2005 Mercedes SLK-Class Owner's Manual - Page 240

Controls in detail Retractable hardtop Locking the retractable hardtop after raising/lowering Warning! Warning! G Warning! G G If the retractable hardtop is not fully opened or closed, a warning will sound after 15 seconds, pressure in the hardtop's hydraulic system will drop, and the hardtop will lower. Be sure to keep the hardtop switch pushed until the hardtop is fully opened or closed. The hydraulic pump will then shut off. To prevent possible accidents, drive the vehicle only with the hardtop either completely closed and locked, or fully lowered into its storage compartment. If the retractable hardtop does not completely open or close, the roof hydraulics will lose pressure and the retractable hardtop is lowered after approximately seven minutes when the ignition is switched on after approximately 15 seconds when the ignition is switched off Shortly before the hardtop is lowered, a warning will sound. In the multifunction display you will see K and the message Retractable roof being lowered. Properly lock the retractable hardtop before continuing to drive ( page 241). The hardtop is not fully closed and locked or not fully opened and locked if: the message Retractable roof in operation is shown in the multifunction display a warning sounds for ten seconds when starting to drive or while driving If the retractable hardtop is not properly locked, lock it as described below. 240