{"model":"mk4","model_name":"MK4 Supra","vehicle":"Toyota Supra A80 (1993–2002, 2JZ-GE / 2JZ-GTE)","document":"Repair Manual","section":"AC","section_name":"Air Conditioning","page":59,"pages_in_section":111,"title":"Inspection Procedure","section_header":"Air Conditioning System — Troubleshooting","ocr_text":"AC–59\nAIR CONDITIONING SYSTEM – TROUBLESHOOTING\n\nINSPECTION PROCEDURE\n\n1 Check voltage between terminal HR of A/C amplifier connector and body ground.\n\nON\nConnect\n\nP Remove the A/C amplifier with connectors still connected\n\nC Measure voltage between terminals HR of A/C amplifier connector and body ground when ignition switch is ON and OFF.\n\nOK\nIgnition Switch          Voltage\nOFF                      OV\nON     Blower ON         Below 1.O V\n       Blower OFF        Battery positive voltage\n\nBE3840\nNO8781\n\nNG\n\nOK Proceed to next circuit inspection shown on matrix chart (See page AC–26).\n\n2 Check heater relay.\n\nC Check continuity between each pair of terminals of heater relay shown below.\n\nOK\nTerminals 4 and 5        No continuity\nTerminals 1 and 3        Continuity\nTerminals 2 and 4        Continuity\n\nP\n1. Apply battery positive voltage between terminals 1 and 3.\n2. Check continuity between each pair of terminal shown below.\n\nOK\nTerminals 2 and 4        No continuity\nTerminals 4 and 5        Continuity\n\nBE1850 BE1844\n\nOK\n\nNG Replace heater relay.\n\n3 Check HTR fuse.\n\nOK\n\nNG Check for short in all the harness and components to the HTR fuse (See attached wiring diagram).\n\nCheck and repair harness and connector between A/C amplifier and 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