Many people ask how to build one. Let me tell you it is not very easy.
The device consists of two parts a D2B audio controller and a Raspberry PI which handles the Bluetooth streaming. The latest version of the unit user Raspberry PI Zero – the regular, not WiFi version.
The two boards connect together via 40 pin header. The D2B unit receives audio via I2S protocol from the Rapsberry PI. The two units also communicate via serial interface. The Raspberry PI is powered by the D2B audio unit. The D2B audio unit also can reset the Raspberry PI board if it is not responding to serial commands.
Here is the schematics of the D2B unit. Jaguar D2B board There are two unmarked diodes D201 and D301, part number should be 1N4148WS in SOD-323F package. LEDs are generic type in 0805 package – any color of your choice would work.
The micro-controller is Cypress PSOC4 4100 series. Here is the firmware it is running. You need to use an SWD programmer to load the firmware onto the board. The cheapest one is probably the CY8CKIT-043 kit. The small board with the USB connector can be snapped and used as SWD programmer independently.
The Gerber files that one can use to make the PCB.
This is one of these projects that I never finished. I managed to hook up the Jaguar navigation unit to the Realtek LCD controller board and in turn to an old 14″ laptop screen.
I had to tweak the Realtek firmware a bit to accept the video signal from the nav unit, but you can see it was working fine.
The imaginary goal was to replace the LCD screen in the factory unit with a better resolution screen. However, in the process, I was not able to find anything I liked with a side that would fit the Nav unit and would not require major surgery.
In the end, it was a cool thing to play with, but never saw the light of day. Here are a few more pictures of the Nav UI.
As you can see the 14″ screen does not have the correct aspect ratio – the circle is a bit squished.
Here are a few pictures of a screen I was considering as a replacement of the factory unit, but in the end, it was just a bit too big.
I could not locate any source to purchase the fiber-optic connector used in Jaguar cars, so I 3D printed one.
I managed to find an optical transmitter and receiver pair working at around 650nm wavelength. They were compatible with the signal in the car, so here it is optical connector replacement in all it’s glory.