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DEFOGGER TSB Revision CHASSIS ELECTRICAL 54A-717 TECHNICAL DESCRIPTION (COMMENT) The rear window defogger is able to turn on while engine is run- . TROUBLESHOOTING HINTS • The A/C-ECU may be defective. • The rear window defogger relay may be defective. • The A/C control panel may be defective. • Damaged harness wires or connectors DIAGNOSIS Required Special Tools: • MB991223: Harness Set • MB992006: Extra Fine Probe STEP 1. Check the A/C and outside/inside air selection control motor work normally? "Malfunction of the A/C-ECU power supply system ." STEP 2. Check rear window defogger relay connector condition? 00E, Harness Connector Inspection . The rear window defogger system should work normally. |