2001 TOYOTA SEQUOIA Service Repair Manual

fuse diagram jump cable oil type brake radio fuel

Page 921 of 4323

TOYOTA SEQUOIA 2001 Service Repair Manual F16807
GND
F19430
GND
± DIAGNOSTICSAIR SUSPENSION SYSTEM
DI±719
913 Author: Date:
2005 SEQUOIA (RM1146U) RM+ (S25±20) ±
GND (S25±22)
R±L ± W±B
Height Control
Compressor
Motor Lock (+)Engi

F16807
GND
F19430
GND
± DIAGNOSTICSAIR SUSPENSION SYSTEM
DI±719
913 Author: Date:
2005 SEQUOIA (RM1146U) RM+ (S25±20) ±
GND (S25±22)
R±L ± W±B
Height Control
Compressor
Motor Lock (+)Engine idling, vehicle height changes from ºNORMALº to
ºHIGHº by pressing the height control switch (While
height control compressor assy is working).
Below 1.0 V
RM± (S25±21) ±
Body groundBR±Y ± W±B
Height Control
Compressor
Motor Lock (±)
AlwaysBelow 1.0 V
GND (S25±22) ±
Body groundW±B ±
Body groundGroundAlwaysBelow 1.0 V
B (S25±24) ±
GND (S25±22)V ± W±BBatteryIG switch ON10 to 14 V
LO (S25±26) ± PWB
Height Control
I di t ºLOº
Engine idling, vehicle height is ºNORMALº "
P i th ºDOWNº b tt f th h i ht t l it h10 V or more "LO (S25 26)
GND (S25±22)P ± W±BIndicator ºLOº
SignalPressing the ºDOWNº button of the height control switch
turns on the ºLOº indicator lamp (*1)10 V or more "
Below 5 V
STP (S25±27) ± GY WBStop LightBk dld dRl d10 to 14 V "STP (S25 27)
GND (S25±22)G±Y ± W±BSto Light
SwitchBrake pedal depressed " Released10 to 14 V "
Below 1.5 V
SIL (S25±30) ±
GND (S25±22)G±R ± W±BDiagnosis Sig-
nalHand±held tester is connected to DLC3Pulse generation
(See waveform 3)
DOOR (S25±31) ± RWBDSilIG switch ON, each door opened "Below 1.5 VDOOR (S25 31)
GND (S25±22)R ± W±BDoor SignalIG switch ON, each door o ened "
All door closed
Below 1.5 V
10 to 14 V
DNSW (S25±32) ±
GND (S25±22)W ± W±B
Height Control
Switch
ºDOWNº SignalIG switch ON, ºDOWNº button of height control switch
pushed in "
ºDOWNº button of height control switch releasedBelow 1.5 V "
10 to 14 V
BAT (S25±25) ±
GND (S25±22)V ± W±BBatteryAlways10 to 14 V
CANL (S25±28) ±
GND (S25±22)W ± W±BCAN Commu-
nication SignalIG switch ONPulse generation
(See waveform 1)
CANH (S25±29) ±
GND (S25±22)G ± W±BCAN Commu-
nication SignalIG switch ONPulse generation
(See waveform 2)
*1: Perform inspection after checking that the height control indicator lamp switches are illuminated when
the height control switch button is pressed.
Waveform 1 (Reference):
ItemContents
TerminalCANL ± GND
Tool setting1V/DIV, 10ms/DIV
Vehicle conditionIgnition SW ON, Engine stopped
Waveform 2 (Reference):
ItemContents
TerminalCANH ± GND
Tool setting1V/DIV, 10ms/DIV
Vehicle conditionIgnition SW ON, Engine stopped

Page 922 of 4323

TOYOTA SEQUOIA 2001 Service Repair Manual F19431
GND DI±720
± DIAGNOSTICSAIR SUSPENSION SYSTEM
914 Author: Date:
2005 SEQUOIA (RM1146U)
Waveform 3 (Reference):
ItemContents
TerminalSIL ± GND
Tool setting5V/DIV, 1ms/DIV
Vehicle conditio

Page 923 of 4323

TOYOTA SEQUOIA 2001 Service Repair Manual DIDD7±01
C00083DLC3
± DIAGNOSTICSAIR SUSPENSION SYSTEM
DI±721
915 Author: Date:
2005 SEQUOIA (RM1146U)
DIAGNOSIS SYSTEM
1. DIAGNOSIS SYSTEM
(a) Inspect the battery voltage.
Battery voltage: 11

DIDD7±01
C00083DLC3
± DIAGNOSTICSAIR SUSPENSION SYSTEM
DI±721
915 Author: Date:
2005 SEQUOIA (RM1146U)
DIAGNOSIS SYSTEM
1. DIAGNOSIS SYSTEM
(a) Inspect the battery voltage.
Battery voltage: 11 to 14 V
If voltage is below 11 V, recharge the battery before proceeding.
(b) Check DLC3.
The suspension control ECU uses the CAN system and
ISO 9141±2 for communication. The terminal arrange-
ment of the DLC3 complies with SAE J1962 and matches
the ISO 9141±2 format.
Verify the conditions listed in the table below:
Symbols (Terminal No.)Terminal DescriptionConditionSpecified Condition
SIL(7) ± SG(5)Bus º+º lineDuring communicationPulse generation
CG(4) ± Body groundChassis groundAlwaysBelow 1 W
SG(5) ± Body groundSignal groundAlwaysBelow 1 W
BAT(16) ± Body groundBattery positiveAlways11 to 14 V
CANH(6) ± CANL (14)HIGH±level CAN bus lineIG switch OFF54 to 67 W
CANH(6) ± Battery positiveHIGH±level CAN bus lineIG switch OFF1 MW or higher
CANH(6) ± CG(4)HIGH±level CAN bus lineIG switch OFF3 KW or higher
CANL(14) ± Battery positiveLOW±level CAN bus lineIG switch OFF1 MW or higher
CANL(14) ± CG(4)LOW±level CAN bus lineIG switch OFF3 KW or higher
HINT:
If the hand±held tester display shows UNABLE TO CONNECT
TO VEHICLE when the cable of the hand±held tester is con-
nected to the DLC3, the ignition switch is turned ON and the tes-
ter is operated, there is a problem on the vehicle side or tester
side.
If communication is normal when the tester is connected
to another vehicle, inspect the DLC3 on the original ve-
hicle.
If communication is still not possible when the tool is con-
nected to another vehicle, the problem is probably in the
tester itself, so consult the service department listed in the
tester 's instruction manual.
(c) DTCs (Normal mode)
(1) DTCs are memorized in the suspension control
ECU and read by using the SST check wire or the
hand±held tester (see page DI±723 for the proce-
dure of DTCs check).
SST 09843±18040
(d) Test mode (Input signal check)
(1) By switching from normal mode into test mode, you
can inspect the height control switch, height control
mode select switch, door courtesy lamp switch, and
stop lamp switch (see page DI±711).

Page 924 of 4323

TOYOTA SEQUOIA 2001 Service Repair Manual F16799
DI±722
± DIAGNOSTICSAIR SUSPENSION SYSTEM
916 Author: Date:
2005 SEQUOIA (RM1146U)
(e) Check the indicator lamp.
(1) Turn the ignition switch to the ON position.
(2) Check that the height

Page 925 of 4323

TOYOTA SEQUOIA 2001 Service Repair Manual DIDDA±01
C00083
DLC3
CG TC
F16800
Height
Control
Manual
Indicator
Lamp
F16801
ON0.25 sec.
OFF
0.25 sec.
0.5 sec.
1.5 sec.4.5 sec. 2.5 sec.
0.5 sec. ON
OFF Normal:
Codes 13 and 33:
1.5 sec.
Repeat

Page 926 of 4323

TOYOTA SEQUOIA 2001 Service Repair Manual BR3890
D05981
Hand±held
Tester
DLC3
DI±724
± DIAGNOSTICSAIR SUSPENSION SYSTEM
918 Author: Date:
2005 SEQUOIA (RM1146U)
(3) Clear DTCs stored in the ECU by depressing the
brake pedal 8 times or

Page 927 of 4323

TOYOTA SEQUOIA 2001 Service Repair Manual DIDDC±01
± DIAGNOSTICSAIR SUSPENSION SYSTEM
DI±725
919 Author: Date:
2005 SEQUOIA (RM1146U)
FAIL±SAFE CHART
FAIL±SAFE FUNCTION
When a rear air suspension system malfunction is detected under

DIDDC±01
± DIAGNOSTICSAIR SUSPENSION SYSTEM
DI±725
919 Author: Date:
2005 SEQUOIA (RM1146U)
FAIL±SAFE CHART
FAIL±SAFE FUNCTION
When a rear air suspension system malfunction is detected under normal control operation, the suspension
control ECU will suspend the switch control of the height control operation.
FAIL±SAFE CHART
DTC No.Malfunction ItemFail±safe OperationFail±safe Deactivation
Condition
C1714/14Malfunction in height
control sensor
Auto mode:
When the target vehicle height, just before fail, is higher than
ºNº, vehicle height is lowered for 20 seconds and then sys-
tem control shuts down.
Manual mode:
When the target vehicle height, just before switching to the
manual mode, is higher than ºNº, the switch operation to
lower vehicle height is available for only 20 seconds.
Return to normal condition.
C1733/33Open or short in gate
solenoid valveSystem control shuts down.Return to normal condition.
C1734/34Open or short in level-
ing solenoid valveSystem control shuts down.Return to normal condition.
C1735/35Open or short in ex-
haust solenoid valve
Auto mode:
After vehicle height is raised through control, the system
shuts down.
Manual mode:
When vehicle height is lower than ºNº, only the switch opera-
tion to raise vehicle height is available.
Return to normal condition.
C1741/41Open or short in AIR
SUS relay circuit
Auto mode:
After vehicle height is lowered through control, the system
shuts down.
Manual mode:
When vehicle height is higher than ºNº, only the switch op-
eration to lower vehicle height is available.
Return to normal condition.
C1742/42Lock in height control
compressor motor
Auto mode:
After vehicle height is lowered through control, the system
shuts down.
Manual mode:
When vehicle height is higher than ºNº, only the switch op-
eration to lower vehicle height is available.
After interrupting for 70 min-
utes, restart the control.
C1751/51
Powered continuously
or powered excessive-
ly in height control
compressor motor
Auto mode:
After vehicle height is lowered through control, the system
shuts down.
Manual mode:
When vehicle height is higher than ºNº, only the switch op-
eration to lower vehicle height is available.
After interrupting for 70 min-
utes, restart the control.
C1761/61Malfunction in suspen-
sion control ECUSystem control shuts down.Return to normal condition.
C1774/74Power voltage
droppedSystem control shuts down.Return to normal condition.
U0100/65Lost communication
with TL ECUSystem control continues.Return to normal condition.

Page 928 of 4323

TOYOTA SEQUOIA 2001 Service Repair Manual DI±726
± DIAGNOSTICSAIR SUSPENSION SYSTEM
920 Author: Date:
2005 SEQUOIA (RM1146U)U0122/67
Lost communication
with ECM/PCMSystem control continues.Return to normal condition.
U0132/71
Lost commu

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