Lexus ES300 (1997 year). Manual — part 651
198
ABS
60A
ABS
2
FROM POWER SOURCE SYSTEM (SEE PAGE 56)
2
4
1
3
3
3
6
2
1
4
5
3
3
3
3
3
3
3
IM2
8
IK3
4
IK3
5
IK3
8
IK3
11
G–B
B
2
E 4
R–
B
W–
R
L–
B
W–
L
W–
R
R–
G
G–
Y
LG
–B
R
R–
W
M
B
7
B
18
B
8
A
9
A
11
A
8
A
4
B
4
1
B
10
B
11
B
21
B
22
B
5
B
12
B
16
B
9
B
1
B
4
A
1
A
5
A
3
A
7
A
4
A
8
A
2
A
6
B
5
B
3
G–
B
G
–
B
G–
B
R–
Y
LG
–R
LG
–
R
W–
R
GR
–
L
W–
B
W–
L
GR
GR
–
R
R–
L
LG
–
R
LG
–
R
R–
Y
R–L
GR–R
R–
L
SFRH
SFRR
SFLH
SFLR
SRRH
SRRR
SRLH
SRLR
MR
SR
R+
D/G
B
W–
B
W–
R
W–
B
W–B
W–
L
23
22
16
11
14
4
DATA LINK
D 3
JU
N
C
T
I
O
R
J
8
ABS
M
O
T
O
R
R
E
L
A
Y
AB
S S
O
L
R
E
L
A
Y
ABS ECU
B
A22
, A23
A
ABS ACTUATOR
B
A 5
, A 6
A
JUNCTION
CONNECTOR
IK3
6
B
B
A
C
A
3
A
A
BR
BR
BR
BR
3
BR
R–
Y
R–
L
R–L
J
U
NCT
IO
N CO
N
N
E
C
T
O
R
B
J
8
,
J
9
A
JUNCTION
CONNECTOR
BR
J24
B
W–B
DATA LINK
CONNECTOR 1
D 1
1
TC
TS
MT
AST
WA
TC
TS
WB
WA
(*1
)
E1
ABS
TC
CONNECTOR 2
E1
B
B
ON
C
O
N
N
E
C
T
C
C
C
J30
F
F
199
* 1 : SHORT PIN
FROM POWER SOURCE SYSTEM (SEE PAGE 56)
IJ1
12
A
2
A
12
W
G–
W
G–
W
G–
W
2
1
2
1
IM2
6
IM2
1
B
20
B
19
B
14
B
3
D
A
D
A
R–
L
B–
R
R–
L
G–
B
G
R
B
W
G
R
B–
R
G–B
IG1
FL–
FL+
FR–
FR+
A
[
C
JUNC
T
IO
N
CO
N
N
E
C
T
O
R
J 4
JUNC
T
IO
N
CO
N
N
E
C
T
O
R
J 3
ABS SPEED SENSOR
FRONT LH
A 9
ABS SPEED SENSOR
FRONT RH
A10
B
13
B
2
EA
E 1
1
2
1
2
A
3
A
10
A
1
A
7
ID1
3
ID1
9
IN1
3
IN1
9
W–
B
W–
B
W–
B
B
W
G
R
B
W
G
R
RR–
RR+
RL–
RL+
ABS SPEED SENSOR
REAR RH
A34
ABS SPEED SENSOR
REAR LH
A33
ABS ECU
B
A22
, A23
A
A
A
JU
N
C
T
ION
C
O
NNE
CT
O
R
J2
7
ED
BR
BR
W–
B
EB
W–
B
IM3
6
IM3
1
20
18
GR
–
R
GR
–
L
GR
–
R
GR
–
L
B
15
B
6
FRO
RRO
RRO
FRO
ABSORBER
CONTROL ECU
A24
GN
D
GN
D
ST
P
1
2
S
T
OP
L
IGH
T
S
W
S1
0
10A
GAUGE
1D
2
15A
ECU–IG
1J
9
15A
STOP
1C
7
B
S
W
A
R
N
IN
G
L
IGH
T
C
O
MB
.
ME
T
E
R
]
1
7
3
0
1R
4
1R
5
B
A
A
B
B
B
A
200
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 FL+, FR+, RL+ AND RR+ OF THE ABS ECU.
(2) STOP LIGHT SW SIGNAL
A SIGNAL IS INPUT TO TERMINAL STP OF THE ABS ECU WHEN BRAKE PEDAL IS OPERATED.
2. SYSTEM OPERATION
DURING SUDDEN BRAKING THE ABS ECU, WHICH HAS SIGNALS INPUT FROM EACH SENSOR, CONTROLS THE CURRENT FLOWING 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 ECU JUDGES THAT THE HYDRAULIC PRESSURE ACTING ON THE WHEEL CYLINDER IS INSUFFICIENT, THE CURRENT ACTING ON
THE SOLENOID IS CONTROLLED AND THE HYDRAULIC PRESSURE IS INCREASED. HOLDING OF THE HYDRAULIC PRESSURE IS ALSO
CONTROLLED BY THE ECU, BY THE SAME METHOD AS ABOVE. PRESSURE REDUCTION, HOLDING AND INCREASE ARE REPEATED TO
MAINTAIN VEHICLE STABILITY AND TO IMPROVE STEERABILITY DURING SUDDEN BRAKING.
A22 , A23 ABS ECU
(CONNECT THE ECU CONNECTOR)
2–GROUND : ALWAYS CONTINUITY
13–GROUND : ALWAYS CONTINUITY
2–GROUND : APPROX. 12 VOLTS WITH THE IGNITION SW AT ON POSITION
12–GROUND : APPROX. 12 VOLTS WITH THE BRAKE PEDAL DEPRESSED
A 6 ABS ACTUATOR
1–GROUND : ALWAYS CONTINUITY
S10 STOP LIGHT SW
2–1 : CLOSED WITH THE BRAKE PEDAL DEPRESSED
: PARTS LOCATION
CODE
SEE PAGE
CODE
SEE PAGE
CODE
SEE PAGE
A 5
A
26
A33
30
J 8
A
29
A 6
B
26
A34
30
J 9
B
29
A 9
26
C10
28
J24
29
A10
26
D 1
26
J27
29
A22
A
28
D 3
28
J30
29
A23
B
28
J 3
29
S10
29
A24
28
J 4
29
: RELAY BLOCKS
CODE
SEE PAGE
RELAY BLOCKS (RELAY BLOCK LOCATION)
3
23
ENGINE ROOM NO. 3 R/B (RADIATOR UPPER SUPPORT RH)
,,,
,,,
,,,
: JUNCTION BLOCK AND WIRE HARNESS CONNECTOR
CODE
SEE PAGE
JUNCTION BLOCK AND WIRE HARNESS (CONNECTOR LOCATION)
1C
24
COWL WIRE AND INSTRUMENT PANEL J/B (LOWER FINISH PANEL)
1D
24
INSTRUMENT PANEL WIRE AND INSTRUMENT PANEL J/B (LOWER FINISH PANEL)
1J
24
COWL WIRE AND INSTRUMENT PANEL J/B (LOWER FINISH PANEL)
1R
24
COWL WIRE AND INSTRUMENT PANEL J/B (LOWER FINISH PANEL)
SERVICE HINTS
SYSTEM OUTLINE
201
: CONNECTOR JOINING WIRE HARNESS AND WIRE HARNESS
CODE
SEE PAGE
JOINING WIRE HARNESS AND WIRE HARNESS (CONNECTOR LOCATION)
ID1
36
FLOOR WIRE AND COWL WIRE (LEFT KICK PANEL)
IJ1
38
INSTRUMENT PANEL WIRE AND COWL WIRE (UNDER THE GLOVE BOX)
IK3
38
ENGINE WIRE AND COWL WIRE (UNDER THE GLOVE BOX)
IM2
38
RIGHT RADIATOR SIDE SUPPORT
IM3
38
ENGINE ROOM MAIN WIRE AND COWL WIRE (RIGHT KICK PANEL)
IN1
38
FLOOR NO. 2 WIRE AND COWL WIRE (RIGHT KICK PANEL)
: GROUND POINTS
CODE
SEE PAGE
GROUND POINTS LOCATION
EA
34
RIGHT RADIATOR SIDE SUPPORT
EB
34
RIGHT RADIATOR SIDE SUPPORT
ED
34
SURGE TANK RH
: SPLICE POINTS
CODE
SEE PAGE
WIRE HARNESS WITH SPLICE POINTS
CODE
SEE PAGE
WIRE HARNESS WITH SPLICE POINTS
E 1
34
ENGINE ROOM MAIN WIRE
1
2
3
4
5
6
7
8
1
2
3
4
5
1
2
1
2
1 2
3
4 X X
7 8
9 10 11 12
1 2 3 4 5 6 7 8 9 10 11
12 13 14 15 16 X 18 19 20 21 22
X
X
18
20
X X X
1
2
1
2
7
3
X X
X
X
X
X
X 11
X X
X
16 X
X
X
X
23
22
X
X
X
4
X
X
X
X
X
X
X
X
14
X
A BLACK
A 5
B GRAY
A 6
A
A22
B
A23
A 9 GRAY
A10 GRAY
A24 GRAY
A33 GRAY
A34 GRAY
D 3 DARK GRAY
D 1 BLACK
C10 BROWN
3
3
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