Okay guys i need help. I have a 2007 tls and I went into work this morning around 9 and everything was fine and today around 8 when i was leaving my car would not even start. Why would this happen?? does anyone know!...Last week Wednesday I did get my sub and amp installed in my car but all week I had no problem, could it be b/c of the system or something else. I don't have a second battery and my system is being powered by just my one battery and this is the same set up I had in my 2002 tls and never had a problem. Could someone please let me know what could of happened? I have to set the code for my radio and for my navigation screen to work again cuz its asking me to put in a code. Can anyone help me.
thanks in advance

 

Defective battery. Replace under warranty. If they give you lip about the stereo then have them test the battery.