After I had the 12V Gel Cell battery replaced on my 2007 TCH, I can no longer use my Navigation system OR any steering wheel controls or anything on the display such as hybrid information. I am hearing this is a common thing BUT still have not come up with the solution. I am not sure I want to take it to Toyota. Does anyone have any information that can help me?? I am going to call regional Toyota today. The shop that replaced my battery can't figure it out either. Thanks!!