HB Common Door courtesy switch signal?

[Yaross]

Good day Sirs!

I am installing a car alarm on my Yaris 2006, 5 door (HB) and it requires a single (-) negative signal whenever a door is opened.

My problem is this, the rear door (hatch) and main cabin has separate lamps that work independently whenever the hatch or a door is opened. I need only one signal and I am afraid that that if join the signal from the rear hatch to he rest of the doors, I will lose the independent function.

I also noticed from the dashboard that if any door is opened, including the rear hatch, the red car icon (symbol for open door) lights up. This means it is receiving all the door courtesy switch signal. In case I want to use the signal from that, can somebody tell me where to find the line so I can tap the car alarm door switch wire on that.

Thank you all and I hope you can help me.