Mercedes power window repair
From Finninday
Contents
Right front power window repair
What the switch should look like
What the switch looks like before cleaning
Switch panel disassembly
Taking apart switch panel
Taking apart switch panel
switch continuity test
There are four pins for each window switch. On bank of switches controls a front and bank window. The driver side also has a child lock with an extra two pins.
O = open circuit + = closed circuit
rocker at rest
| A | B | C | D | |
|---|---|---|---|---|
| A | O | O | O | |
| B | O | + | + | |
| C | O | + | + | |
| D | O | + | + |
rocker forward, window up
| A | B | C | D | |
|---|---|---|---|---|
| A | O | O | O | |
| B | O | O | + | |
| C | O | O | O | |
| D | O | + | O |
rocker backward, window down
| A | B | C | D | |
|---|---|---|---|---|
| A | O | O | O | |
| B | O | O | O | |
| C | O | O | + | |
| D | O | O | + |
Verified that the switch is operating properly. But the window still doesn't show any sign of life when the switch is pressed.
test window motor
Tips for fixing windows: http://www.benzworld.org/forums/w123-e-ce-d-cd-td/1653133-300td-console-window-switch-help-please.html
If you need to get your Widow up you need some Jumper Wires to connect to the Battery (easier to pull the Battery out). Touch one wire to each of the Terminal/Junction Block Screws and the Window will go one way. Swapping position of the Wires and the Window will go the other direction. The Window Motors do not use the Chassis ground as part of their circuit like the Starter Motor does.
From that same page:
Somemore thoughts on Power Windows. If the Window Motor does not work when you connect it direct to the Battery it is often the Motor Brushes worn out. People have gone in and replaced those. On the Rear Windows if they go up and down and make noise the Window Regulators back there bend. Can also be the above if the Motor turns but the Window does not. Window not working at all can be due to the Wires breaking where they Hinge at the Door. If all of the Windows shop working the Power Window Relay shares a Fuse with some other components. You need to look at your Fuse Chart th find which one.
Window motor diagrams: http://www.partsgeek.com/catalog/1983/mercedes/300td/body_mechanical_-ar-_trim/window_motor.html
