Need help here. My driver's side door ajar sensor isn't working.

I've tried troubleshooting the problem, all the power windows, central locking and speakers are all working, I get a power reading of 12V and 9V for my courtesy light.

For all the other doors, the interior lights turn on when open and the door ajars are working when I press them.

The driver's door ajar, however, isn't registered by the car that it's open. I don't see the red line/light for the drivers door on the dashboard when it's open. Light's won't turn on either.

I've checked the connection from the inside, and it's secure, not sure what/where the problem is. I have a feeling it may be the Body Control Module (BCM). But I am not sure where it is and which wires/pins to look at.

Could also possibly be the wiring, I am not sure how to take out the drivers door panel, so any tips or advance on how to would be much welcomed as I don't want to pull too hard and break something or wrap the plastic.

Any help or advise would be much appreciated. Thanks in advance!!

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