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Forcing Accessory-Mode in Vehicle after stopping the engine

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Sebastian S.:

--- Quote from: viperidae on January 20, 2019, 05:07:30 am ---If I were you I'd do a proof of concept first.
The last thing you want is to spend a whole bunch of time designing and building something to find out you can do it.

It's possible the ECU will detect the ACC line still active after turning it off and throw a fault code, switching on the check engine light.

--- End quote ---

That's the goal. Investing in a few bucks to try this out is ok for me. After the chip is programmed everything will be tested on a breadboard with a LED as indicator of power running. Since I need 12V to programm the chip I got now (but is missing in tinyCAD) it's perfect to check everything.

I will check for actual dark current one the contraption is in place
I will check for fault codes a few times after to be sure and if any are placed if they're critical.

I'm not sure if I should add a resistor into the circuit for the door signal since the switch itself doesn't provide one. I'd be checking just for a closed loop at this point with no way of telling if the contact is shortet to ground or not.

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