2020 Kia E-Niro VESS/Reverse Chime defeat solution

Hey all! I just wired up the VESS momentary switch to my 2022 Niro EV EX and it works well. Thanks for all the info and the videos.

I'd like to have it off by default. I was thinking I could wire up a simple transistor + cap for a delayed circuit. To do that I need some constant voltage.

Had trouble reading the schematic. Would the brown wire give a constant voltage supply? And, what voltage? (I could check the voltage eventually when I crack it open again..)

I experimented with the switch: if I hold it down while the vehicle is turned on (circuit closed), VESS is enabled. If I let go of the momentary switch, it will disable.

So, I could have a transistor that is normally closed allow the circuit to start up closed for VESS, then when the capacitor accumulates enough, open the transistor for the duration of vehicle operation. This could be tapped alongside the switch. That way it would turn off VESS about 500ms after I turn on the car, but the switch would still operate normally.

Thoughts? Thanks for any info on a voltage line if you have it!

 

Sorry, I was referring to Pin 1 or Pin 8. Attaching image you posted long ago.

And I agree re: momentary switch. Seems like there's a latch circuit detecting change in signal voltage to toggle VESS. So my thinking was to have a delay circuit do that for me. Only thing holding back that idea is the need for a separate voltage line, since I cannot control the signal voltage without it.

 

Seems like it says "IBPM" or "IGPM"? Not sure what those mean. If there's perhaps another steady supply of voltage, that could work. I really don't want to resort to a 9V battery...

 

@ENirogus I did the switch on my 2021 Kia Niro with success, but recently got a 2024 Kia EV6 GT-line and want to do the same switch. Do you know if all the steps are the same?

 

I have a microcontroller do exactly what you're wanting, by waiting x seconds before turning off VESS. I also have a latching switch to let the microcontroller know that I want the VESS in a certain mode. I use the brown wire for 12V power which turns on when the car starts.

 

Sorry, I was just trying to answer your questions about the brown wire (P1).

I use a Raspberry Pi Pico microcontroller, a 16mm latching switch with RBG LEDs, and additional circuitry. Obviously, you could do a lot with the microcontroller, especially if you wired in a reverse indicator. But since I installed it 3+ years ago, all it does is match the switch on/off position to the VESS on/off, with some feedback via LEDs. That way it 'remembers' the mode from the last time you drove.

I had plans 3 years ago to put all the circuitry on a single PC board and market it. I even ordered all the components, but got busy and did not complete the PCB layout. I had since forgotten that I had gotten that far until I looked yesterday. I am going to finish the design and order a prototype PCB soon, even if its just to replace my hacked-up breadboard under my dash.

I also took apart the dash switch assembly to see about using the unused switch position. Designing a different PCB to place inside the US button panel would be doable, but the blank button plastic is different from the switches so that it cannot move. It would require modifications to the button housing and a new button (3D printed?) that has a light-pipe to show the status LED. The only way to accomplish this would be a core-return policy.

 

If you simply cut the blue wire would this turn off VESS all the time forever? Or what about adding a resistor to reduce the current so it wouldn't be so loud?

 

I was suggesting to take the sound unit apart and adding the resistor to a speaker terminal.

Also, the question was if I cut the blue wire would that specifically deactivate the VESS and nothing else. I wasn't saying that everyone would want to do this, I was asking if that would just disable it completely (which is what I'd like to do). After reading the relevant threads, I didn't see that information.