Help…tone when disconnecting battery

[Tooth]

I have a 2019 JLU with a 3.6. I’m trying to disconnect the battery to remove the seats to avoid airbag problems. I’ve disconnected all battery terminals yet there is a strange audible steady tone sound coming from somewhere in the engine when I disconnect a certain cable marked in the picture. Any ideas how I can completely disconnect this battery or what this beeping is?

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[Rhinebeck01]

You would not be hearing the tone if 12v was totally killed... You need to disconnect and separate the cables.

Follow these instructions:

 

[Tooth]

Solved. Forgot to separate 1 and 2 from the negative terminal. Thanks!!!! Let me go get more coffee.

 

[58Willys]

So what is causing the tone?

 

[Tooth]

So what is causing the tone?

I don’t know but it was coming from the circled area in the pic. Steady high pitch hum.

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