power steering TOYOTA HIGHLANDER 2001 Service User Guide

2005 HIGHLANDER (EWD592U)
156
SRS
10A
IGN
1L 6
B 5 B 10 B11
IG2 P+ P- 12
Y- B
Y
B 8B7
P2+ P2- 34
Y- R
Y- G
2 1
Y- B
Y
P132 1C 9C10
Y- B
Y
P14 PL+ PL- PR+ PR-
2 1B 14 B13
Y- B
Y
A20D+ D-
3 4B 16 B17
Y- R
Y- G
D2+ D2-
1 2B 15 B26
G
R
A 8+SL - SL
IK1 2IK11
W- R
BR
+SL - SL1 2B 9B20
+SR
W
B
A 9+SR - SR
IK1 3IK14
B- W
BR- W
-SR
BB
20 A A 17 A16 A18
SSL+ SSL- VUPL ESL
G
R
W
B
3241S16
1 4 2 3
B WR G
ESR VUPR SSR- SSR+15 C 17 C 16 C C13 S17 1G 6
P
SSL+ SSL- VUPL ESL SSR+ SSR- VUPR ESRP
A19
A 8
A 2A 7
A 1 4E1
4M4
C 56C(
*3)
(
*4)
(
*3) (
*3) (
*3) (
*3) (
*3) (
*3) (
*3) (
*3)
A16(
A)
, A17(
B)
, A18(
C) From Power Source System (
See Page 62)
Airbag Sensor
Fro nt LHAirbag Sensor
Fron t RHAirbag Sensor Assembly Airbag Squib
(
Front Passenger Air bag Assembly)
Airbag Squib
(
Steering Wheel Pad)Pretensioner LH Pretensioner RH Side Airbag Sensor Front LH Side Airbag Sensor Fr ont RH

2005 HIGHLANDER (EWD592U)
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The SRS is a driver and front passenger protection device which has a supplemental role to the seat belts.
When the ignition SW is turned to ON, the current from the IGN fuse flows to TERMINAL (B) 5 of the airbag sensor
assembly.
If an accident occurs while driving, when the frontal impact exceeds a set level, the current from the IGN fuse flows to
TERMINALS (B) 14, (B) 16, (B) 10, (B) 8, (A) 8 (w/ curtain shield airbag), or (A) 2 (w/o curtain shield airbag) and (C) 9 (w/
curtain shield airbag), or (C) 5 (w/o curtain shield airbag) of the airbag sensor assembly to the airbag squibs and the
pretensioners to TERMINALS (B) 13, (B) 17, (B) 11, (B) 7, (A) 7 (w/ curtain shield airbag), or (A) 1 (w/o curtain shield airbag)
and (C) 10 (w/ curtain shield airbag), or (C) 6 (w/o curtain shield airbag) of the airbag sensor assembly to TERMINAL (B) 27,
(B) 28 or BODY GROUND to GROUND, so that current flows to the airbag squibs and the pretensioners and causes them to
operate.
When the side impact also exceeds a set level, the current from the IGN fuse flows to TERMINALS (A) 12, (C) 5, (A) 9 and
(C) 8 of the airbag sensor assembly to the side airbag squibs and the curtain shield airbag squibs TERMINALS (A) 11, (C) 6,
(A) 10 and (C) 7 of the airbag sensor assembly to TERMINAL (B) 27, (B) 28 or BODY GROUND to GROUND, causing side
airbag squibs and curtain shield airbag squibs to operate.
The airbag stored inside the steering wheel pad is instantaneously expanded to soften the shock to the driver.
The airbag stored inside the passenger's instrument panel is instantaneously expanded to soften the shock to the front
passenger.
Side airbags are instantaneously expanded to soften the shock of side to the driver and front passenger.
The curtain shield airbag can ease an impact on the head of the front and rear passengers and reduce risks of injury.
In a head-on crash, the driver moves forward and may strike his/her lower limbs against the instrument panel, the key
cylinder, etc.
The pretensioners make sure of the seat belt restrainability.
: PARTS LOCATION
CodeSee PageCodeSee PageCodeSee Page
A838 (3MZ-FE)C1844O1047 (w/o Power Seat)A840 (2AZ-FE)C1944O1146 (w/ Power Seat)
A938 (3MZ-FE)D342O1147 (w/o Power Seat)A940 (2AZ-FE)E542P544
A10A42G543P1344
A11B42J643P1444
A16A42J1643S1645
A17B42J1743S1745
A18C42J1844S1846 (w/ Power Seat)
A1942O6A46 (w/ Power Seat)S1847 (w/o Power Seat)
A2042O6A47 (w/o Power Seat)S1946 (w/ Power Seat)
B9A42O7B46 (w/ Power Seat)S1947 (w/o Power Seat)
B10B42O7B47 (w/o Power Seat)S30A43
B1746 (w/ Power Seat)O846 (w/ Power Seat)S31B43B1747 (w/o Power Seat)O847 (w/o Power Seat)S3245
B1946 (w/ Power Seat)O946 (w/ Power Seat)S3345
C11A42O947 (w/o Power Seat)T1543
C12B42O1046 (w/ Power Seat)
System Outline

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182
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)
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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

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Multiplex Communication System - CAN
7. 5A
ECU- B
2A 4
10 1G
BF 15
29101 IG1S14
Y 1CANL
W- B
W
L
J19
W- BOL
CANHIG
ESS CANL CANHGND 91D
W
B
4N 14C 3
IC
W- B
BR
A J16 10 1D10A
ECU- IG
W- L P
3BAT
Y W
E
21 10
19 8 22 11E
J17P
4J 44C2
4C 11IO2 3V
3 2
W
B
W- B G
W
IO2 12 IO213
B
W
920
Y
4L 7
W- B W- B
W- BV
IC3 5
BBA
W- B
W- B
IC4 12 IC4 13
25 11 14 6
W
B
CANL CANH CANHCANL
S27 D 3
A From Power Source System (
See Page 62)
Data Link Connector 3Junction
Connector
Junction
Connector
Junction
Connector Steering Sensor
Skid Control ECU
with Actuator
Yaw Rate Sensor

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2005 HIGHLANDER from Nov. '04 Prod. (OM48570U)
1. Engine coolant reservoir
2. Power steering fluid reservoir
3. Engine oil filler cap
4. Engine oil level dipstick
5. Fuse blocks
6. Brake fluid reservoir
7. Battery
8. Radiator
9. Condenser
10. Electric cooling fans
11. Windshield and rear window washer
fluid tank
Engine compartment overview

2AZ- FE engine

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2005 HIGHLANDER from Nov. '04 Prod. (OM48570U)
1. Engine coolant reservoir
2. Power steering fluid reservoir
3. Engine oil level dipstick
4. Engine oil filler cap
5. Fuse blocks
6. Brake fluid reservoir
7. Battery
8. Radiator
9. Condenser
10. Electric cooling fans
11. Windshield and rear window washer
fluid tank
3MZ- FE engine

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2005 HIGHLANDER from Nov. '04 Prod. (OM48570U)
If you perform maintenance by yourself,
be sure to follow the correct procedure
given in this Section.
You should be aware that improper or in-
complete servicing may result in operating
problems.
Performing do- it- yourself maintenance
during the warranty period may affect your
warranty coverage. Read the separate
Toyota Warranty statement for details and
suggestions.
This Section gives instructions only for
those items that are relatively easy for an
owner to perform. As explained in Section
6, there are still a number of items that
must be done by a qualified technician
with special tools.
For information on tools and parts for do-
it- yourself maintenance, see Parts and
toolsº on page 377 in this Section.
Utmost care should be taken when work-
ing on your vehicle to prevent accidental
injury. Here are a few precautions that
you should be especially careful to ob-
serve:CAUTION
When the engine is running, keep
hands, clothing, and tools away
from the moving fan and engine
drive belts. (Removing rings,
watches, and ties is advisable.)
Right after driving, the engine
compartmentÐthe engine, radiator,
exhaust manifold, power steering
fluid reservoir and spark plug
boots, etc.Ðwill be hot. So be care-
ful not to touch them. Oil, fluids
and spark plugs may also be hot.
If the engine is hot, do not remove
the radiator cap or loosen the drain
plugs to prevent burning yourself.
Do not leave anything that may
burn easily, such as paper or rags,
in the engine compartment.
Do not smoke, cause sparks or al-
low open flames around fuel or the
battery. Their fumes are flammable.
Do not get under your vehicle with
just the body jack supporting it. Al-
ways use automotive jack stands or
other solid supports.
Be sure that the ignition is off if
you work near the electric cooling
fans or radiator grille. With the
ignition on, the electric cooling fans
will automatically start to run if the
engine coolant temperature is high
and/or the air conditioning is on.
Use eye protection whenever you
work on or under your vehicle
where you may be exposed to flying
or falling material, fluid spray, etc.
Used engine oil contains potentially
harmful contaminants which may
cause skin disorders such as in-
flammation or skin cancer, so care
should be taken to avoid prolonged
and repeated contact with it. To re-
move used engine oil from your
skin, wash thoroughly with soap
and water.
Do not leave used oil within the
reach of children.
Dispose of used oil and filter only
in a safe and acceptable manner.
Do not dispose of used oil and fil-
ter in household trash, in sewers or
onto the ground. Call your dealer or
a service station for information
concerning recycling or disposal.
Do- it- yourself service
precautions

'05 HIGHLANDER_U (L/O 0409)
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2005 HIGHLANDER from Nov. '04 Prod. (OM48570U)
Be extremely cautious when work-
ing on the battery. It contains poi-
sonous and corrosive sulfuric acid.
NOTICE

Remember that battery and ignition
cable carry high currents or volt-
ages. Be careful of accidentally
causing a short circuit.

Add only Toyota Super Long Life
Coolantº or similar high quality eth-
ylene glycol based non- silicate,
non- amine, non- nitrite, and non- bo-
rate coolant with long- life hybrid
organic acid technology to fill the
radiator. Toyota Super Long Life
Coolantº is a mixture of 50% cool-
ant and 50% deionized water (for
the U.S.A.) or 55% coolant and 45%
deionized water (for Canada).

If you spill some of the coolant, be
sure to wash it off with water to
prevent it from damaging the parts
or paint.

Do not allow dirt or anything else
to fall through the spark plug holes.

Use only spark plugs of the speci-
fied type. Using other types will
cause engine damage, loss of per-
formance or radio noise.

Do not reuse iridium- tipped spark
plugs by cleaning or regapping.

Do not overfill automatic transmis-
sion fluid and power steering fluid,
or the transmission and power
steering could be damaged.

Do not drive with the air cleaner
filter removed, or excessive engine
wear could result. Also backfiring
could cause a fire in the engine
compartment.

Be careful not to scratch the glass
surface with the wiper frame.

When closing the engine hood,
check to see that you have not for-
gotten any tools, rags, etc.
Front
Rear (two- wheel drive models)
Positioning the jack

'05 HIGHLANDER_U (L/O 0409)
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2005 HIGHLANDER from Nov. '04 Prod. (OM48570U)
Tools:
Funnel (only for adding coolant)
CHECKING BRAKE FLUID
Parts (if level is low):
SAE J1703 or FMVSS No.116 DOT 3
brake fluid
Tools:
Rag or paper towel
Funnel (only for adding fluid)
CHECKING POWER STEERING FLUID
Parts (if level is low):
Automatic transmission fluid
DEXRONII or III
Tools:
Rag or paper towel
Funnel (only for adding fluid)
CHECKING BATTERY CONDITION
Tools:
Warm water
Baking soda
Grease
Conventional wrench
(for terminal clamp bolts)CHECKING AND REPLACING FUSES
Parts (if replacement is necessary):
Fuse with same amperage rating as
original
ADDING WASHER FLUID
Parts:
Water
Washer fluid containing antifreeze
(for winter use)
Tools:
Funnel
REPLACING LIGHT BULBS
Parts:
Bulb with same number and wattage
rating as original (See charts in
Replacing light bulbsº on page 400 in
Section 7- 3.)
Tools:
Screwdriver