Normal Lighting Operation; Light Auto Turn Off Operation - Toyota 1993 MR2 Wiring Diagrams

SYSTEM OUTLINE
WITH THE IGNITION SW TURNED ON, THE CURRENT FLOWS TO TERMINAL (A) 4 (CANADA), (F) 4 (USA) OF THE RETRACT CONTROL
REALY THROUGH ECU–IG FUSE.
VOLTAGE IS APPLIED AT ALL TIMES TO TERMINAL (A) 2 (CANADA), (F) 2 (USA) OF THE RETRACT CONTROL REALY. THROUGH THE
TAILLIGHT RELAY COIL, AND TO TERMINAL (A) 10 (CANADA), (F) 10 (USA) THROUGH THE HEADLIGHT RELAY COIL.

1. NORMAL LIGHTING OPERATION

<TURN TAILLIGHT ON>
WITH LIGHT CONTROL SW TURNED TO TAILLIGHT POSITION, A SIGNAL IS INPUT INTO TERMINAL (A) 13 (CANADA), (F) 13 (USA) OF
THE RETRACT CONTROL RELAY. ACCORDING TO THIS SIGNAL, THE CURRENT FLOWING TO TERMINAL (A) 2 (CANADA), (F) 2 (USA)
OF THE RELAY FLOWS FROM TERMINAL (A) 18 (CANADA), (F) 18 (USA)
TO TURN ON.
<TURN HEADLIGHT ON>
WITH LIGHT CONTROL SW TURNED TO HEADLIGHT POSITION, A SIGNAL IS INPUT INTO TERMINALS (A) 13 (CANADA), (F) 13 (USA)
AND (A) 14 (CANADA), (F) 14 (USA) OF THE RETRACT CONTROL REALY. ACCORDING TO THIS SIGNAL, THE CURRENT FLOWING TO
TERMINAL (A) 10 (CANADA), (F) 10 (USA) OF THE RELAY FLOWS TO TERMINAL (A) 18 (CANADA), (F) 18 (USA)
HEADLIGHT CIRCUIT, AND CAUSES TAILLIGHT AND HEADLIGHT RELAY TO TURN THE LIGHT ON. THE TAILLIGHT CIRCUIT IS SAME
AS ABOVE.

2. LIGHT AUTO TURN OFF OPERATION

WITH LIGHTS ON AND IGNITION SW TURNED OFF (INPUT SIGNAL GOES TO TERMINAL (A) 4 (CANADA), (F) 4 (USA) OF THE RELAY),
WHEN DOOR ON DRIVER'S SIDE IS OPENED (INPUT SIGNAL GOES TO TERMINAL (A) 15 (CANADA), (F) 15 (USA) OF THE RELAY), THE
RELAY OPERATES AND THE CURRENT IS CUT OFF WHICH FLOWS FROM TERMINAL (A) 2 (CANADA), (F) 2 (USA) OF THE RELAY TO
TERMINAL (A) 18 (CANADA), (F) 18 (USA) IN TAILLIGHT CIRCUIT AND FROM TERMINAL (A) 10 (CANADA), (F) 10 (USA) TO TERMINAL
(A) 18 (CANADA), (F) 18 (USA) IN THE HEADLIGHT CIRCUIT.
AS A RESULT, ALL LIGHTS ARE TURNED OFF AUTOMATICSLLY.
SERVICE HINTS
LIGHT RETAINER RELAY [RETRACT CONTROL RELAY] (USA)
R20 (A)
(A) 4–GROUND : APPROX. 12 VOLTS WITH IGNITION SW AT ON POSITION
(A) 2–GROUND : ALWAYS APPROX. 12 VOLTS
(A)10–GROUND : ALWAYS APPROX. 12 VOLTS
(A)15–GROUND : CONTINUITY WITH DRIVER'S DOOR OPEN
(A)18–GROUND : ALWAYS CONTINUITY
(A)13–GROUND : CONTINUITY WITH LIGHT CONTROL SW AT TAIL OR HEAD POSITION
(A)14–GROUND : CONTINUITY WITH LIGHT CONTROL SW AT HEAD POSITION
(A)17–GROUND : APPROX. 12 VOLTS WITH LIGHT CONTROL SW AT HEAD POSITION, DIMMER SW AT LOW POSITION AND FOG
LIGHT SW ON
LIGHT RETAINER RELAY [RETRACT CONTROL RELAY] (CANADA)
R20 (C), R21(B)
(C) 4–GROUND : APPROX. 12 VOLTS WITH IGNITION SW AT ON POSITION
(C) 2–GROUND : ALWAYS APPROX. 12 VOLTS
(C)10–GROUND : ALWAYS APPROX. 12 VOLTS
(C)15–GROUND : CONTINUITY WITH DRIVER'S DOOR OPEN
(C)18–GROUND : ALWAYS CONTINUITY
(C)13–GROUND : CONTINUITY WITH LIGHT CONTROL SW AT TAIL OR HEAD POSITION
(C)14–GROUND : CONTINUITY WITH LIGHT CONTROL SW AT HEAD POSITION
(B) 1–GROUND : CONTINUITY WITH FOG LIGHT SW ON
(B) 2–GROUND : ALWAYS APPROX. 12 VOLTS
TO GROUND AND TAILLIGHT RELAY CAUSES TAILLIGHT
TO GROUND IN THE
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