1997 TOYOTA SUPRA engine

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Page 1084 of 1807

TOYOTA SUPRA 1997 Service Repair Manual 95
HEADLIGHT RELAY
2-1 : CLOSED WITH THE LIGHT CONTROL SW AT HEAD POSITION OR THE DIMMER SW AT FLASH POSITION
C13 LIGHT CONTROL SW [COMB. SW]
13-1 1 : CLOSED WITH THE LIGHT CONTROL SW AT HEAD POSITION

Page 1088 of 1807

TOYOTA SUPRA 1997 Service Repair Manual 99
VOLTAGE IS ALWAYS APPLIED FROM THE MAIN FUSE, THROUGH THE HEADLIGHT RELAY (COIL SIDE) TO
TERMINAL 5 OF THE DAYTIME RUNNING LIGHT RELAY (MAIN), TERMINAL 6 OF THE INTEGRATION RELAY,
TERMINAL 14 OF TH

99
VOLTAGE IS ALWAYS APPLIED FROM THE MAIN FUSE, THROUGH THE HEADLIGHT RELAY (COIL SIDE) TO
TERMINAL 5 OF THE DAYTIME RUNNING LIGHT RELAY (MAIN), TERMINAL 6 OF THE INTEGRATION RELAY,
TERMINAL 14 OF THE DIMMER SW, DIMMER RELAY (DAYTIME RUNNING LIGHT RELAY NO. 2) (COIL SIDE), TO
TERMINAL 17 OF THE DAYTIME RUNNING LIGHT RELAY (MAIN). WHEN THE IGNITION SW IS TURNED ON, VOLTAGE
FROM THE GAUGE FUSE IS APPLIED TO TERMINAL 2 OF THE DAYTIME RUNNING LIGHT RELAY (MAIN).
1. DAYTIME RUNNING LIGHT OPERATION
WHEN THE ENGINE STARTS, VOLTAGE FROM TERMINAL `L' OF THE GENERATOR IS APPLIED TO TERMINAL 11 OF
THE DAYTIME RUNNING LIGHT RELAY (MAIN). IF THE PARKING BRAKE LEVER IS PULLED UP (PARKING BRAKE SW
ON) AT THIS TIME, THE DAYTIME RUNNING LIGHT SYSTEM DOES NOT OPERATE. WHEN THE PARKING BRAKE IS
RELEASED (PARKING BRAKE SW OFF), A SIGNAL IS OUTPUT FROM TERMINAL 1 OF THE PARKING BRAKE SW TO
TERMINAL 8 OF THE DAYTIME RUNNING LIGHT RELAY (MAIN). THIS ACTIVATES THE DAYTIME RUNNING LIGHT
RELAY (MAIN), TURNING ON THE DIMMER RELAY (DAYTIME RUNNING LIGHT RELAY NO. 2). CURRENT ALSO FLOWS
FROM THE MAIN FUSE TO THE DIMMER RELAY (DAYTIME RUNNING LIGHT RELAY NO. 2) (POINT SIDE) " HEAD
(LH-UPR) FUSE " HEADLIGHT HI LH " HEADLIGHT HI RH " TERMINAL (A)5 OF THE DAYTIME RUNNING LIGHT
RELAY NO. 3 " TERMINAL (A)3 " GROUND, CAUSING THE HEADLIGHTS TO LIGHT UP AT APPROX. 20% OF THEIR
NORMAL BRIGHTNESS.
ONCE THE DAYTIME RUNNING LIGHT RELAY (MAIN) HAS BEEN ACTIVATED AND THE HEADLIGHTS LIGHT UP, THE
HEADLIGHTS REMAIN ON EVEN IF THE PARKING BRAKE LEVER IS ENGAGED AGAIN (PARKING BRAKE SW ON).
2. HEADLIGHT OPERATION
WHEN THE LIGHT CONTROL SW IS AT HEAD POSITION AND THE DIMMER SW AT LOW POSITION, CURRENT FLOWS
FROM THE HEADLIGHT RELAY (COIL SIDE) TO TERMINAL 3 OF THE INTEGRATION RELAY " TERMINAL 4 "
TERMINAL 13 OF THE LIGHT CONTROL SW " TERMINAL 11 " GROUND, ACTIVATING THE HEADLIGHT RELAY.
THIS CAUSES THE CURRENT TO FLOW FROM THE HEADLIGHT RELAY (POINT SIDE) TO THE HEAD LWR FUSE "
HEADLIGHT LO " GROUND, CAUSING THE HEADLIGHTS TO LIGHT UP AT NORMAL BRIGHTNESS. SIMUTANEOUSLY,
CURRENT FLOWS FROM THE DRL FUSE " DAYTIME RUNNING LIGHT RELAY NO. 3 (COIL SIDE) " GROUND,
ACTIVATING RELAY NO. 3.
WHEN THE DIMMER SW IS AT HIGH POSITION, TERMINAL 12 OF THE DIMMER SW OUTPUTS A SIGNAL TO
TERMINAL 16 OF THE DAYTIME RUNNING LIGHT RELAY (MAIN) TO ACTIVATE IT. THIS TURNS ON DIMMER RELAY
(DAYTIME RUNNING LIGHT RELAY NO. 2). SO CURRENT FLOWS FROM THE DIMMER RELAY (DAYTIME RUNNING
LIGHT RELAY NO. 2) (POINT SIDE) TO THE HEAD (LH-UPR) FUSE " HEADLIGHT HI LH " DAYTIME RUNNING LIGHT
NO. 3 (POINT SIDE) " GROUND, AND FROM THE HEAD (RH-UPR) FUSE " DAYTIME RUNNING LIGHT RELAY NO. 3
(POINT SIDE) " HEADLIGHT HI RH " DAYTIME RUNNING LIGHT RELAY NO. 3 (POINT SIDE) " GROUND, CAUSING
THE HEADLIGHTS TO OPERATE AT HI.
WHEN THE DIMMER SW IS AT FLASH POSITION, CURRENT FROM THE HEADLIGHT RELAY (COIL SIDE) FLOWS TO
TERMINAL 14 OF THE DIMMER SW " TERMINAL 9 " GROUND, ACTIVATING THE RELAY. SIMULTANEOUSLY,
CURRENT FROM THE HEADLIGHT RELAY (POINT SIDE) FLOWS TO HEADLIGHT LO, LIGHTING UP HEADLIGHT LO
AND ACTIVATING DAYTIME RUNNING LIGHT RELAY NO. 3. THEN TERMINAL 12 OF THE DIMMER SW OUTPUTS A
SIGNAL TO TERMINAL 16 OF THE DAYTIME RUNNING LIGHT RELAY (MAIN), ACTIVATING THE DAYTIME RUNNING
LIGHT RELAY (MAIN) SO THAT CURRNET FLOWS TO HEADLIGHT HI LIKE IT DOES FOR HIGH POSITION. THIS
CAUSES ALL HEADLIGHTS TO LIGHT UP.
D6 DAYTIME RUNNING LIGHT RELAY (MAIN)
15-GROUND : ALWAYS APPROX. 12 VOLTS
2-GROUND : APPROX. 12 VOLTS WITH TEH IGNITION SW AT ON POSITION
13-GROUND : ALWAYS CONTINUITY
5-GROUND : APPROX. 12 VOLTS WITH THE DAYTIME RUNNING LIGHT SYSTEM
DOES NOT OPERATE OR THE LIGHT CONTROL SW AT OFF OR TAIL POSITION
(WHEN THE CONNECTOR IS DISCONNECTED, ALWAYS APPROX. 12 VOLTS)
8-GROUND : CONTINUITY WITH THE PARKING BRAKE LEVER RELEASED
SYSTEM OUTLINE
SERVICE HINTS

Page 1089 of 1807

TOYOTA SUPRA 1997 Service Repair Manual 100
HEADLIGHT (CANADA)
: PARTS LOCATION
CODESEE PAGECODESEE PAGECODESEE PAGE
B224 (2JZ-GTE)D628H424 (2JZ-GTE)
C1228G224 (2JZ-GTE)I2029
C1328H124 (2JZ-GTE)P529
D2A24H224 (2JZ-GTE)
D3B24H324 (2JZ-GTE)
:

Page 1093 of 1807

TOYOTA SUPRA 1997 Service Repair Manual 104
TAILLIGHT
WHEN THE LIGHT CONTROL SW IS TURNED TO TAIL OR HEAD POSITION. THE CURRENT FLOWS TO TERMINAL 3
OF THE LIGHT FAILURE SENSOR THROUGH THE TAIL FUSE.
WHEN THE IGNITION SW IS TURNED ON, THE CU

104
TAILLIGHT
WHEN THE LIGHT CONTROL SW IS TURNED TO TAIL OR HEAD POSITION. THE CURRENT FLOWS TO TERMINAL 3
OF THE LIGHT FAILURE SENSOR THROUGH THE TAIL FUSE.
WHEN THE IGNITION SW IS TURNED ON, THE 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.
TAILLIGHT DISCONNECTION WARNING
WITH THE IGNITION SW ON AND THE LIGHT CONTROL SW TURNED TO TAIL OR HEAD POSITION, IF THE TAILLIGHT
CIRCUIT IS OPEN, THE LIGHT FAILURE SENSOR DETECTS THE FAILURE BY THE CHANGE IN CURRENT FLOWING
FROM TERMINAL 3 OF THE LIGHT FAILURE SENSOR TO TERMINAL 9, 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, WHICH REMAINS ON UNTIL THE LIGHT CONTROL SW
IS TURNED OFF.
TAILLIGHT RELAY
5-3 : CLOSED WITH THE LIGHT CONTROL SW AT TAIL OR HEAD POSITION
L2 LIGHT FAILURE SENSOR
4,8-GROUND : APPROX. 12 VOLTS WITH THE IGNITION SW AT ON POSITION
3-GROUND : APPROX. 12 VOLTS WITH THE LIGHT CONTROL SW AT TAIL OR HEAD POSITION
11-GROUND : ALWAYS CONTINUITY
: PARTS LOCATION
CODESEE PAGECODESEE PAGECODESEE PAGE
C1328F826 (2JZ-GE)R930
F524 (2JZ-GTE)I2029R1030F526 (2JZ-GE)L130R1130
F624 (2JZ-GTE)L230R1230F626 (2JZ-GE)P1324 (2JZ-GTE)T629
F824 (2JZ-GTE)P1326 (2JZ-GE)
: RELAY BLOCKS
CODESEE PAGERELAY BLOCKS (RELAY BLOCK LOCATION)
222R/B NO. 2 (ENGINE COMPARTMENT LEFT)
: JUNCTION BLOCK AND WIRE HARNESS CONNECTOR
CODESEE PAGEJUNCTION BLOCK AND WIRE HARNESS (CONNECTOR LOCATION)
1A20ENGINE ROOM MAIN WIRE AND J/B NO 1 (LEFT KICK PANEL)1B20ENGINE ROOM MAIN WIRE AND J/B NO. 1 (LEFT KICK PANEL)
1C20FLOOR NO. 2 WIRE AND J/B NO. 1 (LEFT KICK PANEL)
1E20INSTRUMENT PANEL WIRE AND J/B NO. 1
1J20COWL WIRE AND J/B NO 1 (LEFT KICK PANEL)1K20COWL WIRE AND J/B NO. 1 (LEFT KICK PANEL)
2A22BATTERY AND J/B NO. 2 (ENGINE COMPARTMENT LEFT)
: CONNECTOR JOINING WIRE HARNESS AND WIRE HARNESS
CODESEE PAGEJOINING WIRE HARNESS AND WIRE HARNESS (CONNECTOR LOCATION)
IE136INSTRUMENT PANEL WIRE AND FLOOR NO. 2 WIRE (LEFT KICK PANEL)
SYSTEM OUTLINE
SERVICE HINTS

Page 1094 of 1807

TOYOTA SUPRA 1997 Service Repair Manual 105
: GROUND POINTS
CODESEE PAGEGROUND POINTS LOCATION
EA32 (2JZ-GTE)FRONT SIDE OF RIGHT FENDEREA34 (2JZ-GE)FRONT SIDE OF RIGHT FENDER
EB32 (2JZ-GTE)FRONT SIDE OF LEFT FENDEREB34 (2JZ-GE)FRONT SIDE OF

Page 1096 of 1807

TOYOTA SUPRA 1997 Service Repair Manual 107
FOG LIGHT RELAY
(2)3-(2)5 : CLOSED WITH THE LIGHT CONTROL SW AT HEAD POSITION, DIMMER SW AT LOW POSITION AND THE
FOG LIGHT SW ON POSITION
: PARTS LOCATION
CODESEE PAGECODESEE PAGECODESEE PAGE
C132

Page 1098 of 1807

TOYOTA SUPRA 1997 Service Repair Manual 109
WITH THE IGNITION SW TURNED ON, THE CURRENT FLOWS TO TERMINAL 7 OF THE INTEGRATION RELAY
THROUGH GAUGE FUSE. VOLTAGE IS APPLIED AT ALL TIMES TO TERMINAL (A) 2 OF THE INTEGRATION RELAY
THROUGH THE

109
WITH THE IGNITION SW TURNED ON, THE CURRENT FLOWS TO TERMINAL 7 OF THE INTEGRATION RELAY
THROUGH GAUGE FUSE. VOLTAGE IS APPLIED AT ALL TIMES TO TERMINAL (A) 2 OF THE INTEGRATION RELAY
THROUGH THE TAILLIGHT RELAY COIL SIDE, AND TO TERMINAL (A) 3 THROUGH THE HEADLIGHT RELAY COIL
SIDE.
1. NORMAL LIGHTING OPERATION

WITH THE LIGHT CONTROL SW TURNED TO TAIL POSITION, A SIGNAL IS INPUT INTO TERMINAL (A) 1 OF THE
INTEGRATION RELAY. DUE TO THIS SIGNAL, THE CURRENT FLOWING TO TERMINAL (A) 2 OF THE RELAY FLOWS TO
TERMINAL (A) 1 " TERMINAL 2 OF THE LIGHT CONTROL SW " TERMINAL 11 " TO GROUND, AND TAILLIGHT
RELAY CAUSES TAILLIGHTS TO TURN ON.

WITH THE LIGHT CONTROL SW TURNED TO HEAD POSITION, A SIGNAL IS INPUT INTO TERMINALS (A) 1 AND (A) 4
OF THE INTEGRATION RELAY. DUE TO THIS SIGNAL, THE CURRENT FLOWING TO TERMINAL (A) 3 OF THE RELAY
FLOWS TO TERMINAL (A) 4 " TERMINAL 13 OF THE LIGHT CONTROL SW " TERMINAL 11 " TO GROUND IN THE
HEADLIGHT CIRCUIT, AND CAUSES TAILLIGHT AND HEADLIGHT RELAY TO TURN THE LIGHTS ON. THE TAILLIGHT
CIRCUIT IS SAME AS ABOVE.
2. LIGHT AUTO TURN OFF OPERATION
WITH LIGHT ON AND IGNITION SW TURNED OFF (INPUT SIGNAL GOES TO TERMINAL 7 OF THE RELAY), WHEN THE
DRIVER'S DOOR IS OPENED (INPUT SIGNAL GOES TO TERMINAL 6 OF THE RELAY), THE RELAY OPERATES AND
THE CURRENT IS CUT OFF WHICH FLOWS FROM TERMINAL (A) 2 OF THE RELAY TO TERMINAL (A) 1 IN TAILLIGHT
CIRCUIT AND FROM TERMINAL (A) 3 TO TERMINAL (A) 4 IN HEADLIGHT CIRCUIT.
AS A RESULT, ALL LIGHTS ARE TURNED OFF AUTOMATICALLY.
HEADLIGHT RELAY
2-1 : CLOSED WITH THE LIGHT CONTROL SW AT HEAD POSITION OR THE DIMMER SW AT FLASH POSITION (USA)
: CLOSED WITH THE ENGINE RUNNING AND THE PARKING BRAKE LEVER RELEASED (CANADA)
TAILLIGHT RELAY
3-5 : CLOSED WITH THE LIGHT CONTROL SW AT TAIL OR HEAD POSITION
D10 DOOR COURTESY SW LH
3-2 : CLOSED WITH THE LH DOOR OPEN
I20 (A) INTEGRATION RELAY
7-GROUND : APPROX. 12 VOLTS WITH THE IGNITION SW AT ON POSITION
6-GROUND : CONTINUITY WITH THE LH DOOR OPEN
1-GROUND : ALWAYS APPROX. 12 VOLTS
(A)2-GROUND : ALWAYS APPROX. 12 VOLTS
(A)3-GROUND : ALWAYS APPROX. 12 VOLTS
(A)4-GROUND : CONTINUITY WITH THE LIGHT CONTROL SW AT HEAD POSITION
(A)1-GROUND : CONTINUITY WITH THE LIGHT CONTROL SW AT TAIL OR HEAD POSITION
: PARTS LOCATION
CODESEE PAGECODESEE PAGECODESEE PAGE
C1328D1030I20A29
: RELAY BLOCKS
CODESEE PAGERELAY BLOCKS (RELAY BLOCK LOCATION)
222R/B NO. 2 (ENGINE COMPARTMENT LEFT)
SYSTEM OUTLINE
SERVICE HINTS

Page 1099 of 1807

TOYOTA SUPRA 1997 Service Repair Manual 11 0
LIGHT AUTO TURN OFF
: JUNCTION BLOCK AND WIRE HARNESS CONNECTOR
CODESEE PAGEJUNCTION BLOCK AND WIRE HARNESS (CONNECTOR LOCATION)
1B20ENGINE ROOM MAIN WIRE AND J/B NO. 1 (LEFT KICK PANEL)
1I
1J20C

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