2001 TOYOTA SEQUOIA Service Repair Manual

automatic transmission CD changer wipers stop start battery location technical specifications

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Page 897 of 4323

TOYOTA SEQUOIA 2001 Service Repair Manual DIDCB±01
± DIAGNOSTICSAIR SUSPENSION SYSTEM
DI±695
889 Author: Date:
2005 SEQUOIA (RM1146U)
AIR SUSPENSION SYSTEM
PRECAUTION
Be sure to switch the height control mode select switch to manual mo

Page 898 of 4323

TOYOTA SEQUOIA 2001 Service Repair Manual DIDCF±01
F19439
Crankshaft
Position SensorEngine Room R/B No. 3
Engine Room J/B
Instrument
Panel J/B
STOP Fuse
IGN1 Fuse
ECU±IG Fuse
Stop Light
Switch
Combination Meter
Height Control Switc

Page 899 of 4323

TOYOTA SEQUOIA 2001 Service Repair Manual F19440
Height Control
Cylinder Assy
(Pneumatic Cylinder)
Height Control Valve Height Control Cylinder Assy
(Pneumatic Cylinder)
Door Courtesy Light Switch
Leveling Solenoid Valve
Gate Solenoid

Page 900 of 4323

TOYOTA SEQUOIA 2001 Service Repair Manual DIDCI±01
F19438
Height Control Sensor
Sub±assy
Height Control Mode
Select Switch
Body ECU
Stop Light Switch
Front Door Courtesy
Light Switch (Driver)
Front Door Courtesy
Light Switch
(Passenger)

Page 901 of 4323

TOYOTA SEQUOIA 2001 Service Repair Manual ± DIAGNOSTICSAIR SUSPENSION SYSTEM
DI±699
893 Author: Date:
2005 SEQUOIA (RM1146U)
Input and output signals of each ECU.
Transmitting ECUReceiving ECUSignalCommunication method
ECM
Translate EC

Page 902 of 4323

TOYOTA SEQUOIA 2001 Service Repair Manual DIDCN±01
F19465
: CAN
Compressor Assy
Combination Meter
Suspension
Control
ECU Exhaust Solenoid
Valve
Gate Solenoid Valve
Leveling Solenoid ValveAIR SUS Relay
Height Control Cylinder
(Pneumatic Cy

Page 903 of 4323

TOYOTA SEQUOIA 2001 Service Repair Manual ± 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 heig

± 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.

Page 904 of 4323

TOYOTA SEQUOIA 2001 Service Repair Manual DI±702
± DIAGNOSTICSAIR SUSPENSION SYSTEM
896 Author: Date:
2005 SEQUOIA (RM1146U)
3. FUNCTION OF MAIN COMPONENTS
ComponentOutline
Height Control Mode Select SwitchUsed to select vehicle height

DI±702
± DIAGNOSTICSAIR SUSPENSION SYSTEM
896 Author: Date:
2005 SEQUOIA (RM1146U)
3. FUNCTION OF MAIN COMPONENTS
ComponentOutline
Height Control Mode Select SwitchUsed to select vehicle height control mode (Auto/Manual).
Used to operate or stop auto leveling control.
Height Control SwitchAuto mode: Used to select vehicle height (HIGH, NORMAL, LOW).
Manual mode: Used to select vehicle height optionally.
Height Control SensorConverts the vertical change of the rear axle, in proportion to the standard, to sig-
nals and detects vehicle height.
Height Control Indicator Lamp (Combination Meter)Auto mode: Target vehicle height is displayed (HIGH, NORMAL, LOW).
Manual mode: Current vehicle height is displayed (HIGH, NORMAL, LOW).
Height Control Manual Indicator Lamp (Combination Meter)
Comes on during manual mode.
Blinks when the suspension control ECU detects a system malfunction.
Blinks during test mode.
Displays output DTC.
Stop light SwitchDetects braking condition.
Used to clear DTCs.
Pneumatic Cylinder (Height Control Cylinder Assy)Supports the vehicle body and adjusts the vehicle height.
Height Control Compressor Assy (Compressor/Height Con-
trol Dryer)The compressor generates compressed air that is necessary to raise vehicle
height and supplies it to the height control cylinder assy.
The dryer removes moisture from the compressed air.
Exhaust Solenoid ValveDrains the air in the height control cylinder assy when vehicle height is lowered.
(Built into the height control compressor assy)
Leveling Solenoid ValveOpens or closes the passage between the height cylinder assy and height control
compressor assy.
Gate Solenoid ValveOpens or closes the passage between the right and left height control cylinder assy
(Built into the leveling solenoid valve).
Suspension Control ECU
Estimates vehicle condition based on the signals from sensors and switches, and
outputs the control signals to the compressor and valves.
Blinks the height control manual indicator light when a system malfunction is de-
tected.
Air Suspension RelaySupplies power to the height control compressor assy.
Door Courtesy Switch (Body ECU)Detects whether the 5 doors, including the back door, are opened or closed, and
sends the signals to the suspension control ECU.
ECMSends the engine speed signal, etc. to the suspension control ECU through CAN
communication.
Speed Sensor (Skid Control ECU)Sends the vehicle wheel speed signal, etc. to the suspension control ECU through
CAN communication via the translate ECU.

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