{"model":"mk4","model_name":"MK4 Supra","vehicle":"Toyota Supra A80 (1993–2002, 2JZ-GE / 2JZ-GTE)","document":"Electrical Wiring Diagram","section":"USBW","section_name":"Unlock and Seat Belt Warning","page":2,"pages_in_section":3,"title":"Seat Belt and Unlock Warning System","section_header":"Warning System","ocr_text":"SYSTEM OUTLINE\n\nCURRENT ALWAYS FLOWS TO TERMINAL 1 OF THE INTEGRATION RELAY THROUGH DOME FUSE.\n\n1. SEAT BELT WARNING SYSTEM\n\nWHEN THE IGNITION SW IS TURNED ON, CURRENT FLOWS FROM THE GAUGE FUSE TO TERMINAL 7 OF THE INTEGRATION RELAY. AT THE SAME TIME, CURRENT FLOWS TO TERMINAL 9 OF THE RELAY FROM THE GAUGE FUSE THROUGH THE SEAT BELT WARNING LIGHT. THIS CURRENT ACTIVATES THE INTEGRATION RELAY AND CURRENT FLOWING THROUGH THE WARNING LIGHT FLOWS FROM TERMINAL 9 OF THE RELAY → TERMINAL 10 → GROUND, CAUSING THE WARNING LIGHT TO LIGHT UP. A BUCKLE SW OFF SIGNAL IS INPUT TO TERMINAL 8 OF THE RELAY, THE CURRENT FLOWING TO TERMINAL 7 OF THE RELAY FLOWS THROUGH TERMINAL 10 → GROUND AND THE SEAT BELT WARNING BUZZER SOUNDS FOR APPROX. 4–8 SECONDS. HOWEVER, IF THE SEAT BELT IS PUT ON DURING THIS PERIOD (WHILE THE BUZZER IS SOUNDING), SIGNAL INPUT TO TERMINAL 8 OF RELAY STOPS AND THE CURRENT FLOW FROM TERMINAL 7 OF THE RELAY → TERMINAL 10 → GROUND IS CUT, CAUSING THE BUZZER TO STOP.\n\n2. UNLOCK WARNING SYSTEM\n\nWITH THE IGNITION KEY INSERTED IN THE KEY CYLINDER (UNLOCK SW ON), THE IGNITION SW STILL OFF AND DRIVER'S DOOR OPENS (DOOR COURTESY SW ON), WHEN A SIGNAL IS INPUT TO TERMINAL 6 OF THE RELAY, THE INTEGRATION RELAY OPERATES. CURRENT FLOWS FROM TERMINAL 7 OF THE RELAY → TERMINAL 10 → GROUND AND UNLOCK WARNING BUZZER SOUNDS.\n\nSERVICE HINTS\n\nB 6 BUCKLE SW LH\n1–2 : CLOSED WITH DRIVER'S SEAT BELT IN USE\n\nD10 DOOR COURTESY SW LH\n3–2 : CLOSED WITH LH DOOR OPEN\n\nU 1 UNLOCK WARNING SW\n2–1 : CLOSED WITH IGNITION KEY IN CYLINDER\n\nINTEGRATION RELAY\n10–GROUND : ALWAYS CONTINUOUS\n6–GROUND : CONTINUOUS WITH DRIVER'S DOOR OPEN\n5–GROUND : CONTINUOUS WITH IGNITION KEY IN CYLINDER\n8–GROUND : CONTINUOUS WITH DRIVER'S SEAT BELT IN USE\n9–GROUND : 0 VOLTS WITH IGNITION SW ON AND BUCKLE SW OFF\n1–GROUND : ALWAYS APPROX. 12 VOLTS\n\n: PARTS LOCATION\n\nCODE         SEE PAGE         CODE         SEE PAGE         CODE         SEE PAGE\nB 6          28               T 6          29\nD10          30               U 1          29\n\n: RELAY BLOCKS\n\nCODE         SEE PAGE         RELAY BLOCKS (RELAY BLOCK LOCATION)\n2            22               R/B NO. 2 (ENGINE COMPARTMENT LEFT)\n\n: JUNCTION BLOCK AND WIRE HARNESS CONNECTOR\n\nCODE         SEE PAGE         JUNCTION BLOCK AND WIRE HARNESS (CONNECTOR LOCATION)\n1B           20               ENGINE ROOM MAIN WIRE AND J/B NO. 1 (LEFT KICK PANEL)\n1C           20               FLOOR NO. 2 WIRE AND J/B NO. 1 (LEFT KICK PANEL)\n1E           20               INSTRUMENT PANEL WIRE AND J/B NO. 1 (LEFT KICK PANEL)\n1I\n1J           20               COWL WIRE AND J/B NO. 1 (LEFT KICK PANEL)\n1K\n\n: CONNECTOR JOINING WIRE HARNESS AND WIRE HARNESS\n\nCODE         SEE PAGE         JOINING WIRE HARNESS AND WIRE HARNESS (CONNECTOR LOCATION)\nIC2          36               FLOOR NO. 2 WIRE AND COWL WIRE (LEFT KICK PANEL)\n\n: GROUND POINTS\n\nCODE         SEE PAGE         GROUND POINTS LOCATION\nIE           36               LEFT KICK PANEL\nBI           40               LEFT QUARTER PILLAR\n\n: SPLICE POINTS\n\nCODE         SEE PAGE         WIRE HARNESS WITH SPLICE POINTS         CODE         SEE PAGE         WIRE HARNESS WITH SPLICE POINTS\nI7           38               FLOOR NO. 2 WIRE\n\n195","image":"https://tsrm.sasquatchvc.com/images/mk4-ewd/USBW/USBW_002.png","url":"https://tsrm.sasquatchvc.com/mk4/ewd/USBW/2","prev":{"page":1,"url":"https://tsrm.sasquatchvc.com/mk4/ewd/USBW/1","api":"https://tsrm.sasquatchvc.com/api/pages/mk4/ewd/USBW/1"},"next":{"page":3,"url":"https://tsrm.sasquatchvc.com/mk4/ewd/USBW/3","api":"https://tsrm.sasquatchvc.com/api/pages/mk4/ewd/USBW/3"},"section_url":"https://tsrm.sasquatchvc.com/mk4/ewd/USBW","section_api_pages":["https://tsrm.sasquatchvc.com/api/pages/mk4/ewd/USBW/1","https://tsrm.sasquatchvc.com/api/pages/mk4/ewd/USBW/2","https://tsrm.sasquatchvc.com/api/pages/mk4/ewd/USBW/3"],"note":"OCR transcript of a scanned Toyota factory manual page; verify critical values (torque specs, part numbers) against the image."}