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WINDSHIELD WIPER AND WASHER TSB Revision EXTERIOR 51-27 STEP 1. Use the scan tool MB991958 to check if an ." Q: Is the diagnostic trouble code set? YES : Diagnose the ETACS-ECU. Refer to GROUP 54A ETACS, "Diagnostic trouble code chart ." NO : Go to Step 2. STEP 2. Using scan tool MB991958, check data list. • Ignition switch: ACC • Operate the windshield wiper switch at each switch posi- tion. OK: Normal condition is displayed. AC608435 Data link connector MB991827 MB991824 MB991910 AB Item No. Item name Windshield Normal Item 235 Front wiper LO ON HI INT ON and MIST ON Item 288 ACC switch ON |