I have a 1995 SL320 . I replace the ISC/CC throttle body because it was very noisey. Just before I relaced this part it was silent. No buzz or vibration. With the new part installed, it is still silent and inop. the codes I have from ASR ecu is 30 CAN: no reception from N4/1. HFM codes are 098 CAN: no reception from ASR. Fuses ok.

Might suggest the new part is bad, as long as you plugged it back in. Is it a new throttle motor (the part you replaced)?
Gilly

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