Toyota 1993 MR2 Wiring Diagrams page 87

HEADLIGHT AND FOG LIGHT (FOR CANADA)
SYSTEM OUTLINE
CURRENT FROM THE BATTERY FLOWS CONTINOUSLY FROM FL 2.0L
TERMINAL RT OF THE RETRACT CONTROL RELAY, FL 2.0L
RDRL OF RETRACT CONTROL RELAY.
WHEN THE IGNITION SW IS TURNED ON, THE CURRENT FLOWING THROUGH THE GAUGE FUSE TO TERMINAL IG OF THE RETRACT
CONTROL RELAY.
DAYTIME RUNNING LIGHT OPERATION
WHEN THE ENGINE IS STARTED, VOLTAGE IS GENERATED AT TERMINAL "L" OF THE ALTERNATOR AND VOLTAGE IS APPLIED TO
TERMINAL "L" OF THE RETRACT CONTROL RELAY.
IF THE PARKING BRAKE LEVER IS PULLED UP (PARKING BRAKE SW ON) AT THIS TIME, THE RELAY IS NOT ENERGIZED, SO THE
DAYTIME RUNNING LIGHTS SYSTEM DOSE NOT OPERATE.
IF THE PARKING BRAKE LEVER IS THEN RELEASED (PARKING BRAKE SW OFF), THE SIGNAL IS INPUT TO TERMINAL 'PKB' OF THE
RELAY.
THIS ACTIVATES THE RELAY AND CURRENT FROM ALT FUSE FLOWS TO TAILLIGHT RELAY (POINT SIDE)
LICENCE AND FRONT CLEARANCE LIGHTS, ETC.
ALSO, CURRENT FROM ALT FUSE FLOWS TO FOG FUSE
TAIL AND FOG LIGHTS LIGHT UP. THIS IS HOW THE DAYTIME RUNNING LIGHTS SYSTEM OPERATES AND TAIL, FOG LIGHT HAVE
LIGHTED UP, THE TAIL AND FOG LIGHT REMAIN ON EVEN IF THE PARKING BRAKE LEVER IS PULLED UP (PARKING BRAKE SW ON).
EVEN IF THE ENGINE STALLS WITH THE IGNITION SW ON AND THERE IS NO VOLTAGE FROM TERMINAL 'L' OF ALTERNATOR, THE
TAIL AND FOG LIGHTS REMAIN ON.
IF THE IGNITION SW IS THEN TURNED OFF, THE TAIL AND FOG LIGHTS ARE TURNED OFF.
IF THE ENGINE IS STARTED WHILE THE PARKING BRAKE IS RELEASED (PARKING BRAKE SW OFF), THE DAYTIME RUNNING LIGHTS
SYSTEM OPERATES AND THE TAIL AND FOG LIGHTS LIGHT UP AS THE ENGINE STARTS.
SERVICE HINTS
RETRACT CONTROL RELAY
R20, R21
RT, PB, RL–GROUND: ALWAYS APPROX. 12VOLTS
IG–GROUND:0 VOLTS WITH IGNITION SW AT LOCK OR ACC POSITION
HLD–GROUND:NO CONTINUITY WITH LIGHT CONTOL SW AT OFF OR HEAD POSITION
T–GROUND:NO CONTINUITY WITH LIGHT CONTOL SW AT OFF OR HOLD POSITION
H–GROUND:NO CONTINUITY WITH LIGHT CONTOL SW AT OFF, HOLD OR TAIL POSITION
GND–GROUND:ALWAYS CONTINUITY
LSL–SDWN, LSR–SDWN:NO CONTINUITY WITH RETRACT MOTOR AT LOWERMOST POSITION
LSR–SUP, LSL–SUP:NO CONTINUITY WITH RETRACT MOTOR AT UPPERMOST POSITION
PKB–GROUND:CONTINUITY WITH PARKING BRAKE LEVER PULLED UP (PARKING BRAKE SW ON)
RETRACT MOTOR
R22, R23
2–3:OPEN WITH RETRACT MOTOR AT LOWERMOST POSITION
2–1:OPEN WITH RETRACT MOTOR AT UPPERMOST POSITION
LIGHT AUTO TURN OFF OPERATION
PLEASE REFER TO THE LIGHT AUTO TURN OFF SYSTEM (SEE PAGE 74)
C15 DIMMER SW [COMB. SW]
9–12:CLOSED WITH DIMMER SW AT HIGH OR FLASH POSITION
: PARTS LOCATION
CODE SEE PAGE
C11 B 26
C12 A 26
C14 B 26
C15 A 26
F 3 26
: RELAY BLOCKS
CODE SEE PAGE
1 20
5 21
92
GROUND.
12VOLTS WITH IGNITION SW ON
CONTINUITY WITH LIGHT CONTROL SW AT HOLD OR TAIL POSITION
CONTINUITY WITH LIGHT CONTOL SW AT TAIL OR HEAD POSITION
CONTINUITY WITH LIGHT CONTROL SW AT HEAD POSITION OR DIMMER SW AT FLASH POSITION
CONTINUITY WITH RETRACT MOTOR AT ANY POSITION EXCEPT LOWERMOST POSITION
CONTINUITY WITH RETRACT MOTOR AT ANY POSITION EXCEPT UPPERRMOST POSITION
CODE
F 6
F 7
H 2
H 3
J 3
RELAY BLOCKS (RELAY BLOCK LOCATION)
R/B NO. 1 (LEFT KICK PANEL)
R/B NO. 5 (FRONT LUGGAGE COMPARTMENT RIGHT)
ALT FUSE AM1 FUSE
ALT FUSE AM1 FUSE
FOG LIGHT RELAY (POINT SIDE)
SEE PAGE
27
27
27
27
26
TALLIGHT RELAY (COIL SIDE)
FOGLIGHT RELAY (COIL SIDE)
TAIL FUSE
FOG LIGHTS GROUND, SO BOTH
CODE
P 1 26
R20 A 27
R21 B 27
R22 27
R23 27
TERMINAL
TAIL,
SEE PAGE