Jetboy
New member
I finally got my order of plugs. Took about 6 weeks or whatever to ship from China. They got stuck in customs for a long time. I suspect trade/covid issues are causing major delays in most imports. I'll try to give this a try with the resistors when I have some time (that's the biggest issue I have right now - time with no childcare I'm either working or childcare 7 days a week - and we're so the time to do this stuff is really limited until something changes with the covid situation). I'll probably just run the wiring into the cab and then mock up different options with a breadboard and see what happens.
I don't think there's another way to trick the ECU into not putting on the dash light, and I don't think it resets without turning on/off the ignition. I think it sets the code and leaves it on until it restarts the KDSS ecu. But Toyota locks down the code and I'm certainly not enough of a software hacker to crack Toyota's encryption. The only solution I can think of that I'd try is to use the relay to trigger a time delay secondary relay that would then open the circuit to the KDSS ECU for maybe 5 seconds. Since it's an add-on ECU it would restart separately and probably clear the code.
However - with that, I don't know if the temporary disconnect of the KDSS ECU would signal to the CAN bus to set some other code in another place. Just something that would have to try. You wouldn't need to do that at the KDSS ECU. It could be done at the fuse I think. So I'd probably just make up a circuit at tap in using what's called a fuse socket connector. Allows you to easily access a fused circuit in a plug and play type way and disconnect with your aftermarket circuit. A fuse tap can function for this and if it were wired up the right way it could serve both functions of powering the relays for the disconnect and cutting out the KDSS ECU to reset when turned back on.
They look like this - I don't see them used much, but they're handy for some situations like this or when you need to measure current to diagnose something:
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