window pressure sensing
Super Member
Joined: May 2006
Posts: 546
Likes: 10
From: Cumberland, RI U.S.A.
2005 C230WZ SS Capri Blue/Ash
Interesting, because my 05 C230SS has it on all four windows as well as my moonroof. In fact, occasionally on the moonroof, it "thinks" it detects something in the way and almost closes then opens partway back again.
Cintoman
Cintoman
MBWorld Fanatic!
Joined: Jan 2005
Posts: 2,848
Likes: 15
From: Orange County
2005 C Wagon (No snickering please!)
A microprocessor reads the voltage, and if out of range for the firmware it cuts power to the motor. When the window reaches the top, the current goes up and the power is stopped. The module remembers the amount of current and stores that value. When you resync the window after a battery change a new value for current is read and stored.
Super Member
Joined: Jun 2005
Posts: 651
Likes: 5
From: So. Cal.
'02 C320 Wagon, '78 308 GTS, '06 Highlander Hybrid
A module in the door commands the window lift motor. The current passes through a low value resistor when the window is raised or lowered. The voltage across the resistor is the current in the motor. The higher the voltage, the higher the current.
A microprocessor reads the voltage, and if out of range for the firmware it cuts power to the motor. When the window reaches the top, the current goes up and the power is stopped. The module remembers the amount of current and stores that value. When you resync the window after a battery change a new value for current is read and stored.
A microprocessor reads the voltage, and if out of range for the firmware it cuts power to the motor. When the window reaches the top, the current goes up and the power is stopped. The module remembers the amount of current and stores that value. When you resync the window after a battery change a new value for current is read and stored.
