Is there a diy solution for my rear left side window that intermittently automatically lowers for clearance when the door is opened?
from p88 of 2012 cl class operator's manual as it relates to resetting the window for any reason (new battery install or resetting the pinch protection/ anti-entrapment feature):
you must rest each side window if:
1/ a front side window cannot be closed automatically.
2/ a side window opens again slightly after being closed manually.
1/ close all the doors.
2/ turn the smartkey to position 1 or 2 in the ignition lock.
3/ pull the corresponding switch on the door control panel until the side window is completely closed.
4/ hold the switch for an additional second.
if the side window opens again slightly,
1/ immediately pull the corresponding switch on the door control panel until the side window is completely closed.
2/ hold the switch for an additional second.
3/ if the corresponding side window remains closed after the button has been released, the side window has been reset correctly. if this is not the case, repeat the steps above again.
I have a message about the auxiliary battery. Where is it and how to change it? M-B CL63 (W216) 2012.