Back side of LCD after installed to dash kit.
Circuit and schematic for Acc delay module.
The momentary hold relay board and the acc delay module are a couple things I engineered. The momentary hold relay board is to power on the gps unit and the tablet, it replaces the need for you to push a button. The acc delay module is for my older amp. It delays the power on of the amp and crossover to eliminate any feedback or sub thump until the tablet is powered up.
Here is my parts list:
Amp- Old 4 channel I had laying around, A 5 channel is preferred but you can make a 4 channel work with a crossover for the sub.
Tablet- I went with a 7" Chinese tablet from Top Notch tablets. Cortex A9 duel core 1.2 ghz processor. 512 mb of ram. Android 2.2 system. Bluetooth,gps (didnt work), wifi, 32 gb storage and multipoint 800x480 touchscreen.
Charger-Used for tablet battery and gps unit. 2 amp (5volt) usb charger from Walmart I integrated to always be charging when car is on only.
Cables- I had some issues with "ground noise" from the usb charger. I ended up solving this issue by buying Kensington Noise Reducing Car Audio AUX Cable for MP3 or SmartPhone, including iPhone 4S. I hooked this up with Cables To Go - 03170 - 3.5mm Stereo Coupler F/F, 2 of Tsunami RCA701-Y1 RCA 1/Female to 2/Male Y Connector Cable (6 Inch, Gray),Mediabridge - 3.5mm Male To (2) RCA Stereo Audio Cable [New design accomodates smartphone / mp3 cases] - (6 Feet). All great quality and cheap from Amazon.com
Chime module- Since I took out the stock head unit and that contains the annoying key reminder, turn signal tone and headlight dinger I had to replace that. I bought a non Onstar module since I do not use Onstar nor XM and it was 1/2 the price. Pac C2R-GM11 11-Bit Interface Radio Integration Adapter for 2007 GM Vehicles with No Onstar System. I used 3 of the wires on this unit. The black ground wire, red RAP acc wire and blue/white amp remote wire. I tied the remote wire and RAP wire together so it will turn on the amp when the tablet is on. Also the RAP wire and ground hook to the 5volt usb charger.
Car kit- Chevy/Pontiac/Saturn Double DIN Install Kit off, also off Amazon.
Bluetooth GPS- As I mentioned before the internal tablet gps didn't work. Instead of using a weak stock gps unit I decided to get a TomTom MKII Bluetooth GPS Receiver off ebay. It was like $12, couldn't go wrong.
OBD2 Interface- I used PLX Kiwi Bluetooth OBD2 SCANNER GAUGE Diagnostic Droid, for my phone before I built this. I thought I'd add it in here since its being used.