TSRM/MK4 Supra/Repair Manual
Repair ManualWiring Diagrams
p.191

WD/Wiring Diagrams — System Outline, page 192

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p.193
System Outline — MK4 Supra Wiring Diagrams, page 192
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Page text (OCR transcript)
SYSTEM OUTLINE
CURRENT ALWAYS FLOWS TO TERMINAL 1 OF THE INTEGRATION RELAY THROUGH DOME FUSE.

1. SEAT BELT WARNING SYSTEM
WHEN 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.

2. UNLOCK WARNING SYSTEM
WITH 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.

SERVICE HINTS
B 6 BUCKLE SW LH
1–2 : CLOSED WITH DRIVER'S SEAT BELT IN USE
D10 DOOR COURTESY SW LH
3–2 : CLOSED WITH LH DOOR OPEN
U 1 UNLOCK WARNING SW
2–1 : CLOSED WITH IGNITION KEY IN CYLINDER
INTEGRATION RELAY
10–GROUND : ALWAYS CONTINUOUS
6–GROUND : CONTINUOUS WITH DRIVER'S DOOR OPEN
5–GROUND : CONTINUOUS WITH IGNITION KEY IN CYLINDER
8–GROUND : CONTINUOUS WITH DRIVER'S SEAT BELT IN USE
9–GROUND : 0 VOLTS WITH IGNITION SW ON AND BUCKLE SW OFF
1–GROUND : ALWAYS APPROX. 12 VOLTS

○ : PARTS LOCATION
CODE    SEE PAGE    CODE    SEE PAGE    CODE    SEE PAGE
B 6     28          T 6     29
D10     30          U 1     29

○ : RELAY BLOCKS
CODE    SEE PAGE    RELAY BLOCKS (RELAY BLOCK LOCATION)
2       22          R/B NO. 2 (ENGINE COMPARTMENT LEFT)

○ : JUNCTION BLOCK AND WIRE HARNESS CONNECTOR
CODE    SEE PAGE    JUNCTION BLOCK AND WIRE HARNESS (CONNECTOR LOCATION)
1B      20          ENGINE ROOM MAIN WIRE AND J/B NO. 1 (LEFT KICK PANEL)
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)
1I
1J      20          COWL WIRE AND J/B NO. 1 (LEFT KICK PANEL)
1K

□ : CONNECTOR JOINING WIRE HARNESS AND WIRE HARNESS
CODE    SEE PAGE    JOINING WIRE HARNESS AND WIRE HARNESS (CONNECTOR LOCATION)
IC2     36          FLOOR NO. 2 WIRE AND COWL WIRE (LEFT KICK PANEL)

▽ : GROUND POINTS
CODE    SEE PAGE    GROUND POINTS LOCATION
IE      36          LEFT KICK PANEL
BI      40          LEFT QUARTER PILLAR

○ : SPLICE POINTS
CODE    SEE PAGE    WIRE HARNESS WITH SPLICE POINTS    CODE    SEE PAGE    WIRE HARNESS WITH SPLICE POINTS
I 7     38          FLOOR NO. 2 WIRE

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