PeachParts Mercedes-Benz Forum - View Single Post - raise electric window manually? w123 coupe rear quarter winow

Jeremy5848 · #3 07-04-2006, 02:09 PM

Quote:

Originally Posted by pleiades

strangely enough there does seem to be a 12V drop across the two leads to/from the motor... what is that 12V doing?

Can you put an ohmmeter across the motor leads? I've never measured the DC resistance of a window motor but it should be a few ohms, I would imagine. If the motor is jammed or frozen, then it would draw current but not move. An open circuit in the motor should show infinite resistance. A short to ground should blow fuses. Power window regulators sometimes have cutoff switches that stop the motor when the travel limits are reached. If the switch has gone bad or a lead has broken, it could prevent the motor from reversing.

Regretfully, I've not had experience with Mercedes power windows. However, if they are in any way similar to 1965 Olds Cutlass windows, then you have to get the motor to work or disconnect the linkage before you can get the window up.