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SWS DIAGNOSIS TSB Revision SIMPLIFIED WIRING SYSTEM (SWS) 54B-259 Inspection Procedure N-15: Column switch: The windshield mist wiper switch, windshield CIRCUIT OPERATION TECHNICAL DESCRIPTION (COMMENT) TROUBLESHOOTING HINTS • Malfunction of the column switch (windshield • Malfunction of the ETACS-ECU • Damaged harness wires or connectors DIAGNOSIS Required Special Tools: • MB991223: Test Harness Set STEP 1. Check the ignition switch positions. Q: Does a diagnostic trouble code set when the ignition switch is at any of the positions? Diagnostic Trouble Code Chart. Refer to NO : Go to Step 2. AC004263 Windshield Wiper and Windshield Washer Switch Input Circuit |