• How to install the unit refer to: https://youtu.be/6ekQ9duXwB8
• To make connections to the head unit, just match connectors and/or labels. If on-screen AC control is not working, check if 8 pin connector with green and green/black or white and white/black wires is connected to the back of the unit.
• The factory AC box need to be retained when install the unit, keep the 2 connectors connected to the factory how they were originally with the box inside (usually the AC box connectors have yellow tapes around the harnesses).
• Please connect the correct connectors according to car's model year, wether your car has oem nav,  or backup camera.
• For OEM camera to work, make sure you connect the correct connector(s) and RCA according to the OEM model year and whether has OEM navigation. The correct male yellow RCA needs to connect to female RCA labeled CAMERA or CCD Video in.
• If the airbag on OEM combination meter/gauge cluster is on after installation, please make sure the two pin connector in above picture is connect to the vehicle. Then follow this video to get rid of the airbag light: https://youtu.be/2QdDkETj0S8
• The sim card can be put into the back of the unit and also the sim card cable we provide. T-mobile SIM card would be better to work in our unit.