Re: power window issue
Guess my comment was poorly worded.......
The question IS: Which switch can fail and cause them BOTH not to work.
Only one will do that, the first one in the series.
From your answer, I think that is the one on the drivers door, right ??
Hmmmm.......now that I think about it more.......if one provides the power and the other provides the ground.......then maybe either failing could take out both. I guess I need to see the schematic.
It's a weird thing how it works. The driver's is the master, but only because it duplicates the operation of the other three doors. When considering the electrical value of either switch to determine if it's a master or slave, then they're both equal. If either one fails the window will not move, and one contact can fail, keeping the window from moving in that direction, while the other contact can be just fine and allow operation in the other direction.
The ground path from the passenger motor is through the passenger switch, then through the driver switch, then to ground. The power path from the passenger motor is one of the following:
When passenger operates window: through the passenger switch to +12V
When driver operates window: through the passenger switch, to the driver switch, then to +12V
The passenger switch does not directly supply the ground; it has to go through the driver switch.
On Gen7, power for the front passenger is provided directly to the switch. The rear doors are provided power through the lockout switch on the driver's panel and then to each switch.
The rear doors function the same as the front passenger except for the source of power. If either one of them OR either of the driver switches fail, that window will not move in that direction.
When switches are at rest all contacts are at ground potential. When a switch is moved to operate a window, one contact loses ground and then goes to +12V. The other contact continues to provide the ground path.