my 99 Mercedes clk320a windows are not working unless I undo the battery and then hook it back up. Why is this happning?

Question

All fuses are good, the windows roll down fine after the battery gets unplugged then plugged back in. Is this a security problem and if so do I need to have it reset by the mercedes dealership? Or could this be another problem?

Answer 1

Yes, Alexander is correct!

They need to have the window position Resynchronised with the Door control module!



Procedure:

Power Window Synchronization, Function - GF72.29-P-4003A



MODEL 202 as of 1.6.97, 208, 210.081 /281, 210 (except 210.081 /281) as of 1.3.97



Definition



Synchronization means the counter status for position recognition in the door control module (N69/1) or (N69/2), (models 202/210 also N69/3 or N69/4), is set to the actual position of the side window. Synchronization is necessary when the door control module has been separated from the power supply (e.g. by disconnecting the battery, removing or installing the door control module), or following a desynchronization . When a window is not synchronized the door control module does not know in which position the window is and in which direction it is necessary to move the power window motor in order to close the window. For this reason synchronization is a prerequisite for proper operation of the one-touch window up/down control for the power window.



Synchronizing



Close window in question with power window switch or convenience feature until power window motor locks up, then continue to actuate switch. The door control module continues to actuate the motor and sets the counter for position recognition to zero when motor lock-up has been recognized for at least 0.3 sec. The window is then synchronized. This means that the door control module can now switch off the power window motor before reaching the lock-up position when opening and closing the window.



The window remains synchronized as long as it is not desynchronized .



IMPORTANT Model 208: For synchronization it is necessary for the door in question to be closed.



Resynchronizing



Resynchronization is accomplished when the power window switch is held down in the closed direction for longer than 0.3 seconds even though the zero position has already been reached.

Answer 2

Google the reset procedure for the windows. You might need to follow it for the car to relearn where the top and bottom of the door is. The reason they stop might be because the computer doesn't know where the glass is relative to the door. The seats in your car are that way. I've had to resync mine for them to work.



Alternatively it could be something such as a bad relay or switch or possibly the security system. Start small and work your way up to the more complicated scenarios.

Answer 3

Relay.