-questions-mainly-yt5760.4171219/post-86808213
https://xdaforums.com/t/ac8259-cpu-based-hu-problems-questions-mainly-yt5760.4171219/post-86806127
With CANBUS
With CANBUS
Some original radios include CANBUS interface signals. This requires having a CANBUS decoder and the matching main wiring harness to connect to this HU (HU does not have CANBUS decoder built-in).
https://xdaforums.com/t/ac8259-cpu-based-hu-problems-questions-mainly-yt5760.4171219/post-86813775
Rear camera installation
Rear camera installation
Typical installation is as follows:
Camera usually powered by backup light. Connect to backup light power source.
Video cable include additional internal line indicating backup camera is powered on (that's why video cable has red wire connection on each end). One end connects to the backup light power (to signal backup camera is being powered on). The other end connect to HU's cable for detecting backup signal. See this video for reference:
connect Reversing back up camera on Joying android 5.1.1 lollipop car head unit radio - YouTube
Here is also a guide how to connect rear camera:
https://android-headunits.com/connecting-a-reversing-camera-to-an-android-headunit/
You need to set the video camera format correctly in "Car Settings" -> "Factory Settings" -> "Reversing camera settings". Also see how to enter various menus on the HU below:
https://xdaforums.com/t/ac8259-cpu-based-hu-problems-questions-mainly-yt5760.4171219/post-86222561
Setting up illumination (automatic dimming of screen)
Setting up illumination (automatic dimming of screen)
If you want automatic dim screen for example when you turn on headlights, you need to connect the ILL (illumination) wire from the HU. If it's not at the main connector, look at the ISO connectors, take a look at the 16pin connector at rear connections (it is A10) and look at which pin it goes to ISO connectors. Note: The wire color may differ, and therefore the color can be something different than orange! Then take a look at your cars ISO connector and check if it has a wire at this pin. If not, look at the guide here:
https://android-headunits.com/what-is-the-ill-wire-for/
Dimming is reverse when starting car
Dimming is reverse when starting car
In many Chinese HUs automatic dimming has a strange bug. When you start the car, the screen will be dimmed even if headlights are turned off. When you turn on headlights and off again, you'll get full brightness. This happens every time after you turn ignition off and is annoying. A small workaround is described here, but with losing hardware button lights:
https://xdaforums.com/t/yt9216bj-2-32-auto-brightness-bug.4204701/#post-84146367
Motherboard
Motherboard
Major Chips
Major Chips
AP = AC8259SV (can find AC8259E listed on other HU which all claims to be A53*8 2.5GHz)
PowerAmp = ST TDA7850 4x50 MOSFET
AHD/SVM(AVM) = Nextchip N4 (NVP6324) 4 channel AHD Rx
companion STM32F 32b ARM microcontroller system nearby
Power Supply IC = MediaTek 6357MRV
Flash = FORESEE 256Gb
Entire rear chassis is metal with thermal contact points (white thermal paste) to the AP+PowerAmp. So mounting a fan onto rear case is fine.
Source: https://xdaforums.com/t/ac8259-cpu-based-hu-problems-questions-mainly-yt5760.4171219/post-86074435
Removing HU
Removing HU
The most challenging issue is disconnecting the rear cam/WiFi and 2x USB connectors. The connections are so tight and very few wires that its easy to rip out the wires from the female metal connectors. I ripped out both video wires (really thin wires) and pulled out USB wire enough that it no longer made contact. Both was repaired (USB connector pushed back in, video metal connectors removed from plastic connector and resoldered and pushed back in)-
Probably need to use needle nose pliers and a pick to carefully pull out these connectors.
Page updated
Google Sites
Report abuse