For 7.1 Android OS Unit
try to set to 19200 and 38400 with the Protocol XinFeiYang
For 4.4 Android OS Unit
Settings, System Vers/Info, Press and Hold middle of screen - Keypad will come up - 7890 ok,
System, can scroll down to the setting below.
After set to XFY, 38400, 38400 need to restart by pressing the RST button with paper clip near the mic.
or turn off car, open close door, turn car back on
Example of AC control of Car Dash
For 7.1 Unit
check settings
advanced (8861)
car type
Old F150 Lo (For Manual AC)
Old F150 Hi (For Auto AC)
press one of those 2 car types
Then on the next page, check that
Protocol is - Xinfeiyang
check mark the box at the top right of the picture
press ok
then restart the unit
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If AC Controls has
Temperature Control and On and Off Control
Try Re connecting OEM unit - Set the Air conditioning Fan to Low
Re Plug our unit then see if AC controls works