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TROUBLESHOOTING HEATER, AIR CONDITIONER AND VENTILATION 55A-77 INSPECTION PROCEDURE 14: The PTC heater does not work. <Vehicles with PTC heater> PTC Heater Circuit PTC PTC GLOW PTC PTC A/C-ECU A/C-ECU IGNITION ETACS- IG1 FUSIBLE 41 FUSIBLE 40 FUSIBLE 39 Wire colour code |