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MANUAL A/C DIAGNOSIS TSB Revision HEATER, AIR CONDITIONING AND VENTILATION 55A-43 STEP 3. Using scan tool MB991958, check for any • WCM <vehicles with WCM> B2204: Coding data unmatched • KOS <vehicles with KOS> B2204: Coding data unmatched (1) Turn the ignition switch to the "ON" position. YES : Go to Step 5. STEP 4. Recheck for diagnostic trouble code. YES : A poor connection, open circuit or other intermittent malfunction is present in the lines between the NO : Replace the ETACS-ECU. On completion, check that the DTC is not reset. STEP 5. Recheck for diagnostic trouble code. YES : A poor connection, open circuit or other intermittent malfunction is present in the lines between the NO : Replace the A/C-ECU. On completion, check that the DTC is not reset. |