Just the other day I started having an electric window issue. It is my rear window on the drivers side. I mashed the switch button up front and nothing happened. So I mashed the switch button on the rear door and nothing happened. Prior to this the window seemed to be working just fine. The motor sounded normal, and it wasn't acting sluggish or anything like that. About a day later the same window started working fine again from both switches, but now it has stopped working again. Could this be a relay or something? Any help diagnosing this problem would be greatly appreciated. Thanks.

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2006 E320CDI- current dd
1999 E300TD - retired
Wilmington, NC USA