Lexus SC300 / Lexus SC400. Manual — part 986
2
INTRODUCTION
This manual consists of the following 11 sections:
No.
Section
Description
A
INDEX
Index of the contents of this manual.
A
INTRODUCTION
Brief explanation of each section.
B
HOW TO USE
THIS MANUAL
Instructions on how to use this manual.
C
TROUBLE–
SHOOTING
Describes the basic inspection procedures for electrical circuits.
D
ABBREVIATIONS
Defines the abbreviations used in this manual.
E
GLOSSARY OF
TERMS AND
SYMBOLS
Defines the symbols and functions of major parts.
F
RELAY LOCATIONS
Shows position of the Electronic Control Unit, Relays, Relay Block, etc.
This section is closely related to the system circuit.
G
ELECTRICAL
WIRING ROUTING
Describes position of Parts Connectors, Splice points, Ground points, etc.
This section is closely related to the system circuit.
H
POWER SOURCE
(Current Flow Chart)
Describes power distribution from the power supply to various electrical
loads.
INDEX
Index of the system circuits.
I
SYSTEM CIRCUITS
Electrical circuits of each system are shown from the power supply through
ground points. Wiring connections and their positions are shown and
classified by code according to the connection method. (Refer to the
section, “How to use this manual”).
The “System Outline” and “Service Hints” useful for troubleshooting are also
contained in this section.
J
GROUND POINTS
Shows ground positions of all parts described in this manual.
K
OVERALL
WIRING DIAGRAM
Provides circuit diagrams showing the circuit connections.
108
LIGHT AUTO TURN OFF
1K
11
2
2
1D
8
IF
1J
1
1K
5
1B
2
2
1B
5
4
4
4
B
11
A
3
A
6
B
12
1D
10
6
4
2
4
7
3
1
2
4
3
3
13
6
1
3
1
IE1
6
10A
GAUGE
10A
DOME
R–Y
W
W–
B
R–
W
W–
B
W–
B
R–
G
G–
L
W
W–
L
W
W–
G
R–
Y
R–
Y
W–
L
R
G–
W
FROM POWER SOURCE SYSTEM (SEE PAGE 56)
BATTERY
FUSE BLOCK
INTEGRATION
RELAY
TAILLIGHT
RELAY
HEADLIGHT
RELAY
FR
O
M
C
O
R
N
E
R
IN
G
L
IG
H
T
R
EL
AY
TO
D
IM
M
E
R
S
W
LI
G
H
T
C
O
NT
RO
L
S
W
D
OOR
OP
E
N
DE
T
E
CT
IO
N
S
W
L
H
120
A
A
LT
100
A
A
M
1
60
A
M
A
IN
Q
Q
S
R
R
S
OFF
TAIL
HEAD
COMBINATION SW
F 9
C15
D1
0
I16
DIODE
3
2
5
1
B
A
R–
Y
7
A
4
B
10
B
13
A
5
R–Y
(CANADA)
(USA)
(USA)
(CANADA)
2
I 5
1
10
6
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)4 (USA), (B)11 (CANADA) OF THE INTEGRATION RELAY THROUGH THE
TAILLIGHT RELAY COIL, AND TO TERMINAL (A)5 (USA), (B)12 (CANADA) 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)3 (USA), (B)10 (CANADA) OF
THE INTEGRATION RELAY. DUE TO THIS SIGNAL, THE CURRENT FLOWING TO TERMINAL (A)4 (USA), (B)11 (CANADA) OF THE RELAY
FLOWS TO TERMINAL (A)3 (USA), (B)10 (CANADA)
→
TERMINAL 3 OF THE LIGHT CONTROL SW
→
TERMINAL 4
→
TO GROUND AND
TAILLIGHT RELAY CAUSES TAILLIGHT TO TURN ON.
TURN HEADLIGHT ON
WITH LIGHT CONTROL SW TURNED TO HEADLIGHT POSITION, A SIGNAL IS INPUT INTO TERMINALS (A)3 (USA). (B)10 (CANADA)
AND (A)6 (USA), (B)13 (CANADA) OF THE INTEGRATION RELAY. DUE TO THIS SIGNAL, THE CURRENT FLOWING TO TERMINAL (A)5
(USA), (B)12 (CANADA) OF THE RELAY FLOWS TO TERMINAL (A)6 (USA), (B)13 (CANADA)
→
TERMINAL 13 OF THE LIGHT CONTROL
SW
→
TERMINAL 4
→
TO GROUND IN THE HEADLIGHT CIRCUIT, AND CAUSES TAILLIGHT AND HEADLIGHT RELAY TO TURN 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 7 OF THE RELAY), WHEN DOOR ON DRIVER’S
SIDE 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)4 (USA), (B)11 (CANADA) OF THE RELAY TO TERMINAL (A)3 (USA), (B)10 (CANADA) IN TAILLIGHT
CIRCUIT AND FROM TERMINAL (A)5 (USA), (B)12 (CANADA) TO TERMINAL (A)6 (USA), (B)13 (CANADA) IN HEADLIGHT CIRCUIT.
AS A RESULT, ALL LIGHTS ARE TURNED OFF AUTOMATICALLY.
HEADLIGHT RELAY
1–2 : CLOSED WITH LIGHT CONTROL SW AT HEAD POSITION OR DIMMER SW AT FLASH POSITION
TAILLIGHT RELAY
5–3 : CLOSED WITH LIGHT CONTROL SW AT TAIL OR HEAD POSITION
I16
(A)(B) INTEGRATION RELAY
7–GROUND : APPROX. 12 VOLTS WITH IGNITION SW AT ON POSITION
6–GROUND : CONTINUITY WITH DOOR LH OPEN
(A)4, (B)11–GROUND: ALWAYS APPROX. 12 VOLTS
(A)5, (B)12–GROUND: ALWAYS APPROX. 12 VOLTS
(A)6, (B)13–GROUND: CONTINUITY WITH LIGHT CONTROL SW AT HEAD POSITION
(A)3, (B)10–GROUND: CONTINUITY WITH LIGHT CONTROL SW AT TAIL OR HEAD POSITION
D10
DOOR LOCK MOTOR, DOOR UNLOCK DETECTION SW AND DOOR OPEN DETECTION SW LH
3–6 : CLOSED WITH DOOR LH OPEN
: PARTS LOCATION
CODE
SEE PAGE
CODE
SEE PAGE
CODE
SEE PAGE
C15
F 9
I16
B
D10
I16
A
: RELAY BLOCKS
CODE
SEE PAGE
RELAY BLOCKS (RELAY BLOCK LOCATION)
2
ENGINE COMPARTMENT LEFT
4
LEFT KICK PANEL (J/B NO.1 LEFT)
: JUNCTION BLOCK AND WIRE HARNESS CONNECTOR
CODE
SEE PAGE
JUNCTION BLOCK AND WIRE HARNESS (CONNECTOR LOCATION)
1B
ENGINE ROOM MAIN WIRE
1D
FRONT DOOR LH WIRE
1J
COWL WIRE
1K
COWL WIRE
: CONNECTOR JOINING WIRE HARNESS AND WIRE HARNESS
CODE
SEE PAGE
JOINING WIRE HARNESS AND WIRE HARNESS (CONNECTOR LOCATION)
IE1
ENGINE WIRE AND COWL WIRE (R/B NO.4)
SYSTEM OUTLINE
SERVICE HINTS
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