Test Preparation For DTC Readout

Connect impulse counter scan tool and adapter or HHT to data link connector (X11/4).
Connect Yellow wire from impulse counter scan tool as follows:
1. Socket 8
  
  Base Module - BM (N16/1)
2. Socket 6
  
  ABS or ASR control module (N30 or N30/1) or ASR/SPS control module (N47-1) or ESP/SPS control module (N47-5)
3. Socket 12
  
  SPS control module (N49/1)
4. Socket 11
  
  ADS control module (N51)
5. Socket 4
  
  EDS control module (N39), LH-SFI or Right LH-SFI control module (N3/1 or N3/3), ME-SFI right engine control module (N3/10 or N3/12)
6. Socket 5
  
  Left LH-SFI control module (N3/2) or ME-SFI left engine control module (N3/11)
Turn ignition ON.
Read DTC memory (as applicable) for appropriately connected BM, ASR, ASR/SPS, ESP/SPS. ME-SFI, ADS, LH-SFI control modules.

Fig 1: Identifying Special Tools

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.