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MANUAL A/C DIAGNOSIS TSB Revision HEATER, AIR CONDITIONING AND VENTILATION 55A-104 STEP 2. Using scan tool MB991958, read the powertrain display unit. (3) Turn the ignition switch to the "LOCK" (OFF) position. YES : Go to Step 3. display unit − Diagnosis STEP 3. Using scan tool MB991958, check for any • ETACS-ECU DTC indicating a time-out error of middle-grade multi-center (1) Turn the ignition switch to the "ON" position. YES : Go to Step 5. AC305412 AB MB991910 DATA LINK CONNECTOR MB991824 MB991827 AC305412 AB MB991910 DATA LINK CONNECTOR MB991824 MB991827 |