2001 TOYOTA HIGHLANDER o2 sensor

2005 HIGHLANDER (EWD592U)
184
VSC and Tire Pressure Warning System
1. ABS Operation
If the brake pedal is depressed suddenly, the ABS controls the hydraulic pressure of the wheel cylinders for all the four
wheels to automatically avoid wheel locking and ensure the directional and steering stability of the vehicle. If the brake pedal
is depressed suddenly, the skid control ECU with actuator controls the solenoids in the actuators using the signals from the
sensors to move the brake fluid to the reservoir in order to release the braking pressure applied to the wheel cylinder. If the
skid control ECU with actuator detects that the fluid pressure in the wheel cylinder is insufficient, the ECU controls the
solenoids in the actuators to increase the braking pressure.
2. Traction Control Operation
The traction control system controls the engine torque, the hydraulic pressure of the driving wheel cylinders, slipping of the
wheels which may occur at start or acceleration of the vehicle, to ensure an optimal driving power and vehicle stability
corresponding to the road conditions.
3. VSC Operation
Unexpected road conditions, vehicle speed, emergency situation, and any other external factors may cause large under- or
over-steering of the vehicle. If this occurs, the VSC system automatically controls the engine power and wheel brakes to
reduce the under- or over-steering.
To reduce large over-steering :
If the VSC system determines that the over-steering is large, it activates the brakes for the outer front turning wheels
depending on the degree of the over-steering to produce the moment toward the outside of the vehicle and reduce the
over-steering.
To reduce large under-steering :
If the VSC system determines that the under-steering is large, it controls the engine power and activates the rear wheel
brakes to reduce the under-steering.
VSC indicator light
If an mulfunction occurs in the VSC system, the VSC indicator lights up to warn the driver.
4. Mutual System Control
To efficiently operate the VSC system at its optimal level, the VSC system and other control systems are mutually controlled
while the VSC system is being operated.
Engine control
The engine power does not interfere with the VSC brake control by fuel cut controlling and reducing the engine output.
Engine control and electronically controlled transmission control
The strong braking force does not interfere with the braking force control of the VSC system by turning off the accel and
reducing changes in the driving torque at shift-down.
VSC system operation indication
The slip indicator light flashes and the buzzer alarm intermittently to warn the driver that the current road is slippery, while the
VSC system is being operated.
5. Fail Safe Function
If an mulfunction occurs in the skid control ECU with actuator, sensor signals, and/or actuators, the skid control ECU with
actuator inhibits the brake actuator control and inputs the mulfunction signal to the engine control module. According to the
mulfunction signal, the brake actuator turns off the solenoid and the engine control module rejects any electronically
controlled request from the VSC system. As a result, the vehicle functions without the ABS, BA, TRAC, and VSC systems.
A4, A5 ABS Speed Sensor Front LH, RH
1-2 : 1.4-1.8 kW (20°C, 68°F)
A24, A25 ABS Speed Sensor Rear LH, RH
1-2 : 0.9-1.3 kW (25°C, 77°F) (4WD)
1-2 : Max. 1.45 kW (25°C, 77°F) (2WD)
B4 Brake Warning SW
1-2 : Closed with the float down
S27 Skid Control ECU with Actuator
46-Ground : Approx. 12 volts with the ignition SW at ON position
27-Ground : Approx. 12 volts with the stop light SW on (Brake pedal depressed)
31-Ground : Always continuity
S15 Stop Light SW
2-1 : Closed with brake pedal depressed
System Outline
Service Hints

2005 HIGHLANDER (EWD592U)
190
Power Window
GRB G GRO BR* 1 : w/ Navigation System
* 2 : w/o Navigation System
7. 5A
RAD NO. 2
1J 6
3A 10
3B 5 3A 8
3C 6
D 9 A 5 A 17 B 20 B21
GR
B
B
BR
GGRW
PD PU ACC IG BECU
A 2 D 7
IB 3B 3
3F 13 GND1 GND2
W- B W- B
IC 4H 11
4N 1
W- B W- B
4L 7
W- B
A 10
O
MPX2
B 6
IL2 1A 21
B 9
GR SB
MPX1B 2
A 9
YV
WMPX+
MPX-
MPX-
MPX+
MPX2
MPX1
W
3J 12
3E 1
G
MPD2
MPD1
IL2 12
B 1B2
A 1A2
A17MPX1 MPX2
G
GV R
BR BR
BR
11
4
(
*1)(
*1) (
*1)
G 5(
*2)
22 24
29
18E 6 From Power Source System (
See Page 62)
S30(
A)
, S31(
B) C11(
A)
, C12(
B)
A10(
A)
, A11(
B)
B 9(
A)
, B10(
B)
,
B11(
C)
, B12(
D)
A/C Control
Assembly
Airbag Sensor Assembly Body ECU
Combination Meter
Engine Control
Module
Gateway ECU
Shor t Connector

2005 HIGHLANDER (EWD592U)
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Door Lock Control
25A
DOOR LOCK
2A 2
7. 5A
RAD NO. 2
1J 6
IK2 8
3A 8
3E 13C 6
3G 12
R- B
W B
B BRG
D 9
BECUA 5
IGA 17
ACC D 4
BDR1 1D 3
IB2 2IB23 IB1 3IL1 8
IF3 5
IB2 1 4F 7A 10MPX2
IB2 8
920 108 7
W- L
R- L L- W
YVBR
WY V
YSB
O
CPUB SIG BDRMPX2 MPX1
IB1 2
4L 8
1D 144M 6 1E 4
IA
W- B
W- B W- B
W- B
D12 414 316
4321G
Y
LG
BR
2
IN12
W- B W- B GN D KL KUL L SWE LSW
7. 5A ECU- B
2A 4
IC3 5
1G 10
W- L BR
7. 5A
IG1
1D 1
P 5 1K 6
4A 5 IL2 1
A 21B 9
SB
B 2A 9
Y
R
1H 61K 10
IL2 12MPX1 6B
W
MPX2
MPX+
G
GR
MPX-MPX1
MPX-
MPX+4O 4
MPX1 31
L UL E LSSR12
IA2 14 IA14
BG3 9BG24 3B
LG V
B
1 23O 3
BR
YY
(
*4)
B14 W- B
BE A 4L 10
W- B
W- B
J14
(
*4)
(
*4)20A
P FR DOOR
24 22MPX1 MPX2
A 1A2
B 1B2 A17
BR
BR BR G
MPD2
4 11
MPD1
G 5
V
(
*1)
G(
*1) 3H 5
V
(
*3)R
3A 10
3B 5
18 29
G
(
*2)GR
T 4IL2 8IL217
UL 33 15
L
BR
(
*3)
SB
(
*3)
LG
(
*3)
Y
(
*3) From Power Source System (
See Page 62)
B 9(
A)
, B10(
B)
, B11(
C)
, B12(
D)
S30(
A)
, S31(
B) A10(
A)
, A11(
B)
C11(
A)
, C12(
B)
A/C Control Assembly
Airbag Sensor
Assembly
Body ECU
Back Door Key Lock and
Unlock SWCombination Meter
Door Key Lock and Unlock SW Front LH
Door Lock Motor Front LH
Door Unlock Detection SW Front LH
Gat ewa y ECU
Junction
Connector
Op tion
Connector 1
Power Window Master SW with ECU
Shor t Connector
Theft Deter rent ECU
Engine Control
Module E 6

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Wireless Door Lock Control
7. 5A
RAD
NO. 2
1J 6
3A 8 3A 10
3C 6 3B 5
W B BRG
D 9
BECUA 5
IGA 17
ACC 1D 3
IB2 2IB2 3
IB1 3IL1 8
IF3 5
IB2 1 4F 7A 10MPX2
IB2 8
920 108
W- L
R- L L- W
GRBR
WY V
Y SB
O
CPUB SIG BDRMPX2
IB1 2
4L 8
4L 10 1D 144M 6 1E 4
IA
W- B
W- B W- B
W- BIB1 5IB14 B BIA2 13 D 1ACT+
D 2ACTD
56
D12 414 316
4321
G
Y
LG
BR
W
RL
BRL
L
B
2G
L
IN12
W- B W- B GND KL KUL LSWE LSW
BR
7. 5A
ECU- B
2A 4
IC3 5
1G 10
W- L BR
7. 5A
IG1
1D 1
P 5
20A
P FR DOOR
1K 6
4A 5 A 21B 9
Y G Y
R
1H 61K 10
IL2 12MPX1 6B
W
MPX+G
GR
MPD2 MPX-
MPD1
L UL E LSSR L UL
M 7
V
MPX1J 5
B 2A 9
MPX-
MPX+IL21
3J 123E 1
11
4B 1B2 A 1A2
31
V
MPX1
T 4
3H 5MPX1 MPX2
BR BR
BR
A17
G
G 5
SB GR
G
(
*1)
(
*1)
B MPX2
MPX1
E 6
29
24 1822
(
*3)
(
*2) From Power Source System (
See Page 62)
C11(
A)
, C12(
B)
S30(
A)
, S31(
B)
B 9(
A)
, B10(
B)
, B11(
C)
, B12(
D)
A10(
A)
, A11(
B)
A/C Contr ol Assembly
Airbag Sensor
Assembly
Body ECU
Combi nati on Meter
Door Key Lock and Unlock SW Front LH
Door Lock Motor Front LH
Door Unlock Detection SW Front LH
Engine Control
Module Gateway ECU
Juncti on
Connector
Power Window Master SW
with ECU
Short Connector Theft Deterrent ECU

2005 HIGHLANDER (EWD592U)
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25A
DOOR
LOCK From Power Source System (
See Page 62)
2A 27. 5A
RAD
NO. 2
1J 6 10
IK2 83A 8 3A 10
3C 6 3B 5
61H
BECU 9D1K
R- B
W B
B BRG
A 5
IGA 17
ACC D 4
BDR1 42A
1D 3
IB2 2IB2 3
IB1 3IL1 8
IF3 5
IB2 1
4F 7A 10MPX2
IB2 8
920 107
W- L
R- L L- W
GR VBR
WY V
Y SB
O
CPUB SIG BDRMPX2 MPX1
IB1 2
4L 8
4L 10 1D 144M 6 1E 4
IA
W- B
W- B W- B
W- BIB1 5IB14 B BIA2 13 D 1ACT+
D 2ACTD
56
D12 414 316
4321
G
Y
LG
BR
W
RL
BRL
L
BB
2
LG
L
IN12
W- B W- B GND KL KUL LSWE LSW
BR
IC3 5
1G 10
W- L BR
7. 5A
IG1
1D 1
P 5 20A
P FR
DOOR
1K 6
4A 5 IL2 1
A 21B 9
SB
B 2A 9
G
R
GIL2 12 6B MPX+
G
GR
MPX- MPX-
MPX+
UL E LSSR L UL
M 7. 5A
ECU- B
1D 9
P
V
PB B
* 1 : w/ Navigation System
* 2 : w/o Navigation System
E E
P
B 1B2 A 1A2
BR
3J 123E 1
3H 5
Y
MPD1 MPD2
G 5
11 4
V
V
(
*1)
(
*2) G
(
*1)W
MPX1
E 618 29
MPX2
MPX1
W
8
W- B
GR
B 9(
A)
, B10(
B)
, B11(
C)
, B12(
D)
C11(
A)
, C12(
B)
A10(
A)
, A11(
B)
A/C Control AssemblyBody ECUCombination Meter
Door Key Lock and Unlock SW Front LH
Door Lock Motor Front LH
Door Unlock Detection SW Front LH
Engine Control Module
Gateway ECU
Power Window Master SW
with ECU
Junction
Connector J17
Junction
Connector J 5
MPX1 MPX2
Airbag Sensor
Assembly A17Short
Connector S30(
A)
, S31(
B)22 24
BR BR

2005 HIGHLANDER (EWD592U)
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Key Reminder and Seat Belt Warning
B 2
D D
1 2
4G 9
4L 74N1
IC
W- B G G
C 11
BB
W- B
W- B
7. 5A
RAD
NO. 2
1J 6
3A 8
3C 6
A 17
BW
7. 5A
IG1
1K 10
3A 10
3B 5
A 5
BR GR
7. 5A
ECU- B
2A 4
W- L
IC3 51G10
1H 6
D 9
G
ACC IG BECU
DCTY KSW
BR
1
D 7
K 4J 6
B 6
IB2 1
8MPX1
4F 7
4A 5
SB GR
P 5
W
MPX2
YO
IF3 5A 10MPX2
MPX2 MPX1 * 1 : w/ Navigation System
* 2 : w/o Navigation System
BR BR
BR R
W
IB2 8
7
V
MPX1
SB
B 22 B24
FSR- FSR+C
W
B
1C2
A 19 A2(
*3)
A 11 A6(
*4) LBE+ LBE-
3 1
G
R
B19 * 3 : w/ Curtain Shield Airbag
* 4 : w/o Curtain Shield Air bag
R
B W
IA1 9A 2A1 B 2B1
C 3C10(
*3)
(
*4) 1K 1LG
LG
From Power Source System (
See Page 62)
B 9(
A)
, B10(
B)
, B11(
C)
, B12(
D)
S30(
A)
, S31(
B) A16(
A)
, A17(
B)
, A18(
C)
Airbag Sensor
Assembly
Body ECU
Buckle SW LH
Door Courtesy SW
Front LH
Junction
Connector Unlock Warning SW
Power Window Master SW
with ECU
Short
Connector

2005 HIGHLANDER (EWD592U)
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IL2 12
R
Y
B 2A 9
MPX+MPX-3E 1
3J 12
G
V(
*1) W
G(
*2) 4
11MPD1
MPD2
G 5
G(
*1)
G(
*2)FSR+ FSR-A
B
W
B 8 4A8
B 12
12 SVC2 SIG2
SVC2 SIG2
W
L
B
3 2SGD2
SGD2
O
O 9 R
BL1 4BL11 W
B
1 2
B17A 5 A 9BSW BGND
L
GR
LG
W LG
Y
O 6(
A)
, O 7(
B)
Passenger' s
Seat Belt
A10(
A)
, A11(
B)
A/C Control Assembly
Buckle SW
(
Front Passenger ' s Side)
Gateway ECU
Occupant Classification ECU
Occupant Classification
Sensor Front RH

2005 HIGHLANDER (EWD592U)
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1. Seat Belt Warning System
When the ignition SW is turned to the ON position, the signal is input to the body ECU. At this time, to judge whether or not
the driver fastens the seat belt, the signal from the buckle SW LH is input to TERMINAL (A) 10 of the body ECU via multiplex
commnunication system (Bean bus). If the driver does not fasten the seat belt, the seat belt warning light in the combination
meter flashes and the alarm buzzer goes on, in response to the communication control of the body ECU etc.
Additionally, the sensor (Inside of buckle SW (Front passenger's side) ) installed on the front passenger seat detects the
passenger and determines whether or not the passenger fastens the seat belt.
If the passenger does not fasten the seat belt, the front passenger seat belt warning light is flashed.
2. Key Reminder System
If the driver door is opened with the ignition SW set at the ACC or OFF position and the ignition key remained inserted into
the key cylinder (The unlock warning SW is on), the signal from the unlock warning SW is input to TERMINAL (B) 2 of the
body ECU and the signal from the door courtesy SW LH is input to TERMINAL (C) 11 of body ECU. As a result, through
communication control of the body ECU etc. the buzzer in the combination meter goes on to warn the driver that the ignition
key is still inserted.
B19 Buckle SW LH
1-4 : Closed with the driver's seat belt in use
D7 Door Courtesy SW Front LH
1-Ground : Closed with the LH door open
K4 Unlock Warning SW
2-1 : Closed with the ignition key in the cylinder
B17 Buckle SW (Front Passenger's Side)
1-4 : Closed with the front passenger's seat belt in use
: PARTS LOCATION
CodeSee PageCodeSee PageCodeSee Page
A10A42B1747 (w/o Power Seat)O6A46 (w/ Power Seat)
A11B42B1946 (w/ Power Seat)O6A47 (w/o Power Seat)
A16A42B1947 (w/o Power Seat)O7B46 (w/ Power Seat)
A17B42C11A42O7B47 (w/o Power Seat)
A18C42C12B42O946 (w/ Power Seat)
B9A42D744O947 (w/o Power Seat)
B10B42E642P544
B11C42G543S30A43
B12D42J643S31B43
B1746 (w/ Power Seat)K443
System Outline
Service Hints