Easily solve if you get an exclamation mark when start Joying head unit

Problems from Joying customers:

1. The screen only shows an exclamation mark
in a yellow diamond whenever it's plugged in.  I spent hours trying to fix
it, but the radio plug appears to have a missing part to it, and the
exclamation mark won't go away even after multiple tries of reboots and
resets.

2. When I put my car in reverse there is an exclamation point instead of the image.  Can you help?

Analysis of causes: Connection error

As the images above, when the "back" wire was applied to the power, you can see an exclamation point in screen, and it will be normal when you disconnect power.

Solution:

1. The "BACK" wire is used for connecting triggering wire of backup camera. 

     

More detailed info, please read this blog:  https://www.carjoying.com/Joying-blog/7.html

2. If your car has can-bus system, please disconnect the "BACK" wire.

Because the can-bus will decode the reversing image to Joying head unit. (You need to buy a proper can-bus decoder for your car)

Please find the "BACK" wire in the harness, it is an Orange wire. (Not orange+white or orange+black)

Please the "BACK" wire

Focus more on our site:

http://forum.carjoying.com/
https://www.youtube.com/c/BoykaJoying
https://www.carjoying.com/
https://www.carjoying.de/
https://www.carjoying.co.uk/