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OK, According to ALLDATA (well.. a posted Mercedes Service Bulletin), looks like #14 is used for lambda reading.
When I hooked up my DIY LED reader's test plug to #14 (with black in #1 and red in #3), the LED lit up without even pushing the button. This tells me that it was an active ground. Needless to say, I did not push the button, as I was afraid of shorting something out.
Still trying to find out what #13 is used for. Anyone? Description is TNA-signal (gasoline), LH-SFI engines. I get no return signal with my DIY LED tool.
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