2001 TOYOTA SEQUOIA terminal TC

F19434
43
Height Control Mode Select Switch
Pushed In
Free
DI±780
± DIAGNOSTICSAIR SUSPENSION SYSTEM
974 Author: Date:
2005 SEQUOIA (RM1146U)
2 Inspect height control mode select switch.
PREPARATION:
Disconnect the height control mode select switch connector.
CHECK:
Check continuity between terminals 3 and 4 of the height con-
trol mode select switch when the height control mode select
switch is pushed in and free.
OK:
Switch conditionSpecification
Pushed inContinuity
FreeNo continuity
NG Replace height control mode select switch.
OK

DI±782
± DIAGNOSTICSAIR SUSPENSION SYSTEM
976 Author: Date:
2005 SEQUOIA (RM1146U)
DTC U0100/65 Lost Communication with ECM/PCM
CIRCUIT DESCRIPTION
The ECM sends signals such as engine speed signal, transmission signal, shift position signal, L4 switch
signal, TC terminal signal (diagnosis mode signal) to the suspension control ECU, etc. when the air suspen-
sion system is in operation.
DTC No.DTC Detecting ConditionTrouble Area
U0100/65
The suspension control ECU detects the following conditions
simultaneously:
1. Ignition switch ON
2. Vehicle speed signal is more than 30 km/h (18.5 mph)
3. No communication from ECM continues for more than 3
seconds

ECM

Suspension control ECU

Communication circuit
INSPECTION PROCEDURE
HINT:
This circuit uses CAN for communication. Therefore, if there are any malfunctions in the communication cir-
cuit, one or more DTCs in the CAN communication system is/are output.
1 Go to CAN communication system (See page DI±1065).
DIDEG±01

± DIAGNOSTICSAIR SUSPENSION SYSTEM
DI±783
977 Author: Date:
2005 SEQUOIA (RM1146U)
DTC U0122/67 Lost Communication with Translate ECU
CIRCUIT DESCRIPTION
The translate ECU sends signals such as vehicle wheel speed signal, TS terminal signal (test mode signal)
to the suspension control ECU, etc. when the air suspension system is in operation.
DTC No.DTC Detecting ConditionTrouble Area
U0122/67
The suspension control ECU detects the following conditions
simultaneously:
1. Ignition switch ON
2. No communication from translate ECU continues for more
than 3 seconds

Translate ECU

Suspension control ECU

Communication circuit
INSPECTION PROCEDURE
HINT:
This circuit uses CAN for communication. Therefore, if there are any malfunctions in the communication cir-
cuit, one or more DTCs in the CAN communication system is/are output.
1 Go to CAN communication system (See page DI±1065).
DIDEH±01

F19451
C6
Combination
MeterSuspension Control
ECU
I18
Ignition SW
Engine Room J/B Instrument Panel J/B B±O
W±R11
7 1H
1JIGN1
1C
1C32
B±RMAN. 24
13 LG11
S25 VN
5
IG2 AM2 6
W±R
B
Battery 1
2D AM2
2C1
B5 4F10
FL Block
± DIAGNOSTICSAIR SUSPENSION SYSTEM
DI±789
983 Author: Date:
2005 SEQUOIA (RM1146U)
Height Control Manual Indicator Lamp Circuit
CIRCUIT DESCRIPTION
When manual mode is selected by pressing the height control mode select switch, the manual indicator lamp
comes on. (For the wiring diagram of the height control mode select switch circuit, see page DI±778.) If the
suspension control ECU detects a problem, the height control manual indicator lamp blinks while suspend-
ing the height control function. At the same time, the suspension control ECU records a DTC in the memory.
Connect terminals TC and CG of the DLC3 to make the height control manual indicator lamp blink and output
DTCs.
WIRING DIAGRAM
DIDEN±01

DIDJT±01
F19148
Combination Meter
Tire Pressure
Warning Lamp DI±796
± DIAGNOSTICSTIRE PRESSURE WARNING SYSTEM
990 Author: Date:
2005 SEQUOIA (RM1146U)
TIRE PRESSURE WARNING SYSTEM
PRECAUTION
NOTICE:
When disconnecting the battery terminal, initialize the following system after the terminal is recon-
nected.
System NameSee Page
Back Door Power Window Control SystemBE±77
1. TIRE PRESSURE WARNING SYSTEM PRECAUTION
(a) When the tire pressure warning lamp comes on, immedi-
ately check the tire pressure of the tire and adjust it to the
specified pressure. (The tire pressure warning lamp
comes on if there is an open in the tire pressure warning
lamp circuit.)
NOTICE:
Check the spare tire as well since this system monitors
pressure of all tires, including the spare.
Tire sizeFrontRearSpare
P245 / 70 R 16220 kPa (2.2 kgf/cm2, 32 psi)240 kPa (2.4 kgf/cm2, 35 psi)240 kPa (2.4 kgf/cm2, 35 psi)
P265 / 70 R 16220 kPa (2.2 kgf/cm2, 32 psi)220 kPa (2.2 kgf/cm2, 32 psi)220 kPa (2.2 kgf/cm2, 32 psi)
P265 / 65 R 17220 kPa (2.2 kgf/cm2, 32 psi)220 kPa (2.2 kgf/cm2, 32 psi)220 kPa (2.2 kgf/cm2, 32 psi)
(b) When the tire pressure warning lamp blinks, there is a
malfunction in the system. Check for DTCs.
(c) It is necessary to register the transmitter ID in the tire pres-
sure monitor ECU when replacing the tire pressure moni-
tor valve sub±assy and/or tire pressure monitor ECU (see
page DI±805).
(d) When replacing the tire pressure monitor ECU.
(1) Using the DATA LIST, read the transmitter IDs regis-
tered in the ECU and make a note of them before
removing the tire pressure monitor ECU.
(2) Register the transmitter IDs after installing a new
tire pressure monitor ECU.
(e) When replacing the tire pressure monitor valve sub±assy.
(1) Make a note of the 7 digit number (transmitter ID)
written on the tire pressure monitor valve sub±assy
when replacing the tire pressure monitor valve sub±
assy. Register the transmitter IDs in the tire pres-
sure monitor ECU after replacing the tire pressure
monitor valve sub±assy and installing the tires and
wheels on the vehicle.

DIDK1±01
DI±814
± DIAGNOSTICSTIRE PRESSURE WARNING SYSTEM
1008 Author: Date:
2005 SEQUOIA (RM1146U)
PROBLEM SYMPTOMS TABLE
If a normal code is displayed during DTC check but the problem still occurs, check the circuits for each prob-
lem symptom in the order given in the table below and proceed to the relevant troubleshooting page.
SymptomSuspected AreaSee page
Tire pressure warning system does not operate.
1. Tire pressure monitor valve sub±assy
2. Tire pressure monitor receiver assy
3. Power source circuit
4. Tc terminal circuit
5. Combination meter assy
6. Tire pressure monitor ECU±
±
DI±878
DI±888
BE±55
±
DTC check cannot be done.
1. Power source circuit
2. Tc terminal circuit
3. Tire pressure monitor ECUDI±878
DI±888
±
Tire pressure warning lamp malfunctions (Does not light up).
1. Power source circuit
2. Tire pressure warning lamp circuit
3. Combination meter assy
4. Tire pressure monitor ECUDI±878
DI±873
BE±55
±
Tire pressure warning lamp malfunctions (Remains ON).
1. Tire pressure check
2. Tire pressure monitor ECU connector poorly connected
3. Tire pressure warning lamp circuit
4. Combination meter assy
5. Tire pressure monitor ECUSA±3
±
DI±873
BE±55
±
Tire pressure warning lamp malfunctions (Blinking).
1. Check DTC
2. Tc terminal circuit
3. Test mode (SIGNAL CHECK)
4. Tire pressure monitor ECUDI±820
DI±888
DI±810
±
Initialization cannot be done.
1. Test mode (SIGNAL CHECK)
2. Tire pressure warning reset switch
3. Tire pressure monitor ECUDI±810
DI±875
±

DIDK2±01
F19129
T17
± DIAGNOSTICSTIRE PRESSURE WARNING SYSTEM
DI±815
1009 Author: Date:
2005 SEQUOIA (RM1146U)
TERMINALS OF ECU
HINT:
Inspect the connectors from the back side while the connectors are connected.
Symbols (Terminal No.)Wiring ColorTerminal DescriptionConditionSpecified Condition
IG (T17±2) ±
GND (T17±11)B±R ± W±BIG power sourceIG switch ON10 to 14 V
SPD (T17±3) ±
GND (T17±11)G±O ± W±BVehicle speed signalVehicle is runningPulse generation
SIL (T17±4) ±
GND (T17±11)G±R ± W±BDiagnosis tester commu-
nication lineIG switch ON, when com-
munication is not per-
formed with a tester
8 V or more
IND (T17±6) ±
GND (T17±11)GR±L ± W±BTire pressure warning lamp
output signalIG switch ON, tire pressure
warning lamp ON8 V or more
IND (T17±6) ±
GND (T17±11)GR±L ± W±BTire pressure warning lamp
output signalIG switch ON, tire pressure
warning lamp OFFBelow 1.5 V
RDA (T17±7) ±
GND (T17±11)V ± W±BTire pressure monitor re-
ceiver input signalIG switch ON, when the
tire pressure monitor re-
ceiver is not connected
10 to 14 V
RF5V (T17±8) ±
GND (T17±11)L ± W±BTire pressure monitor re-
ceiver power sourceIG switch ON4.5 to 5.5 V
CAL SW (T17±10) ±
GND (T17±11)GR ± W±BTire pressure warning re-
set SWIG switch ON
Tire pressure warning re-
set SW OFF
10 to 14 V
CAL SW (T17±10) ±
GND (T17±11)GR ± W±BTire pressure warning re-
set SWIG switch ON
Tire pressure warning re-
set SW ON
Below 1.5 V
GND (T17±11) ±
Body groundW±B ± Body groundGroundAlwaysBelow 1 W
TC (T17±12) ±
GND (T17±11)P±B ± W±BTc terminalWhen terminal TC is not
connected.8 V or more
GND2 (T17±16) ±
GND (T17±11)BR±R ± W±BTire pressure monitor re-
ceiver groundAlwaysBelow 1 W

D13491
DLC3:
BAT
SIL CG
DIDK3±01
F19148
Combination Meter
Tire Pressure
Warning Lamp DI±816
± DIAGNOSTICSTIRE PRESSURE WARNING SYSTEM
1010 Author: Date:
2005 SEQUOIA (RM1146U)
DIAGNOSIS SYSTEM
1. CHECK BATTERY VOLTAGE
Battery voltage: 11 to 14 V
If the voltage is below 11 V, recharge the battery before pro-
ceeding.
2. CHECK DLC3
The vehicle's tire pressure monitor ECU uses ISO 9141±2 for
communication. The terminal arrangement of DLC3 complies
with SAE J1962 and matches the ISO 9141±2 format.
Verify the conditions listed in the table below:
Terminal No.Disc.Connection / Voltage or ResistanceCondition
7SILBus + Line / Pulse generationDuring transmission
4CGChassis Ground to Body Ground / 1 W or lessAlways
16BATBattery Positive to Body Ground / 10 to 14 VAlways
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 DLC3, the ignition switch is turned to the ON position
and the tester 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 DLC3 on the original vehicle.

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.
3. DIAGNOSIS SYSTEM
(a) Warning lamp
(1) The tire pressure warning lamp blinks when there is
any malfunction in the tire pressure warning sys-
tem.
NOTICE:
When the malfunction has been corrected, the tire pres-
sure warning lamp does not come on.
(b) DTCs (Normal mode)
(1) DTCs are memorized in the tire pressure monitor
ECU and read by the blinks of the tire pressure
warning lamp or using the hand±held tester (see
page DI±820.
(c) Test mode
(1) By switching from normal mode into test mode (in-
put signal check), you can inspect the tire pressure
monitor receiver assy, each tire pressure monitor
valve sub±assy and vehicle speed sensor (see
page DI±810).