Help Troubleshoot Mercedes Temic Window Board!

[Joe Exclamation]

Hi guys, I'm having trouble with the window system in a Mercedes car. All of the windows and electric mirrors work apart from the driver's side window. So I replaced the motor, but as soon as the driver's side motor is plugged in, the whole system shutsdown. I figured this was a fault in the driver's side window board, which gives power to the other window PCBs. The only fault I can find is that only 10.4v are getting to the driver's side motor connector, when to the other ones I'm reading 11.4v. There is also a dead rail in the middle of the section, looking like it's being pulled low by the MCU. Any ideas?

https://imgur.com/I0jCBaG

 

[ahsrabrifat]

It sounds like a short circuit. Measure voltage at the power input to the window PCB under load. If it drops significantly when the motor is connected, suspect a short or overload.