[tdsilk]

Hello,

I have a 1998 slk230 where the driver's side window will go down, but not back up when using the switch. The passenger window works fine. I can also get the window back up when using a separate battery power pack on the motor switch. I thought this might be the switch, but I recently purchased a new window switch. I'm not sure how to test the window switch so, I guess I need some guidance on what to test/check next?

Thanks!
Troy

 

[El_Toro_33809]

I'm not an electrical expert by any stretch of the imagination, but have an idea: I would think the switches are the same for the driver side and passenger side. What happens if you switch the switches?

Hopefully others with more knowledge will be here soon to offer more constructive assistance. Good luck.

Tim

 

[tdsilk]

update: I tried switching the window switches and the window will go down, but not up. I also ran a test with a multi-meter attached to the connection plug that connects to the window power motor (located inside the door). The multi-meter displayed little to know volts (1) volts when the window switch was pressed to put the window up. However, it showed 12 volts when the switch was pressed to put the window down. It appears that the window switch is working properly, but that there is not enough power going through the window up wire. Again, I also ruled out this being a window power motor or regulator issue because when I use my 12 volt power supply on the motor ports I'm able to put the widow up and down reversing the polarity. Other than tracing the wires from the driver side window switch are there any other suggestions anyone has?

Thank you.
Troy

 

[Aycee]

I would think the 'up'wire has broken with the constant opening and closing of the door. Check the continuity of the wire from the motor to the switch. It has probably broken where it goes through the door to the car. Try running another wire direct from the switch to the motor to confirm this.

 

[murat orhan]

Hi! I have similar problem. But only when the engine bay is very hot. Returns to normal when the car cools down. I suspect the related relay (if there is one) but couldn't find where it is.

you can check my post: http://www.slkworld.com/slk-r170-general-discussion/324641-intermittent-window-problem.html

 

[tdsilk]

@Aycee
Does it matter what type (thickness) of wire I can use for the test?
By the way, Great idea.

Troy

 

[Aycee]

I'd use a similar wire to the ones fitted already but just for checking I don't think it's critical.