Comfort Roof Control Module for

  • Mercedes Benz SLK (R171)
  • Mercedes Benz CLK (A209)
  • Mercedes Benz SL (R230)

    v3.xx (All Versions)

  • Further information and manuals for all products can be found on our web site

    w w w . m o d s 4 c a r s . c o m

    We explicitly point out that all functions of this control unit should be used only while exercising caution and responsibility. We can NOT be held liable for any damage or injury caused by installing or using this product.
    Important Information. READ BEFORE INSTALLING!
    This manual is designed to produce completely filled pages. In order to get best print results, simply set the borders to minimum settings in the browser's page setup menu and disable headers and footers.

    Activate the print preview and if necessary decrease the zoom level until all pages are shown correctly.

    If you run into any problems after installing the module, please go over the manual again in great detail, clicking every photo for full size!
    We now have a full Knowledge Base with Support Ticket system available online at

    If you need to contact us, the best and fastest way to do so is by opening a support ticket there

    This module comes with our USB Field Upgrade and Configuration Port! We recommend connecting it to a computer BEFORE YOU INSTALL and using our support app "m4cconnect" to do a quick firmware update check. M4cconnect as well as all other information regarding USB update and configuration can be found at You can even configure and activate your favorite module functions and settings on screen before the module is installed in the car! It is a good idea to permanently install the USB cable with the module in the car, leaving the computer plug in an easily accessible spot for later use with a Wifi/3G/4G connected laptop.

    If the top does not work properly or at all after installing the module, these tips can be very helpful:

    1) Turn Function 1 (Main Switch) off (Setting 0). The module will be completely passive. If the problem still persists and the top won't work, check all connections. Please also check the green DATA LED on the module!

    2) Function 2 now has a valet mode (Setting 2) on many modules. Valet mode completely disables opening of the top. Check the setting for function 2 and make sure the module is NOT in valet mode!

    IMPORTANT: Not all modules have the valet mode! Please check the Operation and Programming Manual!

    The DATA LED shows the module status and helps troubleshooting issues during installation:

    When the ignition is ON: The LED should BLINK (flash) in a regular pattern (about 1x per second). This indicates that the module is receiving data and should work OK.

    When the ignition is OFF: The LED should BLINK (flash) as long as the data bus is still active and turn off after a while (max 5 min) indicating that the car has entered stand-by (sleep) mode.

    If the LED is permanently lit with the ignition ON, the module is NOT receiving data from the top controller and all connectors should be checked.

    If the LED does NOT light up at all when turning the ignition ON, the module is either not getting power or not receiving ANY data. All connectors should be checked.
    The red ERROR LED shows problem conditions and helps with troubleshooting during installation.

    LED flashes 1x
  • The module receives data on the CAN input but does not receive a response on the CAN output. The connection between the CAN BUS and the module is OK but the connection between module and top controller (smartTOP) or navigation unit (smartTV) is either interrupted or polarity reversed. Check all plugs ans connections!
    LED flashes 2x
  • For Mercedes modules: The module is receiving unexpected data on the CAN output from a device it expects to be on the CAN input! Very likely the module is connected to the WRONG CAN plug. Instead of just the top controller (smartTOP) or navigation (smartTV) other, unwanted control modules are connected "behind" our module. Undesired operation will be the result! It is important to find the one correct CAN plug!
    LED flashes 3x
  • For Mercedes modules: The device we are trying to control is found on the CAN input instead of the (required) CAN output and hence can not be controlled. The triple blink can be used to quickly identify the correct plug: One by one pull the can plugs until the red LED stops flashing 3x (instead it flashes once), then connect the found plug to the secondary input.
    This module is installed using the 3M wire taps very popular with 12V aftermarket industry for their reliability and durability. The most common problem during installation is a bad contact between the plugs from the supply wires and the wire taps. Please make absolutely sure that the metal blades of the plugs slide into the slots of the t-taps. It happens that the blade "misses" the slot and the connection looks correct, but doesn't make electrical contact!

    The T-taps come in RED (for thin wires), BLUE (for medium wires) and YELLOW (for thick wires).

    To test if you installed the module correctly after all wires are connected, turn the ignition fully on and watch the green LED on the module. It should blink (flash) to signal a correct installation. If the LED either does not turn on or stays on permanently, there is a bad contact or a missing connection! See detailed explanation of the DATA LED.
    The wiring kit for this module uses one or more of the TYCO connectors shown on the left. These are specialty automotive connectors designed for tight and secure electrical connections. In order to avoid reversing polarity, please pay attention to the small numbers embossed in the back of the plugs where the contacts are inserted. In case one of these plugs will need to be removed later, it can be done without any damage to the plastic cap or the crimp contacts. Please see our Knowledge Base article(s) regarding these plugs at
    Installation - Steps 1-3
    1. First, prepare the supplied wiring harness by installing the black connector caps as shown in the white box. Insert the short metal contacts into the smaller cap (left), RED wire in slot 1 and BLACK wire in slot 2. The contact numbers are embossed on the back of the plugs. If polarity is reversed, the module will NOT work! Install the long skinny metal contacts into the larger cap (right), again RED wire in slot 1 and BLACK wire in slot 2. Push the locking tabs down until they snap in place with an audible click.
    Now move the seat all the way back, then firmly grab under the plastic cover with both hands (on the inside) and pull up hard. The cover is held in place by the brackets marked with the red circles. IMPORTANT: On RHD cars (UK, Australia etc.) open up the right (always driver's) side.
    2. One torx screw (hidden under a plastic cap) holds the side panel in place. Pry out the little oval cover, then unscrew it. Take the side panel out by pushing it outward and down. Pay attention to how it interconnects with the other parts, so you can re-install it correctly later.
    3. Pull up the carpet all the way along the left side. Beneath it there is a black wire harness box. Its cover is held in place by plastic tabs. Unclip the tabs and pull the plastic cover up.
    Installation - Steps 4-6
    4. Search the harness box for the CAN BUS distribution terminal. It's a plastic strip with brown and brown/red wires going to it. Ignore the one with the green wires!
    5. To get the GROUND connection for the module, attach a BLUE T-Tap to the PLAIN BROWN wire coming from the big black and blue plastic connector shown here.
    6. To get the permanent +12V connection for the module, attach the other BLUE T-Tap to the RED/WHITE wire next to the brown one (on the same connector). Now connect the plugs from the module's wiring harness to both T-Taps, making sure the metal blades of the plugs actually slide INTO the slots of the T-Taps.
    Installation - Steps 7-9
    7. Now the plastic bracket must be removed, before any of the CAN BUS plugs can be pulled out. It is held in place by two tabs on the sides. Push the tabs outward while simultaneously pulling the cover piece upward or stick a screwdriver between the bracket and the terminal block and carefully pry it off. It is a bit tricky to get off, so please be patient and don't use brute force. With the cover gone, the plugs can be removed. The following step explains in detail, how to find the correct plug.
    8. Finding the correct CAN plug - PLEASE WATCH THE VIDEO. Connect the smartTOP module with the module harness (making sure the latch is engaged). Connect the small plug to the CAN bus and tap the unlock button once. Watch the LEDs on the module. Now disconnect the other small plugs one by one (one at a time) until the RED LED on the module stops blinking 3x and instead blinks 1x. The correct plug is now found and can be connected to the matching socket on the module harness. A successful installation is indicated by the GREEN LED blinking.
    9. Place the smartTOP module inside the harness box (picture shows SLK for reference). Turn ignition on and check the LED on the module. A slow flashing pattern shows that everything is connected correctly. If it stays lit constantly or does not light up at all, check the InstallAID™ section at the end of this manual for help. Close the lid and make sure all tabs snap back in place. Replace carpet and side panel. Make sure you snap the side panel in place correctly, as there may be tabs that interconnect with other plastic parts of the dash or the hood release lever cover parts. Replace screws and plastic cover. Installation is complete.
    Installation - Additional Steps
    To allow the module to activate the horn for the CHIRP feature, open the fuse box in the right corner of the engine compartment and reseat the fuse shown from position 43A, left slots (1) to position 43B, right slots (2). This change does not affect anything else.
    NO fuse needs to removed and NO fuse needs to be added. Just RE-SEAT the already existing fuse.