Delete Auto Stop/Start on 2025 (Not the temporary button)

[penright]

I was not thinking, BCM is probably checking the hood latch constantly for theft protection. I bet the code gets set unplugging it. That the pass/fail i thought it was me removing the bypass. May have to rethink the issue. Now I am more than ever curious what is under the heat shrink.

 

[penright]

It is wired how I would expect, except for the missing diode. The resistor measured about 2.4K

 

[PoManNox]

No light, i just saw the code when I connect the scan tool.

It's possible these harnesses throw the same or similar codes on my 2021 Equinox and Traverse. I only own an old $30 code reader which shows no present codes, but that may be because its not capable of reading those code families.

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.

 

[penright]

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.

 

[2025blackout]

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.




Me too, I hope I can get there.

Looking forward to your progress. This is one of the first things I want to disable. I try explaining to my daughter I'd prefer she disable it when she drives it, but typical teenager it goes in one ear and out the other.

 

[penright]

I will mess with it more tomorrow,

Well, I did not mess with it. Just took a day off from everything. I did resurrect an old laptop to connect to my Hantek 8ch scope.

Looking forward to your progress.

I saw in another post you DYI wrench and have a friend who is a service writer. Do you think he could get us the schematic and/or theory of operations for the hood ajar? As you can see I have one for the 2024 and the bypass I bought should have worked. I am trying to find out what they changed in 2025 around the hood ajar. It would be nice to know definitively how it works.

 

[2025blackout]

Well, I did not mess with it. Just took a day off from everything. I did resurrect an old laptop to connect to my Hantek 8ch scope.



I saw in another post you DYI wrench and have a friend who is a service writer. Do you think he could get us the schematic and/or theory of operations for the hood ajar? As you can see I have one for the 2024 and the bypass I bought should have worked. I am trying to find out what they changed in 2025 around the hood ajar. It would be nice to know definitively how it works.

I'll certainly see if I can get that info!