The 2009 Hyundai Genesis has a combo CD player / stereo / Navigation / car information system. It has an LCD panel that displays information from this system but I'd like to get it working with a different display.
I found a pinout for the connector (see below – top row), and it has Tx0-/+, Tx1-/+, Tx2-/+, TxCLK-/+…. and then one labeled GND and one labeled Data.
With three TX pairs and a TxClk pair this sure looks like HDMI to me.
And I tested the one labeled GND and it is, in fact, connected to the metal casing for the unit. But what about the one just labeled data?
I watched HDMI 2.1 & TMDS Crash Course and while this is a proprietary connection I think it's possible that the additional wire would be one that is part of the HDMI spec. According to the video, the TX0,1,2 and CLK pins are required but an HDMI cable could have some optional ones including DDC/I2C, HEC (ethernet), ARC (audio return), or CEC/hotplug ( see diagram from video below).
There's no reason for this to have Ethernet or Audio Return. I think I2C needs two wires, not "one wire and a ground". And there isn't a 5V source in the cable so I don't see how it could be the hotplug detect wire. I'm stumped.
What would the Pin #5 "Data" wire be?
Best Answer
It's highly unlikely to be HDMI.
Much more likely is that it is raw LVDS - which is very common with laptop displays and flat panels in general. If you know what the pixel resolution of the display is, you could try an HDMI/DVI/VGA to LVDS converter as you might use for converting a laptop panel.
While it is possible that it could be something like eDisplayPort, I doubt it.