I learned about Car Audio Engineers while having our car wrapped by Sacramento's leading XPEL installer.
We had Jon install our dual channel dash cam and some footwell lights into our new 2021 Kia Telluride and 2021 Kia K5. This was supposed to be a simple install and quoted us 2.5 hours for each car.
TLDR: Jon knows his electronics and how to get to all parts of a cars electronics. He's able to troubleshoot electronics and is an expert with his scope meter. His paid for techicnal resources for car schematics, wire harnesses, etc, didn't even have appropriate notes for Kia's odd electronics.
The short version:
He took great care of our Telluride and K5 and was careful around our new cars. Jon knows his stuff. He showed us some work on another customers car where he was custom fabricating parts for older cars and retrofitting them with better audio systems. Among his other tools, he has a plastic laser cutter and a 3D printer.
Jon had the blackvue dashcams (front and rear) and footwell lights installed in no time for both cars. The blackvue knows when the car is on or off and acts accordingly.
I wanted to use an Arduino system I built to control the footwell lights (and other stuff) and needed 2 inputs to trigger the footwell lights: when the headlights are on or when the dome lights are on. My arduino would turn on the footwell lights if either of those 2 were on. Jon had no problem providing these inputs, along with if the ignition was on.
However, Kia has some complex wiring for the dome light trigger for the footwell lights. It turns out there's actually 2 wires that control when the dome lights are on, and each dome light has a computer that decodes the signal. In the end, it took about 12 hours over a couple days to trace all this out. He still only charged us 2.5 hrs per the quote, however, we insisted he charge us a little more.
Long version:
The Kia uses a 0 volt trigger to tell the dome lights on, and goes to around 11 volts for the Telluride or 3.52 volts for the K5 to tell the dome lights to turn off. No problem, I can handle this in software and simply reverse the logic.
That works great if you close the door, the dome lights turn off after a bit of time. Then, you lock the door, the, the dome lights stay off, but the new footwell lights kept turning on.
After pulling a couple of dome lights and using his scope meter, each dome light actually has 3 wires:
1) trigger wire
2) accessory power wire
3) ground/neg wire
Each dome light is responsible for decoding this to determine when the light should actually be on.
It turns out, when you lock either Kia, the car raises the trigger voltage but turns off the accessory wire. This keeps the dome light off but my Arduino kept seeing a high voltage for the trigger.
In the end, Jon had to run another wire to my arduino so I can know if the accessory power was enabled. Everything works great.
I would not hesitate one second to have Car Audio Engineers work on our new cars again and will recommend them to all our friends. read more