Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Toyota Sienna 2004-2007 Approved SRM 44 systemci 048abs
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F 6(A), F10(E), F12(G)
248
Fusible Link Block
W 30A ABS2 W
1 A
3 G
50A ABS1
3. 0W
B- R
1 E
FL MAIN
Battery
* 2 : Except * 1
* 1 : Automatic A/C
T4
Tire Pressure Warning
Standardization SW
1
2
1
22
24
W- B W- B L- O L- O B- R
10 B
24 A
IE
INIT
+BM
113 (*2)
123 (*1)
J 5(A), J 6(B)
J18
Junction
Connector
2
W
Junction
Connector
+BS
P6
Parking Brake SW
1
12
11
7
R- W R- W R- L GR- R GR- R W
17 A
3 B
11 A
23 B
9 1L
10 1K
28 1K
7 1C
SIL
D/G
PKB
D1
J 5(A), J 6(B)
Junction
Connector
8
13
P- B P- B P- B
10 A
22 B
10 1L
14 1K
TC
TC
J 7(A), J 8(B)
1
W- B W- B
Data Link Connector 3
Junction
ED
Connector
GND1
ABS and Tire Pressure Warning System
10
12
Y- G Y- G Y- G
3 A
17 B
TS
TS
S3
23
W- B W- B
2005 SIENNA (EWD613U)
GND2
J 5(A), J 6(B)
Junction
Connector
A3 A27
ABS Speed Sensor ABS Speed Sensor
Front LH Rear LH
2
1
13
7
1
2
L- W R R
6 IB1
FL+
RL+
Skid Control ECU with Actuator
5
26
6
O G G
FL-
RL-
IB1
A4 A28
ABS Speed Sensor ABS Speed Sensor
2
Front RH Rear RH
2
1
27
5
1
2
B LG LG
IL1
FR+
RR+
1
28
4
Y L L
FR-
IL1
RR-
From Power Source System (See Page 58)
10A 10A 10A
STOP ECU- IG GAUGE1
16 1C 6 1C 26 1L
B- R
W
R
2 85
J18
Junction
Connector
76
Stop Light SW
R
G- W
S12
1 10 II3
A
J2
Junction
R
Connector
A
2
G- W
B- R
P P1
Park/Neutral
Position SW
16 3 N
STP IG1 9 6
S3
Y- R
L- Y
Skid Control ECU with Actuator
SP1 BRL WA WTIR P N
17 19 30 21 14 15 5 II3 6 II3
GR- L
R- W
Y- R
Y- R
Y- B
L- Y
L- Y
GR
J 5(A), J 6(B)
8 A 9 A 80 71
J20
Connector
Junction
Junction
Connector
90 81
22 B 23 B
Y- R
Y- R
L- Y
L- Y
GR- L
R- W
Y- B
GR
249
2005 SIENNA (EWD613U)
ABS and Tire Pressure Warning System
From Power Source System (See Page 58)
7. 5A 10A
GAUGE2 ECU- B
25 1H 8 2C
W- L
B- R
24 1C
7 1L
C10
Combination Meter 32
W- L
Tire Pressure
Speedometer
BRAKE
ABS
6 7 14 13 35 30 12
GR- R
GR- L
R- W
W- L
Y- R
Y- B
BR
J 7(A), J 8(B)
Connector
18 B 3 B 5 B 17 B 4 B 34
Junction
Connector
Junction
J19
54
6 A 15 A 17 A 5 A 16 A
W- L
GR- L
R- W
Y- R
Y- B
GR
Brake Fluid Level
1
Warning SW
B1
2
W- B
Connector
A
Junction
GR- L
J1
R- W
A
Y- B
W- B
GR
W- B
BR
EA IF
250
2005 SIENNA (EWD613U)
System Outline
ABS system controls the respective brake fluid pressures acting on the disc brake cylinders of the four 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.
Tire pressure warning system turns on the tire pressure warning light and warns the driver of low tire pressure, when driving
with a low tire pressure, which may cause trouble driving.
However, this system can detect the low tire pressure condition only if one of the tires has such a condition in particular
compared to other tires, and it cannot detect. Therefore, it can not detect natural (Gradual) air loss occurring to the tires.
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 skid control ECU with
actuator.
(2) Stop light SW signal
A signal is input to TERMINAL STP of the skid control ECU with actuator when the brake pedal is operated.
(3) Standardization SW Signal
A signal is input to TERMINAL INIT of the skid control ECU with actuator when the tire pressure warning standardization
SW in operated.
(4) Parking position signal
A signal is input to TERMINAL P of the skid control ECU with actuator when the Shift lever at "P" position.
(5) Neutral position signal
A signal is input to TERMINAL N of the skid control ECU with actuator when the Shift lever at "N" position.
2. ABS 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.
3. Operation of Tire Pressure Warning System
In accordance with the reduction of tire pressure, tire diameter becomes small and the tire rotation speed becomes greater.
In the relation between the difference of the vehicle speed of normal wheels and the low pressure wheel and the tire
pressure, based on the speed signal detected during driving, it detects the change of the tire pressure.
As a result, if the system judges that the tire pressure has reduced, it turns on the tire pressure warning light and warn the
driver using the signal from the skid control ECU with actuator.
Service Hints
S3 Skid Control ECU with Actuator
2, 24-Ground : Always approx. 12 volts
3-Ground : Approx. 12 volts with the ignition SW at ON position
16-Ground : Approx. 12 volts with the brake pedal depressed
1, 23-Ground : Always continuity
A3, A4 ABS Speed Sensor Front LH, RH
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