Yep, I exchanged them with new ones.
If I measure at the sensor, I will most likely get a "closed circuit" reading, because I measure through the wear sensor. Therefore I have to measure as far away from the sensors as possible. That's why I'd like to know where the wear sensor control box is located, if there is any on my car.
Without the knowledge were to look, I can only do a visual on the sensors tomorrow.

 

OK, here is the circuit...

Starts at the instrument panel connector On Brake Pad 1, terminal 9 of plug 4 on the instrument panel;
goes to T14, the connector on the inner left fender;
goes to the left front connector, then the sensor, then back to the connector, then back to T14;
Goes to K25 on the Central Electric, then out at M15;
Goes to T15 on the right inner fender;
Goes to the right connector, then the sensor, then back to the connector, then back to T15;
Goes to D15 at the Central Electric, then out at S14;
Goes to T17 in the spare tire compartment, then to the right rear connector, then the sensor, then the connector, then back to T17;
Goes to T16 in the spare tire compartment, then to the left rear connector, then to the sensor, then to the connector, then back to T16;
Goes to terminal 12 in T19, the large harness connector near the Central Electric Panel;
Goes to Brake Pad 2 on terminal 1 of plug 3 on the instrument panel.

That is almost two dozen connections on the circuit!

Have fun...

 

Thanks a lot Wally! That's what I needed. Now I can measure which part of the circuit is open. Today I measured at both front connectors. One measured through, the other one didn't, so I cleaned the connector at the sensor and it measured through. When I drove of...voila!, a nice "Bremsbelaege Service" on the computer. Oh well, time to get diry again.
I didn't realise I was measuring through the rear circuit also, but with your list I'll find it.

Thanks again.