These things have fuses boxes all over the place and are a nightmare to work on :>Dįuse Box Diagram Mercedes-Benz M-Class (W164 2006. The sunroof shade module internally applies voltage and ground to the appropriate circuits of the reversible sunshade motor in order to move the sunshade panel to the open or closed positions. The sunroof shade module contains the logic for opening and closing the sunshade based on Serial Data from the sunroof control module. B+ is applied to the sunroof and sunroof shade modules via the S/ROOF fuse. Ignition voltage is supplied to the sunroof and sunroof shade modules by the BCM. When the modules reverse the polarity of the applied voltage, the motors reverse direction. The modules determine the motor direction based on inputs received from the sunroof switches. When a switch is pressed the signal circuit is pulled low signaling the sunroof or sunroof shade open or close request. The sunroof and sunroof shade modules supply each of the switch signal circuits with a 12-volt reference. For a description and operation of the RAP operation, refer to Retained Accessory Power (RAP) Description and Operation. Once the ignition switch is turned to OFF the sunroof will continue to operate until any door is opened or when the RAP timer reaches its shut-off limit. With the ignition in the run or accessory positions, the BCM supplies the sunroof and sunshade control modules with ignition voltage which allows sunroof and sunshade operation. The Power Sunroof System will operate only with the ignition turned to the RUN or Accessory positions, this allows for retained accessory power (RAP) control of the sunroof and sunshade through the body control module (BCM). Rail and track assembly upon which the sunroof and sunshade glass ridesĭon't be a parts changer, learn how to diagnose! So before you go wasting your money on parts not needed see if a professional scanner can communicate with all the modules on the vehicle.The Power Sunroof and Sunshade System consists of the following components: Changing batterys without a alternate power supply can cause modules to go to sleep permanently. Is there anything else to check before changing the motors ? Yeah, hook up a factory or some other type of professional scanner an check for DTC'S - diagnostic trouble codes,also to see if the scanner will communicate with the modules.
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