Release pressure in pressure reservoir for hydraulic power window in front door - AR72.10-P-1800-06SXS

When relieving the pressure in the pressure reservoir for the hydraulic power window on the front door, ensure that the transmitter key is removed from the EIS control unit.

1. Open front door and remove emergency operation handle (1) from door lining.

   The emergency operation handle (1) serves for manual actuation of the hydraulic valves in the block valve (2) for lifting and lowering the crank window.

   Fig 1: Releasing Pressure In Pressure Reservoir

   Courtesy of MERCEDES-BENZ USA
2. Attach emergency operation handle (1) to bottom valve actuation, pull upward and hold until crank window is fully lowered.
3. Attach emergency operation handle (1) to upper valve actuation, pull down and hold until crank window is fully rolled up.
4. Roll crank window up and down until it stops indicating that the pressure in the pressure reservoir is completely relieved.

   Rolling the crank window up and down causes the hydraulic oil to flow out of hydraulic reservoir back into the power window hydraulic pump.