[. . . ] Attention: Pay attention that the cables do not contact with the housing. Connection with in-vehicle system plugs Removal of the car radio Insert the brackets right and left into the provided trimplate holes and push in until you hear a distinct click (lateral springs are unlocked). 4 Ground cable Do not connect the ground cable to the negative pole of the battery. [. . . ] 4 Ground cable Do not connect the ground cable to the negative pole of the battery. Route the ground cable to a suitable ground point (car body screw, car body metal sheet) and shorten it accordingly. Remove the insulation from the ground cable and attach the forked cable lug (if necessary, solder it). Scratch off the paint from the contact area of the ground point and lubricate it with graphite grease (important for good ground contact). Positive cable (ACC + 12 V) (ignition) +12V Do not use the positive/negative system connectors provided in the vehicle!For connecting all positive and negative wiring, use connection cable 7 607 884 093, fig. Some Mercedes vehicles are equipped with a 10-pin connector located in the installation compartment. +12V The control cable represents the switched positive output for external components, e. Do not connect the control cable to pin 15 (switched +) or pin 30 (permanent +12 V). Modifications reserved Preparation of car radio installation Install the car radio into the DIN cut-out provided in your car's dashboard ex factory. Prepare the car radio DIN cut-out (unlock shelf or dummy cover) or cut out the car radio compartment to 182 x 53 mm. Grasp behind the car radio cut-out and check how many of the fixing strips of the car radio support can be bent. Insert the support into the cut-out and bend the appropriate fixing strips with a screwdriver, see fig. 6 Use the adapter cable enclosed to the amplifier or the adaptercable 7 607 874 003. [. . . ] Grasp behind the car radio cut-out and check how many of the fixing strips of the car radio support can be bent. Insert the support into the cut-out and bend the appropriate fixing strips with a screwdriver, see fig. 6 Use the adapter cable enclosed to the amplifier or the adaptercable 7 607 874 003. [. . . ]