TSRM/MK4 Supra/Repair Manual
Repair ManualWiring Diagrams
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WD/Wiring Diagrams, page 202

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Wiring Diagrams — MK4 Supra Wiring Diagrams, page 202
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Page text (OCR transcript)
SYSTEM OUTLINE

WHEN THE IGNITION SW IS TURNED ON, CURRENT FLOWS TO TERMINAL 2 OF THE WASHER MOTOR, TERMINAL 1 OF THE REAR WIPER MOTOR AND RELAY THROUGH THE WIPER FUSE.

1. REAR WIPER NORMAL OPERATION
WITH THE IGNITION SW TURNED ON AND THE REAR WIPER AND WASHER SW TURNED ON, THE CURRENT FLOWING TO TERMINAL 1 OF THE REAR WIPER RELAY FLOWS TO TERMINAL 3 OF THE RELAY → TERMINAL 1 OF THE REAR WIPER AND WASHER SW → TERMINAL 16 → TO GROUND. THUS, THE RELAY COIL IS ACTIVATED AND THE CURRENT TO TERMINAL 1 OF THE REALY FLOWS TO TERMINAL LM → TERMINAL LM OF THE REAR WIPER MOTOR → MOTOR → TO GROUND AND CAUSES THE MOTOR TO OPERATE THE WIPER.

2. REAR WIPER INTERMITTENT OPERATION
WHEN THE IGNITION SW IS ON AND THE REAR WIPER AND WASHER SW IS TURNED TO INT POSITION, CURRENT FLOWING TO TERMINAL 1 OF THE REAR WIPER MOTOR AND RELAY FLOWS TO TERMINAL 2 OF THE RELAY → TERMINAL 10 OF THE REAR WIPER AND WASHER SW → TERMINAL 16 → GROUND.
THIS CAUSES THE MOTOR TO OPERATE (THE POINT CHANGES) AND THE INTERMITTENT CIRCUIT OF THE RELAY OPERATES. INTERMITTENT OPERATION OF THE CIRCUIT IS CONTROLLED BY THE CHANGING AND DISCHARGING OF THE CONDENSER INSTALLED INSIDE THE RELAY.

3. WASHER OPERATION
WITH THE IGNITION SW TURNED ON AND THE REAR WIPER AND WASHER SW TURNED TO ON POSITION, WHEN THE WIPER SW IS TURNED FURTHER, THE CURRENT FLOWING TO TERMINAL 2 OF THE WASHER MOTOR FLOWS TO TERMINAL 3 OF THE MOTOR → TERMINAL 2 OF THE REAR WIPER AND WASHER SW → TERMINAL 16 → TO GROUND, SO THAT THE WASHER MOTOR ROTATES AND THE WINDOW WASHER EJECTS THE SPRAY, ONLY WHILE THE SWITCH IS FULLY TURNED.
WHEN THE WIPER SW IS OFF AND THEN TURNED TO WASHER ON (WIPER OFF SIDE), ONLY THE WASHER OPERATES.

SYSTEM OUTLINE

W 1 WASHER MOTOR
2–GROUND : APPROX. 12 VOLTS WITH IGNITION SW AT ON POSITION
3–GROUND : CONTINUOUS WITH WASHER SW TURNED ON

R15 REAR WIPER MOTOR AND RELAY
1–GROUND : APPROX. 12 VOLTS WITH IGNITION SW AT ON POSITION
2–GROUND : CONTINUOUS WITH REAR WIPER SW AT INT POSITION
3–GROUND : CONTINUOUS WITH REAR WIPER SW AT ON POSITION

: PARTS LOCATION

CODE   SEE PAGE   CODE   SEE PAGE   CODE   SEE PAGE
C14   28
R15   30         W 1   25 (2JZ–GTE)
                       27 (2JZ–GE)

: JUNCTION BLOCK AND WIRE HARNESS CONNECTOR

CODE   SEE PAGE   JUNCTION BLOCK AND WIRE HARNESS (CONNECTOR LOCATION)
1A   20   ENGINE ROOM MAIN WIRE AND J/B NO. 1 (LEFT KICK PANEL)
1H
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)
IB2   36   ENGINE ROOM MAIN WIRE AND COWL WIRE (LEFT KICK PANEL)
IC2   36   FLOOR NO. 2 WIRE AND COWL WIRE (LEFT KICK PANEL)
BM1   40   BACK DOOR NO. 1 WIRE AND FLOOR NO. 2 WIRE (LEFT SIDE OF PACKAGE TRAY TRIM)
BO1   40   BACK DOOR NO. 2 WIRE AND BACK DOOR NO. 1 WIRE (BACK DOOR UPPER LEFT)

: GROUND POINTS

CODE   SEE PAGE   GROUND POINTS LOCATION
IE   36   LEFT KICK PANEL

: SPLICE POINTS

CODE   SEE PAGE   WIRE HARNESS WITH SPLICE POINTS   CODE   SEE PAGE   WIRE HARNESS WITH SPLICE POINTS
E 9   32   ENGINE ROOM MAIN WIRE   E21   34   ENGINE ROOM MAIN WIRE

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