It's possible these harnesses throw the same or similar codes on my 2021 Equinox and Traverse.
Hard to tell. Until I can find some manufacturer information, it is all a guess.
Assuming GM did not change its strategy on A/S/S in the 2025 model. A false door ajar (closed) is required for the A/S/S to work. That is a big assumption. Something must have changed in the way signals are created. IE different resistor values and/or different pins. They have 2 signals so cars without A/S/S (KL9 option) for the hood ajar signal. One is to the BCM and the other is to the ECM. It makes sense that functions, like remote start, theft, etc are BCM and the A/S/S is an ECM function. If true that is why modifying the ECM signal only would not interfere with any remote start.
I will mess with it more tomorrow, but my best recollection is the ECM hood ajar was responding to the opening/closing of the hood. If true, I am guessing they swapped the pins. Again, I need to verify those observations. Of the 2 signal lines, the bypass passes pin 2 unmodified. That tells me that whatever signal can change with the hood opening/closing is what the pin (BCM or ECM) is connected to. If the modified signal is wrong, it should stay wrong. Right now that is my working theory and that is subject to change, either from experimentation or someone providing facts about 2025 schematics and/or operating strategies.
All I am concerned with is the MIL is not on, the A/S/S is disabled and everything else functions as it should on the vehicles.
Me too, I hope I can get there.
