OEM unit is 4 inch Screen - Metal Decoder Box is not needed
If OEM unit is 8 inch Screen - Metal Decoder Box is needed
No AC Controls / Not Working
1. Check in
2. Settings -> Advanced (8861)
This Could be wrong setting
8 inch screen uses ATS -L H
4 inch screen uses ATS -L L
CarTypeSel:
After choosing car type reset the unit by pressing RST with a paper clip or Turn off car Wait 10 seconds then turn on the car.
AC Controls Setup