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.