Just purchased 2005 c230 Kompressor Coupe, it came only with one smartkey. It works ONLY thru infrared but not thru RF. AM radio does not work, will scan but does not pick-up any station. I have replaced the batteries in smartkey. I suspect the RF antenna is not working.

Anyone has any suggestions, wiring diagram for the antenna?

Thank you.

 

You likely have the problem with the antenna amplifier on the rear window. On the coupe models, you must remove the glass to replace the amplifier....very common. If you have window tint, that is known to cause many problems too.

 

Thank you, do you know if the amplifier can be purchased from a source other than MB?