Toyota Supra 2015 Wiring Diagram Manual page 98

SYSTEM OUTLINE
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
<TURN TAILLIGHT ON>
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.
<TURN HEADLIGHT 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.
SERVICE HINTS
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
CODE SEE PAGE
C13 28
: RELAY BLOCKS
CODE SEE PAGE
2 22
CODE
D10
RELAY BLOCKS (RELAY BLOCK LOCATION)
R/B NO. 2 (ENGINE COMPARTMENT LEFT)
SEE PAGE
30
CODE SEE PAGE
I20 A 29
109