Right rear door ajar always on

Sorry for the delay.

I am attaching the wiring diagram and it appears the left rear door has a blue and black wire so let's just make sure we are on the correct pin which is A2 of the C6 BCM connector for the RR door.

https://www.2carpros.com/articles/how-to-check-wiring

If you are on the correct wire, then the color is not that important but yes. If you ground this wire, the light should turn off. So, the way to repair this is to run a new wire to the switch and ground if the light turns off if grounding the wire.

If it does not, then there is a chance that the wiring has been tampered with. However, if it has not then the BCM is the issue because there is a resistor inside the BCM that is most likely an open circuit.

I am attaching the wiring diagram below that shows this.

Let me know what questions you have.

No problem. I am attaching all the connectors for the BCM because while you need C6 someone else may need one of the others.

The last two attachments are C6. Let me know if you have other questions.

Thanks

You are welcome. Keep us updated on what happens with this. I suspect you're on the right path because if you ground that circuit and the light goes out then you have a wiring issue. However, I am hoping this proves out.

Thanks