2001 TOYOTA SEQUOIA height adjustment

± DIAGNOSTICSAIR SUSPENSION SYSTEM
DI±701
895 Author: Date:
2005 SEQUOIA (RM1146U)
2. REAR AIR SUSPENSION SYSTEM DESCRIPTION
(a) Auto leveling function
The function to keep the rear vehicle height fixed regardless of the change in the number of the occupants
or the load.
(b) Vehicle height control function
(1) Mode change:
The mode can be changed between the auto mode and the manual mode by operating the
height control mode select switch.
Vehicle height control can be canceled by changing the height control mode select switch
to manual mode.
(2) Auto mode:
Vehicle height can be set to NORMAL, HIGH (+40 mm (1.57 in.)) or LOW (4WD: ±30 mm
(±1.18 in.), 2WD: ±15 mm (±0.59 in.)) by operating the height control switch.
When vehicle speed is 12 km/h (7.46 mph) or less, vehicle height is LOW.
When vehicle speed is 30 km/h (18.64 mph) or less, vehicle height is HIGH.
(3) Manual mode:
Vehicle height can be set in any level within the vehicle height adjustable range by operat-
ing the height control switch.
Vehicle speed is 30 km/h (18.64 mph) or less.
(4) Adjusting time:
Approximately 20 seconds is needed to adjust vehicle height to UP (+40 mm (1.57 in.)).
Approximately 30 seconds is needed to adjust vehicle height to DOWN (±40 mm (±1.18
in.)).
(c) Vehicle speed detection function
When any of the following conditions are met with the vehicle height set to any position other than
NORMAL, vehicle height is automatically adjusted to NORMAL.
AUTO MODE: When vehicle speed is 12 km/h (7.46 mph) or less, vehicle height is LOW.
AUTO MODE: When vehicle speed is 30 km/h (18.64 mph) or less, vehicle height is HIGH.
MANUAL MODE: Vehicle speed is 30 km/h (18.64 mph) or less.
(d) Vehicle height adjustment control after turning the ignition switch off
If the rear vehicle height is raised after the ignition switch is turned off, such as when the occupant gets out
of the vehicle, vehicle height is lowered to the correct position for several seconds even after the ignition
switch is turned off.
(e) Fail±safe
If the vehicle control switch is operated frequently to change vehicle height, vehicle height control is sus-
pended for a while to prevent the compressor from becoming overheated.

DIDGK±01
A08841
Hand±held Tester
DLC3
DI±1128
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
1322 Author: Date:
2005 SEQUOIA (RM1146U)
INITIALIZATION
ZERO POINT CALIBRATION AND SENSITIVITY CHECK
NOTICE:
Make sure that the seat is not occupied before performing
the operation.
HINT:
Perform the zero point calibration and sensitivity check if any of
the following conditions occur.

The occupant classification ECU is replaced.

Accessories (seatback tray and seat cover, etc.) are
installed.

The passenger seat is removed from the vehicle.

The passenger airbag ON/OFF indicator (ºOFFº) comes
on when the passenger seat is not occupied.

The vehicle is brought to the workshop for repair due to
an accident or a collision.
Zero point calibration and sensitivity check procedures.
HINT:
Make sure that zero point calibration has finished normally, and
then perform the sensitivity check.
(1) Adjust the seat position according to the table be-
low.
Adjustment ComponentPosition
Slide DirectionRearmost position
Reclining AngleUpright position
Headrest HeightLowest position
Lifter HeightLowest position
(2) Connect the hand±held tester to the DLC3.
(3) Turn the ignition switch to the ON position.
(4) Perform the zero point calibration by following the
prompts on the tester screen shown in 2 pages lat-
er.
HINT:
Refer to the hand±held tester operator's manual for further de-
tails.
OK:
The ºCOMPLETEº is displayed.

SA28F±08
START
Preliminary Check
Tire pressure
Vehicle height
Brake dragging ROAD TEST
Does the vehicle lead/pull?
Cross switch front tire & wheel
assemblies (left & right).
Does the vehicle lead/pull in the
same direction as before?
Check front wheel alignment.
Is it within specification?
Adjust front wheel alignment.Reverse the front left side
tire and rebalance it.
Does the vehicle
lead/pull to the left?
COMPLETE
Are the tires uni±directional type?
Choose the position of front tire & wheel
assemblies where there is the least amount of pull.
Increase left front camber and decrease
right front camber until lead/pull is eliminated.Increase right front camber and decrease
left front camber until lead/pull is eliminated.
NO
YES
YES
NO
YES
YES
NO
YES
NO COMPLETE
NONOYES NOIs there steering
off center?
Adjust front tie rods.
NO
YES
Is the lead/pull stronger
than before?
YES
NOTICE : Do not exceed 1° of cross camber.
Do not exceed adjustment range.
Select a flat road where the vehicle can be driven in a straight line for 100 meters at a constant speed
of 35mph. Please confirm safety and set the steering wheel to its straight position. Drive the vehicle in
a straight line for 100 meters at a constant speed of 35mph without holding the steering wheel.
(1) The vehicle can keep straight but the steering wheel has some angle.
STEERING OFF CENTER (See page SR±10)
(2) The vehicle cannot keep straight.
STEERING PULL
YES NO
YES ROAD TEST
Does the vehicle still lead/pull?
NO ROAD TEST
Does the vehicle still lead/pull? ROAD TEST
Does the vehicle still lead/pull?
ROAD TEST
Does the vehicle still lead/pull?NO
Contact your local retail tire distributor.YES
*
*
SA±2
± SUSPENSION AND AXLETROUBLESHOOTING
2998 Author: Date:
2005 SEQUOIA (RM1146U)
REPAIR PROCEDURES
HINT:
This is a flow chart for vehicle pull.

SA2D0±01
F16824
HIGH
NORMAL
LOW SA±156
± SUSPENSION AND AXLEELECTRONIC MODULATED AIR SUSPENSION
3152 Author: Date:
2005 SEQUOIA (RM1146U)
ADJUSTMENT
1. ADJUST STANDARD VEHICLE HEIGHT
(a) Release the parking brake and stabilize the suspensions by pushing up and down on the corners of
the vehicle.
(b) Place the shift lever into the ºNº position and settle the tires by moving the vehicle back and forth.
(c) Start the engine.
(d) On the height control switch, first press ºHIGHº to raise the vehicle height, and then change the switch
to ºLOWº to lower it. Perform this operation one more time.
NOTICE:
Make sure to release the parking brake and move the shift lever into the ºNº position.
2. INSPECT TIRE (See page SA±3)
3. MEASURE VEHICLE HEIGHT (See page SA±4)
4. OPERATE HEIGHT CONTROL SWITCH AND CHECK
VEHICLE HEIGHT CHANGE
(a) Start the engine and change the height control switch
from the NORMAL position to the HIGH and LOW posi-
tions.
Check the time until the height adjustment is completed
and the amount of change in vehicle height.
Adjustment time
From operation of height control switch
to start of compressor.Approx. 2 sec.
From start of compressor to completion
of height adjustment.Approx. 20 sec.
Amount of change in vehicle height
HIGH position: 40 mm (1.57 in.)
LOW position:
4WD models: ±30 mm (±1.18 in.)
2WD models: ±15 mm (±0.59 in.)

F19820
HIGH
NORMAL
LOW
± SUSPENSION AND AXLEELECTRONIC MODULATED AIR SUSPENSION
SA±157
3153 Author: Date:
2005 SEQUOIA (RM1146U)
(b) While adjusting vehicle height in the HIGH position, start
the engine and change the height control switch from the
HIGH position to the NORM position.
Check the time until the height adjustment is completed
and the amount of change in vehicle height.
Adjustment time
From operation of height control switch
to open of exhaust valve.Approx. 2 sec.
From open of exhaust valve to completion
of height adjustment.Approx. 30 sec.
Amount of change in vehicle height
HIGH position: 40 mm (1.57 in.)
LOW position:
4WD models: ±30 mm (±1.18 in.)
2WD models: ±15 mm (±0.59 in.)

05_SEQUOIA_U (L/O 0408)
191
2005 SEQUOIA from Aug. '04 Prod. (OM34424U)
(c) Vehicle height adjustment
To change the mode, push the height
select switch on either side of ª
º
(higher) or ªº (lower).
The height control indicator light indicates
which mode is selected. (See ª(d) Indica-
tor lightsº described below.)
Selecting ªHIº modeÐ
Push the height select switch on the ª
º
side when the vehicle speed is 30 km/h
(18 mph) or less.
To change ªNº mode to ªHIº, push the
switch once.To change ªLOº mode to ªHIº, push the
switch twice.
Selecting ªNº modeÐ
To change ªHIº mode to ªNº, push the
height select switch on the ªº side once.
If the underbody of the vehicle has
touched the surface on bumpy roads, the
vehicle height cannot be lowered with the
height select switch.
To change ªLOº mode to ªNº, push the
height select switch on the ª
º side once.
Selecting ªLOº modeÐ
Push the height select switch on the ªº
side while the vehicle is stopped.
To change ªNº mode to ªLOº, push the
switch once.
To change ªHIº mode to ªLOº, push the
switch twice.
If the underbody of the vehicle has
touched the surface on bumpy roads, the
vehicle height cannot be lowered with the
height select switch.Even if the engine is stopped while the
vehicle height is being lowered, the opera-
tion continues for up to 35 seconds. If,
within this 35 seconds, any of the side
doors or the back door is opened, opera-
tion will continue for a further 15 seconds.
When adjusting the vehicle height with
one or more doors open, make sure that
there is nothing that might come into con-
tact with the vehicle body or around the
doors.

05_SEQUOIA_U (L/O 0408)
195
2005 SEQUOIA from Aug. '04 Prod. (OM34424U)
In manual control mode, the automatic lev-
eling function is turned off. When the ve-
hicle height is changed because of the
conditions (load etc.), you can adjust the
vehicle height with the height select
switch.
In manual control mode, if the vehicle
speed exceeds 30 km/h (18 mph), auto-
matic control mode is activated and ªNº is
selected automatically.
If you attempt to adjust the vehicle height
with anything such as snow, ice, or stones
in contact with the vehicle body, the ve-
hicle height may not change. In this case,
stop the vehicle and remove the obstruc-
tion.
CAUTION
If you drive through water, set the
vehicle height to ªHIº with the height
select switch and then change to
manual control mode by pushing the
mode select switch. Do not exceed 30
km/h (18 mph) or ªHIº mode will au-
tomatically change to ªNº mode. Do
not drive through water deeper than
about 700 mm (28 in.) even if the
vehicle height is in ªHIº mode.
NOTICE

When jacking up or installing tire
chains, be sure to set manual con-
trol mode by pushing the mode se-
lect switch and stop the engine.
Otherwise, the vehicle height may
change because of the automatic
leveling function, resulting in an ac-
cident.

If your vehicle must be towed, set
the vehicle height to ªNº in auto-
matic control mode, then select
manual control mode by pushing
the mode select switch. Otherwise,
the vehicle height may change be-
cause of the automatic leveling
function, resulting in an accident.

If your vehicle gets stuck in a
ditch, set manual control mode with
the mode select switch. Otherwise,
the vehicle height may change be-
cause of the automatic leveling
function, resulting in an accident.
(b) Vehicle height adjustment
To change the vehicle height in manual
mode, push the height select switch on
either side of ª
º (higher) or ªº
(lower).
A higher vehicle height is suitable when
driving on bumpy roads and through water.
A lower vehicle height allows for easy
access to the vehicle (getting in and out)
and easy loading and unloading.
When you are driving on bumpy roads,
which may cause the suspension to fully
elongate, the rear height control air sus-
pension may not operate.