Lexus ES300 (2002 year). Service manual — part 6
120
Light Auto Turn Off
1
120A
ALT
1
2E
1
2
3
1
5
2
40A
MAIN
1
5
2
3
10A
ECU–B
From Power Source System (See Page 56)
10A
ECU–IG
5A
ECU–ACC
OFF
Tail
Head
AUTO
Li
ght
C
ont
ro
l S
W
A
8
A
9
B
14
A
IB
A
16
14
13
12
TAIL
Relay
HEAD
Relay
14
15
1
9
10
TAIL
HEAD
AUTO
2R
8
2B
11
12
24
GND
SGND
Combination SW
C11
IA
ID
Junction
Connector
J 4
TRLY
HRLY
B
SIG
ACC
1
B–
G
B–
G
R
R–
Y
W
W–
B
BR
W–
B
B–
G
W–B
Body ECU
B 4(A), B 5(B), B 6(C)
FL MAIN
3. 0W
Battery
1
2
C
1
DCTY
R–
G
IA2
6
1
D
oor
C
o
u
rte
sy
S
W
F
ron
t LH
D 8
R–
G
1H
11
2F
3
R–
B
121
1. Normal Lighting Operation
<Turn taillight on>
With the light control SW turned to TAIL position, a signal is input into TERMINAL (A) 8 of the body ECU. Due to this signal,
the current flowing to TERMINAL 14 of the ECU flows to TERMINAL (A) 8 to TERMINAL 14 of the light control SW to
TERMINAL 16 to GROUND, and TAIL 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) 8 and (A) 9 of the body ECU. Due to
this signal, the current flowing to TERMINAL 15 of the ECU flows to TERMINAL (A) 9 to TERMINAL 13 of the light control
SW to TERMINAL 16 to GROUND in the headlight circuit, and causes taillight and HEAD 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 9 of the ECU), when the driver’s door is opened
(Input signal goes to TERMINAL (C) 1 of the ECU), the body ECU operates and the current is cut off which flows from
TERMINAL 14 of the ECU to TERMINAL (A) 8 In taillight circuit and from TERMINAL 15 to TERMINAL (A) 9 in headlight
circuit.
As a result, all lights are turned off automatically.
TAIL Relay
5–3 : Closed with the light control SW at HEAD or TAIL position
HEAD Relay (w/ Daytime Running Light)
5–3 : Closed with the light control SW at HEAD position or dimmer SW at FLASH position
Closed with the engine running and parking brake released (Parking brake SW off)
HEAD Relay (w/o Daytime Running Light)
5–3 : Closed with the light control SW at HEAD position or dimmer SW at FLASH position
Body ECU
9–Ground : Approx. 12 volts with ignition SW at ON or ST position
12, 24–Ground : Always continuity
1–Ground : Always approx. 12 volts
D8 Door Courtesy SW Front LH
1–Ground : Closed with the driver door open
: Parts Location
Code
See Page
Code
See Page
Code
See Page
B4
A
B6
C
D8
B5
B
C11
J4
: Relay Blocks
Code
See Page
Relay Blocks (Relay Block Location)
1
Engine Room R/B (Engine Compartment Left)
: Junction Block and Wire Harness Connector
Code
See Page
Junction Block and Wire Harness (Connector Location)
1H
Engine Room Main Wire and Engine Room J/B (Engine Compartment Left)
2B
Instrument Panel Wire and Driver Side J/B (Lower Finish Panel)
2E
Engine Room Main Wire and Driver Side J/B (Lower Finish Panel)
2F
Engine Room Main Wire and Driver Side J/B (Lower Finish Panel)
2R
Instrument Panel Wire and Driver Side J/B (Lower Finish Panel)
: Connector Joining Wire Harness and Wire Harness
Code
See Page
Joining Wire Harness and Wire Harness (Connector Location)
IA2
Instrument Panel Wire and Floor No.1 Wire (Left Kick Panel)
System Outline
Service Hints
122
Light Auto Turn Off
: Ground Points
Code
See Page
Ground Points Location
IA
Instrument Panel Reinforcement LH
IB
Instrument Panel Brace LH
ID
Instrument Panel Brace RH
124
Automatic Light Control
1
120A
ALT
1
2E
1
2
3
1
5
2
40A
MAIN
1
5
2
3
10A
ECU–B
From Power Source System (See Page 56)
10A
ECU–IG
5A
ECU–ACC
OFF
Tail
Head
AUTO
Li
ght
C
ont
ro
l S
W
A
8
A
9
B
14
A
IB
A
16
14
13
12
B
15
B
16
B
17
TAIL
Relay
HEAD
Relay
14
15
1
9
10
TAIL
HEAD
AUTO
CLTB
CLTE
CLTS
2R
8
2B
11
12
24
GND
SGND
6
3
5
Combination SW
C11
Automatic Light Control
Sensor
A18
IA
ID
Junction
Connector
J 4
TRLY
HRLY
B
SIG
ACC
1
B–
G
B–
G
R
R–
Y
W
V–
Y
GR
–
R
P–
L
W–
B
BR
W–
B
B–
G
W–B
CLTB
CLTE
CLTS
Body ECU
B 4(A), B 5(B)
FL MAIN
3. 0W
Battery
1
2
2F
3
1H
11
R–
B
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