Hi,
Hope someone who understand about wiring can help with this.

Passenger window is not working, when press on both switches (Master switch and passenger door) doesn't work.

Tested motor, and its good. Tried new Master switch and still nothing.

When I prob the wires at Master switch with test light I don't get anything.

From what I can see at with diagram black and grey wire and black and red wire are responsible to roll the window up and down.

And this be a broken wire somewhere?
Is it not odd to be both broken wires?

How can I further test it?