2001 TOYOTA HIGHLANDER warning

2005 HIGHLANDER (EWD592U)
130
Turn Signal and Hazard Warning Light
* 1 : w/ Navigation System
7. 5A
IG1
1E 815A
HAZARD
2B 2
IC2 8
4C 10
4C 9 4C 8 4A 4
11 14
6 2 A A
B B
BC EG A15 IA2 1IF319 IF27 IC3 34E 8
4M 13
IB 3B 12
3F 133G 974E
6 2IA2 34A 9
EA AIK2 17
R 8
F 4 J1 2
J 3 J 1
LH
RH
4G 10 4C4
4M 6 4D 4
IL1 17
1E 4
1D 14
IAIL2 20
3B 9
3E 4 3B 8
8 19
Hazard
SW
A10 B 9 32 56 7 814
B
G- W LG
T 8
J20Y Y
F HAZ IG B
EL ER E HAZ LL LR
R
L
W
G
W- B
O
13
G
W
P
R
B G- B
L
GR
G
G- Y W- B
W- B
R
W- B W- B
LG W- B
W- B
W- B
W- B
L
R
W
W- B
W- B W- B
D DJ20 G
C11
R
(
*1)Turn L H
Turn RH
8
HAZ
Hazar d
SW
M 3
(
*2)
* 2 : w/o Navigation System
Tu rn SW
B
3K 2
W- B
BR
From Power Source System (
See Page 62)
Turn Turn
2
C13
A/C Control
Assembly Body ECU Combination MeterCombination SW
Front Turn Signal Light RH Junction
Connector
Junction
ConnectorJu nctio n
Connector
Junction
Connector Junction
Connector
Multi-
Display
Rear Combination Light RH
Turn Signal Flasher
Front Turn Signal Light LH F 3
Rear Combination Light LH R 72 23 3

2005 HIGHLANDER (EWD592U)
148
Light Auto Turn Off System
7. 5A
ECU- B
2A 47. 5A
IG1
1K 10
140A ALT
2
1
F 7 W
1A 115 231J 4
3
TAILLIGHT
Relay 40A MAIN
2I 12G 4
2
13 13 253
DRL NO. 2
Relay
3
B WR-BR-B
41 322B 1HEAD LAMP
Relay
L- R
SB L- R
(
*1)
R- B(
*1) (
*2)
A 7C3IK3 4
R SB
L- R
(
*1)
L- R
(
*2)
TRLY HRLYD 9
G
1H 61G 10IC3 5
BR W- L
BECUA 5
BR
3B 53A 10
GR
IG
B 2KSW
D D
1 2
4L 74G 9
4N 1
IC1C 11
Tail
Head14 13
16 OFFB 18 B17
IA C13
D 7 K 4 J 6
Battery FL MAI N
3. 0W
G G W- B W- B
W- B
BB
V
LG W- B W- B
DCTY TAI L HEAD
* 1 : w/ Dayti me Running Light
* 2 : w/o Daytime Running Light(
*2)
E10
(
*1) (
*1)
IA1 9From Power Source System (
See Page 62)
B 9(
A)
, B10(
B)
, B11(
C)
, B12(
D)
Body ECU
Combination SW
Door Courtesy SW
Front LH
Fusible Link Block
Junction
Connector
Unlock Warning
SW
Light
Control SW

2005 HIGHLANDER (EWD592U)
149
With the ignition SW turned on, the current flows to TERMINAL (A) 5 of the body ECU through IG1 fuse.
Voltage is applied at all times to TERMINAL (A) 7 of the body ECU through the TAILLIGHT relay. Coil side, and to
TERMINAL (C) 3 through the HEAD LAMP relay coil side (w/o daytime running light) or through the DRL NO.2 relay (w/
daytime running light).
1. Normal Lighting Operation

With the light control SW turned to TAIL position, a signal is input into TERMINAL (B) 18 of the body ECU. Due to this signal,
the current flowing to TERMINAL (A) 7 of the body ECU flows to TERMINAL (B) 18 to TERMINAL 14 of the light control SW
to TERMINAL 16 to GROUND, and TAILLIGHT relay causes taillights to turn on.

With the light control SW turned to HEAD position, a signal is input into TERMINALS (B) 17 and (B) 18 of the body ECU. Due
to this signal, the current flowing to TERMINAL (C) 3 of the body ECU flows to TERMINAL (B) 17 to TERMINAL 13 of the
light control SW to TERMINAL 16 to GROUND in the headlight circuit, and causes TAILLIGHT and HEAD LAMP (w/o
daytime running light) or DRL NO.2 relay (w/ daytime running light) 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 (A) 5 of the body ECU), when the driver's door is
opened (Input signal goes to TERMINAL (C) 11 of the body ECU), the ECU operates and the current is cut off which flows
from TERMINAL (A) 7 of the body ECU to TERMINAL (B) 18 in taillight circuit and from TERMINAL (C) 3 to TERMINAL (B)
17 in headlight circuit.
As a result, all lights are turned off automatically.
B9 (A), B10 (B), B12 (D) Body ECU
(D) 9-Ground : Always approx. 12 volts
(A) 5-Ground : Approx. 12 volts with the ignition SW at ON position
(B)17-Ground : Continuity with the light control SW at HEAD position
K4 Unlock Warning SW
2-1 : Closed with the ignition key in the cylinder
: PARTS LOCATION
CodeSee PageCodeSee PageCodeSee Page
B9A42C1342J643
B10B42D744K443
B11C42F738 (3MZ-FE)
B12D42F740 (2AZ-FE)
: RELAY BLOCKS
CodeSee PageRelay Blocks (Relay Block Location)
323Engine Room R/B No.3 (Engine Compartment Rear Left)
System Outline
Service Hints

2005 HIGHLANDER (EWD592U)
155
SRS
NOTICE: When inspecting or repairing the SRS, perform service in accordance with the following precautionary instructions
and the procedure, and precautions in the Repair Manual applicable for the model year.

Malfunction symptoms of the SRS are difficult to confirm, so the DTCs become the most important source of information
when troubleshooting. When troubleshooting the SRS, always inspect the DTCs before disconnecting the battery.

Work must be started more than 90 seconds after the ignition SW is turned to the ºLOCKº position and the
negative (-) terminal cable is disconnected from the battery.
(The SRS is equipped with a back-up power source so that if work is started within 90 seconds from
disconnecting the negative (-) terminal cable of the battery, the SRS may deploy.)

When the negative (-) terminal cable is disconnected from the battery, the memory of the clock and audio system will be
cleared. So before starting work, make a record of the contents in the audio memory system. When work is finished,
reset the audio systems as they were before and adjust the clock. Some vehicles have power tilt steering, power
telescopic steering, power seat and power outside rear view mirror which are all equipped with memory function.
However, it is not possible to make a record of these memory contents. So when the work is finished, it will be
necessary to explain it to your customer, and ask the customer to adjust the features and reset the memory. To avoid
erasing the memory in each system, never use a back-up power supply from outside the vehicle.

Before repair, remove the airbag sensor if shocks are likely to be applied to the sensor during repair.

Do not expose the following parts directly to hot air or flame;

Even in cases of a minor collision where the SRS does not deploy, the following parts should be inspected;

Never use SRS parts from another vehicle. When replacing parts, replace with new parts.

For the purpose of reuse, never disassemble and repair the following parts.

If the following parts have been dropped, or have cracks, dents and other defects in their case, bracket, and connector,
replace with new one.

Use a volt/ohmmeter with high impedance (10 kW/V minimum) for troubleshooting electrical circuits of the system.

Information labels are attached to the periphery of the SRS components. Follow the instructions of the notice.

After work on the SRS is completed, check the SRS warning light.

If the vehicle is equipped with a mobile communication system, refer to the precaution in the IN section of the Repair
Manual.
*Steering wheel pad
*Front passenger airbag assembly
*Side airbag assembly
*Curtain shield airbag assembly
*Seat belt pretensioner
*Center airbag sensor assembly
*Front airbag sensor assembly
*Side airbag sensor assembly

2005 HIGHLANDER (EWD592U)
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VSC and Tire Pressure Warning System
5
2 5
55IA1 IO2
MR 15 14
MRF1 2
IC2 6IC215
519 31
+BS RR+ RR-
1 2 FSW+
7
4J 3
4M 9
Y
R+ 45
B13
A25
28PKB
O
RL
1
S27
P 3ABS CUT RelayFL MAIN
3. 0W
Battery
WB
B- R
G- W
R- W B
GR
P Y
BRB B- OLG
B- R
2IO2
G- R
12 IA1
V RA24
RL- RL+6 2016 IC2 7IC22
1
Y- G
G
1 43CSW
41INIT
L- R
B- Y W W- B
W- B
IB
W- BT 6
4
121
P22
IC4 17 IC42
3J 44J6
ABS MTR Relay W- L
BM 25
1 89
50A ABS2 30A ABS1
5
5 5 51 51
32 32B- O
B
B
3F 13 4L74J 7
4N 1 4D 4 93G
IC
W- B
IL1 17 IC46
IF3 13
W
W- B
SB
P W- B
W- B W- B
IC4 11
LG
EH
W- B
1 GN D2
W- BF 7
(
*1) (
*1) (
*1) (
*1)
W- B 4C 3
W- B
ABS Speed Sensor Rear LH
ABS Speed Sensor Rear RH Br ake Pedal Load
Sensing SWFusible Link Block
Parking Brake SWPr essure SW
Skid Control ECU with Actuator
TRAC Off SW

2005 HIGHLANDER (EWD592U)
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VSC and Tire Pressure Warning System
A J16
A 21
11
W- B W- B
BR
12 IO213
W- L4C
B W
WL1D 9
GND CANH CANL ESSIG
CANH
L
O W- B
J19
L WW- B
8 19
BRSB SBV
BR SB SBV B WCANL
Y 1
S14
IG
1 10 9 25 1
20
BF 1G
W
104
P
2A7. 5A
ECU- B
P
BAT
3
J17
W
W- BG O
G
BGRY
4M
B
IO2 2
W
10E
YE
22 BR- W
B- R
BR- W
B- R GR
V
208IO2 3
3 11 4H
IC44C
IC4 102
2
9 44J
V 81 2 10 1D10A
ECU- IG
LG
LG
11K
V
IC3 5
BBA
W- B
W- B
W- BFrom Power Source System (
See Page 62)
Junction
Connector
Junction
Connector
Junction
Connector Steering Sensor
VSC War ning Buzzer
Yaw Rate SensorBuzzer

2005 HIGHLANDER (EWD592U)
183
10A
IGN
1G 6
V
SB
SB
BR
ABS VSC
Brake
W- BB 7A17 B11 B10 LG4M 4
4E 1
J 6
E
E
P SB
SB
6IF3 IF3 6IF2
R
IF3 16 15
V
R- B W- B VB WP
B 4P
W SB
IL1 9
A 13
IC4 1IF318
GR BR
6B
IB A 12 A 2A
5V 7V
Speedometer
1
B 6
R
11 A
3B 12
3K 2 11 IL2
IK3 12 V
VR
32A 10A
DOME
LG V
33D 93F
LG
PB
73C 43A 13 1KFrom Power Source System (
See Page 62)
10A
HEATER
BR
B 6
6B
(
2WD)(
2WD) TRAC OFFSlip Tire Air
Pressure
64H 11 4D
C11(
A)
, C12(
B)
Brake Warning SW
Combination Meter
Junction
Connector
2 1

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