Note: 1. steer wheel key switch is not plug and play, please find a professional to install 2. The cruise control switch requires the support of the cruise control module in the car 3. The function of each side control button requires the support of a car DVD player. Due to insufficient DVD navigation compatibility, some; re buttons may not be able to learn 4. Check if the spiral cable is high configuration, and if it is low set, buy high configuration 5 spiral cable. Control of DISP, trip and other instruments; requires instrumental support; in high configuration, and at the same time, it needs to connect the line to the instrument 6. The order of the lines in roacute; regions may be deforested; and the installation must be adapted based on the old cables in the bundle in the vehicle 7. If you encounter any installation problems during the installation process, please contact us promptly and we will provide professional guidance; Installation information This is a replacement component on the market; but it is not original. Drop Support