{"model":"mk4","model_name":"MK4 Supra","vehicle":"Toyota Supra A80 (1993–2002, 2JZ-GE / 2JZ-GTE)","document":"Repair Manual","section":"SRS","section_name":"Supplemental Restraint System","page":52,"pages_in_section":102,"title":"Circuit Inspection Dtc (Normal) Source Voltage Drop Circuit Description","section_header":"Supplemental Restraint System — Troubleshooting","ocr_text":"RS–52\nSUPPLEMENTAL RESTRAINT SYSTEM – TROUBLESHOOTING\n\nCIRCUIT INSPECTION\n\nDTC (Normal) Source Voltage Drop\n\nCIRCUIT DESCRIPTION\nThe SRS is equipped with a voltage–increase circuit (DC–DC converter) in the center airbag sensor assembly in case the source voltage drops.\nWhen the battery voltage drops, the voltage–increase circuit (DC–DC converter) functions to increase the voltage of the SRS to normal voltage.\nThe diagnostic system malfunction display for this circuit is different to other circuits–when the SRS warning light remains lit up and the diagnostic trouble code is a normal code, voltage source drop is indicated.\nMalfunction in this circuit is not recorded in the center airbag sensor assembly, and the voltage source returns to normal, after approx. 10 seconds the SRS warning light automatically goes off.\n\nDTC No.          Diagnosis\n(Normal)          Voltage source drop.\n\nWIRING DIAGRAM\n\nJunction Block No. 1\nW    4         4    W\n1B        1J\n\nW-R   4      W-R\n1B1\n\nAM1\nAM2\n\nRelay Block No. 2\n\nBattery\nB\n\n5 P-L   8    CIG    6   L-R14   ACC\n1J        1G\n\n3B-O   3    IGN    10  B-O13   IG2\n1J        1G\n\nIgnition Switch\n\nJunction Block No. 1\n\nCenter Airbag Sensor Assembly\n\nR06901","image":"https://tsrm.sasquatchvc.com/images/mk4/SRS/SRS_052.png","url":"https://tsrm.sasquatchvc.com/mk4/tsrm/SRS/52","prev":{"page":51,"url":"https://tsrm.sasquatchvc.com/mk4/tsrm/SRS/51","api":"https://tsrm.sasquatchvc.com/api/pages/mk4/tsrm/SRS/51"},"next":{"page":53,"url":"https://tsrm.sasquatchvc.com/mk4/tsrm/SRS/53","api":"https://tsrm.sasquatchvc.com/api/pages/mk4/tsrm/SRS/53"},"section_url":"https://tsrm.sasquatchvc.com/mk4/tsrm/SRS","section_api_pages":["https://tsrm.sasquatchvc.com/api/pages/mk4/tsrm/SRS/1","https://tsrm.sasquatchvc.com/api/pages/mk4/tsrm/SRS/2","https://tsrm.sasquatchvc.com/api/pages/mk4/tsrm/SRS/3","https://tsrm.sasquatchvc.com/api/pages/mk4/tsrm/SRS/4","https://tsrm.sasquatchvc.com/api/pages/mk4/tsrm/SRS/5","https://tsrm.sasquatchvc.com/api/pages/mk4/tsrm/SRS/6","https://tsrm.sasquatchvc.com/api/pages/mk4/tsrm/SRS/7","https://tsrm.sasquatchvc.com/api/pages/mk4/tsrm/SRS/8","https://tsrm.sasquatchvc.com/api/pages/mk4/tsrm/SRS/9","https://tsrm.sasquatchvc.com/api/pages/mk4/tsrm/SRS/10","https://tsrm.sasquatchvc.com/api/pages/mk4/tsrm/SRS/11","https://tsrm.sasquatchvc.com/api/pages/mk4/tsrm/SRS/12","https://tsrm.sasquatchvc.com/api/pages/mk4/tsrm/SRS/13","https://tsrm.sasquatchvc.com/api/pages/mk4/tsrm/SRS/14","https://tsrm.sasquatchvc.com/api/pages/mk4/tsrm/SRS/15","https://tsrm.sasquatchvc.com/api/pages/mk4/tsrm/SRS/16","https://tsrm.sasquatchvc.com/api/pages/mk4/tsrm/SRS/17","https://tsrm.sasquatchvc.com/api/pages/mk4/tsrm/SRS/18","https://tsrm.sasquatchvc.com/api/pages/mk4/tsrm/SRS/19","https://tsrm.sasquatchvc.com/api/pages/mk4/tsrm/SRS/20","https://tsrm.sasquatchvc.com/api/pages/mk4/tsrm/SRS/21","https://tsrm.sasquatchvc.com/api/pages/mk4/tsrm/SRS/22","https://tsrm.sasquatchvc.com/api/pages/mk4/tsrm/SRS/23","https://tsrm.sasquatchvc.com/api/pages/mk4/tsrm/SRS/24","https://tsrm.sasquatchvc.com/api/pages/mk4/tsrm/SRS/25","https://tsrm.sasquatchvc.com/api/pages/mk4/tsrm/SRS/26","https://tsrm.sasquatchvc.com/api/pages/mk4/tsrm/SRS/27","https://tsrm.sasquatchvc.com/api/pages/mk4/tsrm/SRS/28","https://tsrm.sasquatchvc.com/api/pages/mk4/tsrm/SRS/29","https://tsrm.sasquatchvc.com/api/pages/mk4/tsrm/SRS/30","https://tsrm.sasquatchvc.com/api/pages/mk4/tsrm/SRS/31","https://tsrm.sasquatchvc.com/api/pages/mk4/tsrm/SRS/32","https://tsrm.sasquatchvc.com/api/pages/mk4/tsrm/SRS/33","https://tsrm.sasquatchvc.com/api/pages/mk4/tsrm/SRS/34","https://tsrm.sasquatchvc.com/api/pages/mk4/tsrm/SRS/35","https://tsrm.sasquatchvc.com/api/pages/mk4/tsrm/SRS/36","https://tsrm.sasquatchvc.com/api/pages/mk4/tsrm/SRS/37","https://tsrm.sasquatchvc.com/api/pages/mk4/tsrm/SRS/38","https://tsrm.sasquatchvc.com/api/pages/mk4/tsrm/SRS/39","https://tsrm.sasquatchvc.com/api/pages/mk4/tsrm/SRS/40","https://tsrm.sasquatchvc.com/api/pages/mk4/tsrm/SRS/41","https://tsrm.sasquatchvc.com/api/pages/mk4/tsrm/SRS/42","https://tsrm.sasquatchvc.com/api/pages/mk4/tsrm/SRS/43","https://tsrm.sasquatchvc.com/api/pages/mk4/tsrm/SRS/44","https://tsrm.sasquatchvc.com/api/pages/mk4/tsrm/SRS/45","https://tsrm.sasquatchvc.com/api/pages/mk4/tsrm/SRS/46","https://tsrm.sasquatchvc.com/api/pages/mk4/tsrm/SRS/47","https://tsrm.sasquatchvc.com/api/pages/mk4/tsrm/SRS/48","https://tsrm.sasquatchvc.com/api/pages/mk4/tsrm/SRS/49","https://tsrm.sasquatchvc.com/api/pages/mk4/tsrm/SRS/50","https://tsrm.sasquatchvc.com/api/pages/mk4/tsrm/SRS/51","https://tsrm.sasquatchvc.com/api/pages/mk4/tsrm/SRS/52","https://tsrm.sasquatchvc.com/api/pages/mk4/tsrm/SRS/53","https://tsrm.sasquatchvc.com/api/pages/mk4/tsrm/SRS/54","https://tsrm.sasquatchvc.com/api/pages/mk4/tsrm/SRS/55","https://tsrm.sasquatchvc.com/api/pages/mk4/tsrm/SRS/56","https://tsrm.sasquatchvc.com/api/pages/mk4/tsrm/SRS/57","https://tsrm.sasquatchvc.com/api/pages/mk4/tsrm/SRS/58","https://tsrm.sasquatchvc.com/api/pages/mk4/tsrm/SRS/59","https://tsrm.sasquatchvc.com/api/pages/mk4/tsrm/SRS/60","https://tsrm.sasquatchvc.com/api/pages/mk4/tsrm/SRS/61","https://tsrm.sasquatchvc.com/api/pages/mk4/tsrm/SRS/62","https://tsrm.sasquatchvc.com/api/pages/mk4/tsrm/SRS/63","https://tsrm.sasquatchvc.com/api/pages/mk4/tsrm/SRS/64","https://tsrm.sasquatchvc.com/api/pages/mk4/tsrm/SRS/65","https://tsrm.sasquatchvc.com/api/pages/mk4/tsrm/SRS/66","https://tsrm.sasquatchvc.com/api/pages/mk4/tsrm/SRS/67","https://tsrm.sasquatchvc.com/api/pages/mk4/tsrm/SRS/68","https://tsrm.sasquatchvc.com/api/pages/mk4/tsrm/SRS/69","https://tsrm.sasquatchvc.com/api/pages/mk4/tsrm/SRS/70","https://tsrm.sasquatchvc.com/api/pages/mk4/tsrm/SRS/71","https://tsrm.sasquatchvc.com/api/pages/mk4/tsrm/SRS/72","https://tsrm.sasquatchvc.com/api/pages/mk4/tsrm/SRS/73","https://tsrm.sasquatchvc.com/api/pages/mk4/tsrm/SRS/74","https://tsrm.sasquatchvc.com/api/pages/mk4/tsrm/SRS/75","https://tsrm.sasquatchvc.com/api/pages/mk4/tsrm/SRS/76","https://tsrm.sasquatchvc.com/api/pages/mk4/tsrm/SRS/77","https://tsrm.sasquatchvc.com/api/pages/mk4/tsrm/SRS/78","https://tsrm.sasquatchvc.com/api/pages/mk4/tsrm/SRS/79","https://tsrm.sasquatchvc.com/api/pages/mk4/tsrm/SRS/80","https://tsrm.sasquatchvc.com/api/pages/mk4/tsrm/SRS/81","https://tsrm.sasquatchvc.com/api/pages/mk4/tsrm/SRS/82","https://tsrm.sasquatchvc.com/api/pages/mk4/tsrm/SRS/83","https://tsrm.sasquatchvc.com/api/pages/mk4/tsrm/SRS/84","https://tsrm.sasquatchvc.com/api/pages/mk4/tsrm/SRS/85","https://tsrm.sasquatchvc.com/api/pages/mk4/tsrm/SRS/86","https://tsrm.sasquatchvc.com/api/pages/mk4/tsrm/SRS/87","https://tsrm.sasquatchvc.com/api/pages/mk4/tsrm/SRS/88","https://tsrm.sasquatchvc.com/api/pages/mk4/tsrm/SRS/89","https://tsrm.sasquatchvc.com/api/pages/mk4/tsrm/SRS/90","https://tsrm.sasquatchvc.com/api/pages/mk4/tsrm/SRS/91","https://tsrm.sasquatchvc.com/api/pages/mk4/tsrm/SRS/92","https://tsrm.sasquatchvc.com/api/pages/mk4/tsrm/SRS/93","https://tsrm.sasquatchvc.com/api/pages/mk4/tsrm/SRS/94","https://tsrm.sasquatchvc.com/api/pages/mk4/tsrm/SRS/95","https://tsrm.sasquatchvc.com/api/pages/mk4/tsrm/SRS/96","https://tsrm.sasquatchvc.com/api/pages/mk4/tsrm/SRS/97","https://tsrm.sasquatchvc.com/api/pages/mk4/tsrm/SRS/98","https://tsrm.sasquatchvc.com/api/pages/mk4/tsrm/SRS/99","https://tsrm.sasquatchvc.com/api/pages/mk4/tsrm/SRS/100","https://tsrm.sasquatchvc.com/api/pages/mk4/tsrm/SRS/101","https://tsrm.sasquatchvc.com/api/pages/mk4/tsrm/SRS/102"],"note":"OCR transcript of a scanned Toyota factory manual page; verify critical values (torque specs, part numbers) against the image."}