{"model":"mk2","model_name":"MK2 Supra","vehicle":"Toyota Supra A60 (1982–1986, 5M-GE)","document":"Repair Manual","section":"BE","section_name":"Body Electrical System","page":63,"pages_in_section":121,"title":"Heater Troubleshooting","section_header":"Body Electrical System — Heater","ocr_text":"BODY ELECTRICAL SYSTEM — Heater                                BE-63\n\nHEATER\nTroubleshooting\n\nProblem | Possible cause | Remedy | Page\n\nBlower does not work when fan switch is on | Circuit breaker OFF | Reset breaker and check for short | BE-4\n | Heater main relay faulty | Check relay | BE-63\n | Heater blower switch faulty | Check switch | BE-63\n | Heater blower resistor faulty | Check resistor | BE-64\n | Heater blower motor faulty | Replace motor |\n | Wiring or ground faulty | Repair as necessary |\n\nIncorrect temperature output | Control cables broken or binding | Check cables | BE-64\n | Heater hoses leaking or clogged | Replace hose |\n | Water valve faulty | Replace valve |\n | Air dampers broken | Repair dampers |\n | Air ducts clogged | Repair ducts |\n | Heater radiator leaking or clogged | Replace radiator |\n | Heater control unit faulty | Repair control unit |\n\nHeater Blower Switch\n\nINSPECTION OF HEATER BLOWER SWITCH\n\nINSPECT SWITCH CONTINUITY\nInspect heater blower switch continuity.\n\nSwitch position | Terminal 10 | 4 | 9 | 5 | 8 | 6 0* | 7\nOFF | | | | | | o—o |\nI | o—o | | | | | o—o |\nII | o—o | o—o | | | | o—o |\nIII | o—o | | | o | | o—o |\nIV | o—o | | | | o | o—o |\n* For illumination light\n\nIf continuity is not as specified, replace the switch.\n\nHeater Relay\n\nINSPECTION OF HEATER MAIN RELAY\n\n1. 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