TSRM/MK4 Supra/Repair Manual
Repair ManualWiring Diagrams
p.112
WD/Wiring Diagrams113 / 277
p.114
SYSTEM OUTLINE — MK4 Supra Wiring Diagrams, page 113
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SYSTEM OUTLINE CURRENT IS APPLIED AT ALL TIMES THROUGH THE STOP FUSE TO TERMINAL 2 OF THE STOP LIGHT SW. WHEN THE IGNITION SW IS TURNED ON, CURRENT FLOWS FROM THE GAUGE FUSE TO TERMINAL 8 OF THE LIGHT FAILURE SENSOR, AND ALSO FLOWS THROUGH THE REAR LIGHT WARNING LIGHT TO TERMINAL 4 OF THE LIGHT FAILURE SENSOR. STOP LIGHT DISCONNECTION WARNING WHEN THE IGNITION SW IS TURNED ON AND THE BRAKE PEDAL IS PRESSED (STOP LIGHT SW ON), IF THE STOP LIGHT CIRCUIT IS OPEN, THE CURRENT FLOWING FROM TERMINAL 7 OF THE LIGHT FAILURE SENSOR TO TERMINAL 2 CHANGES, SO THE LIGHT FAILURE SENSOR DETECTS THE DISCONNECTION AND THE WARNING CIRCUIT OF THE LIGHT FAILURE SENSOR IS ACTIVATED. AS A RESULT, THE CURRENT FLOWS FROM TERMINAL 4 OF THE LIGHT FAILURE SENSOR → TERMINAL 11 → GROUND AND TURNS THE REAR LIGHT WARNING LIGHT ON. BY PRESSING THE BRAKE PEDAL, THE CURRENT FLOWING TO TERMINAL 8 OF THE LIGHT FAILURE SENSOR KEEPS THE WARNING CIRCUIT ON HOLDING AND THE WARNING LIGHT ON UNTIL THE IGNITION SW IS TURNED OFF. SERVICE HINTS S11 STOP LIGHT SW 2–1 : CLOSED WITH BRAKE PEDAL DEPRESSED L 2 LIGHT FAILURE SENSOR 2, 7–GROUND : APPROX. 12 VOLTS WITH STOP LIGHT SW ON 4, 8–GROUND : APPROX. 12 VOLTS WITH IGNITION SW AT ON POSITION 11–GROUND : ALWAYS CONTINUOUS : PARTS LOCATION CODE SEE PAGE CODE SEE PAGE CODE SEE PAGE H14 30 R 9 30 S11 29 L 2 30 R10 30 T 6 29 : JUNCTION BLOCK AND WIRE HARNESS CONNECTOR CODE SEE PAGE JUNCTION BLOCK AND WIRE HARNESS (CONNECTOR LOCATION) 1C 20 FLOOR NO. 2 WIRE AND J/B NO. 1 (LEFT KICK PANEL) 1E 20 INSTRUMENT PANEL WIRE AND J/B NO. 1 (LEFT KICK PANEL) 1H 1I 20 COWL WIRE AND J/B NO. 1 (LEFT KICK PANEL) : CONNECTOR JOINING WIRE HARNESS AND WIRE HARNESS CODE SEE PAGE JOINING WIRE HARNESS AND WIRE HARNESS (CONNECTOR LOCATION) IE1 36 INSTRUMENT PANEL WIRE AND FLOOR NO. 2 WIRE (LEFT KICK PANEL) BM1 40 BACK DOOR NO. 1 WIRE AND FLOOR NO. 2 WIRE (LEFT SIDE OF PACKAGE TRAY TRIM) B01 40 BACK DOOR NO. 2 WIRE AND BACK DOOR NO. 1 WIRE (BACK DOOR UPPER LEFT) : GROUND POINTS CODE SEE PAGE GROUND POINTS LOCATION BI 40 LEFT QUARTER PILLAR BJ 40 LOWER BACK PANEL CENTER : SPLICE POINTS CODE SEE PAGE WIRE HARNESS WITH SPLICE POINTS CODE SEE PAGE WIRE HARNESS WITH SPLICE POINTS B 3 B 5 40 FLOOR NO. 2 WIRE B 7 40 FLOOR NO. 2 WIRE H14 L 2 R 9 R10 S11 BLUE T 6 115