It sounds like you have the child lock of the rear power windows activated. It is a small left/right button between the front and rear left window switch on the front center console...
When the child lock is activated, the illumination in the switch in the rear will go out and power will be shut off.
Can you control the rear power windows with the buttons in the front?
greetingz,
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1990 300SL-24
1993 C250D with a minor 600+k kilometer
www.MBenzNL.com(the Netherlands)
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