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SYMPTOM PROCEDURES TSB Revision SIMPLIFIED WIRING SYSTEM (SWS) 54B-423 INSPECTION PROCEDURE J-4: The fog light indicator does not illuminate normally. NOTE: This troubleshooting procedure requires the . CIRCUIT OPERATION . TECHNICAL DESCRIPTION (COMMENT) . TROUBLESHOOTING HINTS • Trouble in input signal system • The wiring harness or connectors may have loose, corroded, or damaged terminals, or termi- • The combination meter may be defective • The ETACS-ECU may be defective . DIAGNOSIS Required Special Tools: • MB991223: Harness Set • MB991958: Scan Tool (MUT-III Sub Assembly) • MB991824: Vehicle Communication Interface (V.C.I.) • MB991827: MUT-III USB Cable • MB991910: MUT-III Main Harness A • MB991813: SWS Monitor Kit • MB991806: SWS Monitor Cartridge • MB991812: SWS Monitor Harness (For Column-ECU) • MB991822: Probe Harness ETACS- COMBINATION FOG LIGHT CAN COMMUNICATION LINE CAN COMMUNICATION LINE Fog Light Indicator Light Circuit |