Lexus ES300 (2002 year). Manual — part 19
176
ABS
10A
ECU–IG
2G
21
From Power Source System (See Page 56)
1G
ID1
13
2
1
ID1
3
IF4
8
2
1
IF4
9
IO5
14
IO5
15
1
2
1
2
2G
11
2G
23
15A
STOP
2G
13
IF4
21
3B
52
3B
42
2G
7
2G
19
L
L
Y–
R
W
G–
W
G–
W
W
P–
B
LG
–
B
P–
B
R
G
P
L
R
G
P
L
P
L
B
W
Y
BR
R–
W
R–
W
25
23
1
10
14
16
14
13
11
12
33
34
30
31
8
9
18
Data Link Connector 3
D 2
Skid Control ECU with Actuator
S 1
ABS Speed Sensor
Rear LH
A36
ABS Speed Sensor
Rear RH
A37
ABS Speed Sensor
Front RH
A 7
ABS Speed Sensor
Front LH
A 6
W
3B
51
3B
41
TS
TC
1
2
1
2
40A
ABS
NO. 3
2
40A
ABS
NO. 2
1
1
1E
7
IF7
LG
–B
15
SIL
W
7
18 2G
3 2L
2L
4
2P
4
W
W
S
top
Li
g
h
t S
W
S1
3
P
a
rk
ing B
rak
e S
W
P 5
H
e
a
d
lig
h
t B
eam
Lev
el
Co
n
tr
o
l E
C
U
H1
4
IF8
3
20
G
R
–R
G
R
–R
26
SPDR
(*1
)
(*1
)
7
5
FL–
FL+
FR–
FR+
RL+
RL–
RR+
RR–
PKB
+BM
+BS
IG1
STP
TS
D/G
TC
FRO
177
10A
GAUGE2
2B
6
A
6
B
17
B
10
IF7
12
IF4
10
IF7
13
EA
EB
From Power Source System (See Page 56)
R–
L
R–
B
R–
Y
L–
W
R–
B
L–
O
L–
W
W
R–
Y
W–
B
W–
B
W–
B
W–
B
13
32
2
24
Combination Meter
C 7(A), C 8(B)
* 1 : w/ Headlight Beam Level Control System
3B
65
3B
55
3B
76
3B
66
3A
57
3A
87
40 A
W
E 1
E 1
P
N
10A
GAUGE1
2M
1
W
IL2
3
W
A
37
W
A
36
110 3A
3A
90
99 3B
3B
89
A
32
IF4
22
L–
O
W
26
A
/T
I
ndi
c
a
to
r
L
ight
S
W
A 4
R
G–
W
R–
L
R
G–
W
5
1
3
IL1
19
IL1
18
W
W
L–W
5
W
A
21
BR
W
54 3A
3A
64
BR
ID
W–B
Power
ABS
BR
AKE
Skid Control ECU
with Actuator
S 1
Micro Computer
GND1
GND2
PN
WA
SP1
BRL
178
ABS
This system controls the respective brake fluid pressures acting on the disc brake cylinders of the right front wheel, left front
wheel and rear wheels when the brakes are applied in a panic stop so that the wheels do not lock. This results in improved
directional stability and steerability during panic braking.
1. Input Signals
(1) Speed sensor signal
The speed of the wheels is detected and input to TERMINALS 9, 11, 31 and 33 of the skid control ECU with actuator.
(2) Stop light SW signal
A signal is input to TERMINAL 10 of the skid control ECU with actuator when the brake pedal is depressed.
2. System Operation
During sudden braking the skid control ECU with actuator has signals input from each sensor, which controls the current to
the solenoid inside the actuator and lets the hydraulic pressure acting on each wheel cylinder escape to the reservoir. The
pump inside the actuator is also operating at this time and it returns the brake fluid from the reservoir to the master cylinder,
thus preventing locking of the vehicle wheels.
If the skid control ECU with actuator judges that the hydraulic pressure acting on the wheel cylinder is insufficient, the current
on the solenoid is controlled and the hydraulic pressure is increased. Holding of the hydraulic pressure is also controlled by
the skid control ECU with actuator, by the same method as above. Pressure reduction, holding and increase are repeated to
maintain vehicle stability and to improve steerability during sudden braking.
A6, A7 ABS Speed Sensor Front LH, RH
2–1 : Approx. 2.3 k
Ω
A36, A37 ABS Speed Sensor Rear LH, RH
2–1 : Approx. 1.6 k
Ω
S1 Skid Control ECU with Actuator
2, 24–Ground : Always continuity
25–Ground : Approx. 12 volts with the ignition SW at ON position
10–Ground : Approx. 12 volts with the brake pedal depressed
1, 23–Ground : Always approx. 12 volts
: Parts Location
Code
See Page
Code
See Page
Code
See Page
A4
A37
H14
A6
C7
A
P5
A7
C8
B
S1
A36
D2
S13
: Junction Block and Wire Harness Connector
Code
See Page
Junction Block and Wire Harness (Connector Location)
1E
Engine Room Main Wire and Engine Room J/B (Engine Compartment Left)
1G
Engine Room Main Wire and Engine Room J/B (Engine Compartment Left)
2B
Instrument Panel Wire and Driver Side J/B (Lower Finish Panel)
2G
Engine Room Main Wire and Driver Side J/B (Lower Finish Panel)
2L
2M
Instrument Panel Wire and Driver Side J/B (Lower Finish Panel)
2P
(
)
3A
Instrument Panel Wire and Passenger Side J/B (Instrument Panel Brace RH)
3B
Instrument Panel Wire and Passenger Side J/B (Instrument Panel Brace RH)
System Outline
Service Hints
179
: Connector Joining Wire Harness and Wire Harness
Code
See Page
Joining Wire Harness and Wire Harness (Connector Location)
ID1
Engine Room Main Wire and Floor No.1 Wire (Left Side of Driver Side J/B)
IF4
IF7
Engine Room Main Wire and Instrument Panel Wire (Right Side of Steering Column Tube)
IF8
g
( g
g
)
IL1
Engine Wire and Instrument Panel Wire (Behind the Glove Box)
IL2
Engine Wire and Instrument Panel Wire (Behind the Glove Box)
IO5
Instrument Panel Wire and Floor No.2 Wire (Right Kick Panel)
: Ground Points
Code
See Page
Ground Points Location
EA
Right Fender
EB
Right Fender
ID
Instrument Panel Brace RH
: Splice Points
Code
See Page
Wire Harness with Splice Points
Code
See Page
Wire Harness with Splice Points
E1
Engine Room Main Wire
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