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DIAGNOSIS TSB Revision CONTROLLER AREA NETWORK (CAN) 54C-73 STEP 9. Using scan tool MB991958, diagnose the CAN bus CAUTION Strictly observe the specified wiring harness repair proce- CAUTION To prevent damage to scan tool MB991958, always turn the (4) Diagnose CAN bus lines, and check if the scan tool MB991958 screen is as shown in the figure. OK: The display of the scan tool MB991958 is as Q: Does scan tool MB991958 screen correspond to the illustration? repair if necessary. If the intermediate connector is in NO : Check AWD-ECU connector C-128, and repair if necessary. If the AWD-ECU connector is in good ZC501967 AC404789 AC702802 MB991824 MB991827 MB991910 Data link connector AB ACA02847AC : Red section on screen M.U.T. F.A.S.T. SRS OCM A/C AUDIO MMCS Sat Radio METER JC ETACS JC JC SAS AWC ABS/ASC AT/CVT ENGINE |