My Sister is having an Honda CRV 2011 model with almost 6000 mi on it. Recently we went for a vacation for 3 days on a rental car and somehow the inside lights which works while you open or close the door remained opened the Honda. So when we came back and found that the battery was dead. So what we did that expense a jumper cable and make the car start by hooking one end on the battery of the running car and the other to the said car. The car did started and working fine but since that incident the CD player display is showing a message "ENTER CODE" we tried different buttons randomly which is now showing message "ERROR CODE 7". Its not playing radio or CD at this point. So before taking any further actions I like you to take your suggession before taking any further action.