It's about the same process as described above (that was for a 123), on a 124 the switches are clipped into the plastic frame, and release from below in a similar manner. There are release tabs that need to be pushed in and then the switch pops out of the frame.

Your 1992 W124 has the convenience control system with the express down feature. Unlike all prior models, where the switches in the console directly switch the motor current, the switches in the console just send low current voltage signals to the convenience control module located under the left rear passenger seat. This module actually does all the switching of the four window motors.

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The OM 642/722.9 powered family
Still going strong
2014 ML350 Bluetec (wife's DD)
2013 E350 Bluetec (my DD)

both my kids cars went to junkyard in 2023
2008 ML320 CDI (Older son’s DD) fatal transmission failure, water soaked/fried rear SAM, numerous other issues, just too far gone to save (165k miles)
2008 E320 Bluetec (Younger son's DD) injector failed open and diluted oil with diesel, spun main bearings (240k miles)

1998 E300DT sold to TimFreeh
1987 300TD sold to vstech