I share in this thread, my experience of mounting a 2012 Nexus 7 in my 2008 Toyota avensis.
The biggest problem was about :
- Power : a Nexus 7 tablet will not boot, or behave strangely if battery is over discharged. This is a real problem because you have to take care of battery deep-sleep when not in car, remove battery heater apps that will prevent to sleep (frequent with GPS apps). To resume, having a battery in the Nexus 7 in car install raise a lot of complication.
- Risk and security to have an Li-ion battery in the top of my dashboard (danger with high temp and direct sun exposition) : Even in north of France, direct sunlight can raise very very high temperature at the top of the dash. So i was very worried to have a lithium battery. For my safety. I was afraid to find my car burned. It can arrive. I think it's really not a good thing when i see other in-dash mount that keep battery inside the nexus.
So, i decided to remove completely the Li-Ion Battery, and power the tablet directly from a 12V->3.7V DC converter, connected to my cigarette lighter.
Everythink work perfectly now. The only two small side-effect are :
- Car ignition will shut off power 2 ou 3 second, and tablet will reboot.
- 40 seconds boot time. It could be long, but i am rarely in my car for less than 2 minutes. So it's really not a problem. My Tom Tom GPS sometime take 30 seconds to be ok.
Total cost for this project are
- 15 dollar for 12V->3.7V converter on ebay
- 130 dollar for a 16G Nexus 7 on ebay
- 120 dollar for a genuine toyota navigation dash mount extracted from an broken avensis that had toyota GPS.
- Some dollar for adhesive, cigarette lighter plug, etc...
Here is some photo. I will add photo from inside if someone is interested (maybe not for a Toyota).
The main interest is to share for my Power problems
(sorry for my french-english)
My avensis before nexus 7 install
ebay - 12V to 3.7V DC Converter
ebay - Genuine Toyota GPS dash part