2001 TOYOTA SEQUOIA battery

F19452
Sub J/B No. 3Suspension Control
ECU
Instrument Panel J/BI18
Ignition SW
F10
FL BlockW±L 2
B
Battery IG1AM11 J37
AJ37
A J/C
B±R
S2510
IG
ALT5 8 W1L1
AM1
11C6 1C4 ECU±IG
1F4 B±R8
3A3C8
2B±YB±R
± DIAGNOSTICSAIR SUSPENSION SYSTEM
DI±793
987 Author: Date:
2005 SEQUOIA (RM1146U)
IG Signal Circuit
CIRCUIT DESCRIPTION
The suspension control ECU, controlling the air suspension system, is activated when the ignition switch
is turned ON.
The main relay inside the ECU is activated after 2 seconds and the system is operated by +B power source.
WIRING DIAGRAM
DIDEO±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.

DIDJW±01
F19887
Tire Pressure Monitor Valve Sub±assy
Tire Pressure
Warning Reset
Switch
Tire Pressure
Monitor ECU
Meter
DLC3
Tire Pressure Monitor Valve Sub±assyTire Pressure Monitor Receiver Assy
DI±800
± DIAGNOSTICSTIRE PRESSURE WARNING SYSTEM
994 Author: Date:
2005 SEQUOIA (RM1146U)
SYSTEM DESCRIPTION
1. DESCRIPTION OF SYSTEM
(a) A tire pressure monitor valve sub±assy equipped with a tire pressure sensor and a transmitter and is
installed in a tire wheel assy. The sensor measures the tire pressure and the measured value and
transmitter ID are transmitted to the tire pressure monitor receiver assy on the body as radio waves
and then sent to the tire pressure monitor ECU from the tire pressure monitor receiver. If the transmitter
ID has already been registered, the ECU compares the measured air pressure value with the standard
value. When the value is less than the standard value registered in the tire pressure monitor ECU, the
warning lamp on the combination meter comes on.

To address the differences in the air pressure settings by the type of tires, or the differences in
pressure between the front and rear tires, a tire pressure warning reset switch has been newly
adopted.

Along with the adoption of the tire pressure warning reset switch, the warning operation has been
changed.

TPWS transmitters with different bending angles as the tire pressure monitor valve sub±assy
have been provided for steel wheels with center ornaments. (They are not interchangeable with
aluminum wheels or steel wheels with full wheel caps.)
2. WHEN TIRE PRESSURE WARNING LAMP IS LIT
(a) When the warning lamp does not go off, or when it comes on during driving, check tire pressure. If the
warning lamp is lit even though the tire pressure is correctly adjusted, the tire could be punctured.
(b) Under the following conditions, the system may not function properly.

The areas, facilities or devices that use similar radio frequencies are located in the vicinity of the
vehicle.

A radio device of similar frequency is used in the vehicle.

A lot of snow or ice is stuck to the vehicle, especially onto the wheels and around the wheel
houses.

The battery of the sensor has been depleted.

The tires without tire pressure monitor valve sub±assy are used.

Tire chains are used.

± DIAGNOSTICSTIRE PRESSURE WARNING SYSTEM
DI±801
995 Author: Date:
2005 SEQUOIA (RM1146U)

When the spare tire is not within the receivable range of the electric wave, a signal may not be
received because spare tires are fixed. Accordingly, the system may not function properly. If
there is a possibility that the TPWS system does not receive a signal from the spare tire, rotate
the tire 90°.
HINT:

If any other wheels than the specified ones are used, the system may not function properly because
the radio waves are differently transmitted from the tire pressure sensor.

Depending on the tire type, the system may not function properly even though the specified wheels
are used.
(c) The average use life of the grommet of the tire pressure monitor valve sub±assy is approximately 5
years, at which time it must be replaced.
(d) After removing and installing the ECU or a sensor, output a diagnosis code and check that it is a normal
code.
3. FUNCTION OF COMPONENTS
ComponentsFunction
Tire pressure monitor valve sub±assy
Combined as a single unit with a disc wheel air valve, it measures tire pressure and
temperature and transmits an ID number for measurement value and identification.
Built±in the battery.
Tire pressure monitor receiver assyReceives and transmits a necessary signal from the transmitter to the tire pressure
monitor ECU.
Tire pressure monitor ECU
Receives the signal from the receiver and identifies it as vehicle's own signal. If the
measurement value is equal to or lower than the specified value, it transmits a sig-
nal so that the air pressure warning lamp on the combination meter comes on.
Tire pressure warning lampLocated in the combination meter, it informs the driver of lowered tire air pressure
and system failure.
Tire pressure warning reset switchEnters the initialization mode for tire or wheel replacement, or tire rotation
4. TIRE PRESSURE WARNING RESET SWITCH

By operating the tire pressure warning reset switch, the tire pressure monitor ECU can be set to issue
a warning at an inflation pressure that corresponds to the type of tires. Therefore, the dealer must set
the warning threshold to the proper value in order to comply with the local regulations.

Operate the tire pressure warning reset switch only after the inflation pressures of all 5 tires (including
the spare) have been adjusted on the vehicle.

To initialize the system, press and hold the tire pressure warning reset switch for 3 seconds or longer
with the ignition switch ON. After the system has been initialized, the warning lamp blinks 3 times (1
second ON, 1 second OFF).

During initialization, the tire pressure monitor valve sub±assy measures the inflation pressure of the
tires, and registers the signals that are transmitted into the tire pressure monitor ECU at a frequency
of one per minute. The initialization process is completed when the signals from the 5 tires have been
received.

The initialization process is canceled if the ignition switch is turned OFF during initialization. To initialize
again, the tire pressure warning reset switch must be pressed again. For this reason, once the tire pres-
sure warning reset switch has been pressed, turning OFF the ignition switch is not recommended for
a minimum of 20 minutes.

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).

± DIAGNOSTICSTIRE PRESSURE WARNING SYSTEM
DI±823
1017 Author: Date:
2005 SEQUOIA (RM1146U)Item
Measurement item/
Range (Display)Normal ConditionDiagnostic Note
TIRE TEMP1
ID1 temperature in tire/
min.: ±40
C (±40
F),
max.: 215
C (419
F)
Actual tire temperature±
TIRE TEMP2
ID2 temperature in tire/
min.: ±40
C (±40
F),
max.: 215
C (419
F)
Actual tire temperature±
TIRE TEMP3
ID3 temperature in tire/
min.: ±40
C (±40
F),
max.: 215
C (419
F)
Actual tire temperature±
TIRE TEMP4
ID4 temperature in tire/
min.: ±40
C (±40
F),
max.: 215
C (419
F)
Actual tire temperature±
TIRE TEMP5
ID5 temperature in tire/
min.: ±40
C (±40
F),
max.: 215
C (419
F)
Actual tire temperature±
BATT VOLT1ID1 battery voltage/
OVER or LESSOVER±
BATT VOLT2ID2 battery voltage/
OVER or LESSOVER±
BATT VOLT3ID3 battery voltage/
OVER or LESSOVER±
BATT VOLT4ID4 battery voltage/
OVER or LESSOVER±
BATT VOLT5ID5 battery voltage/
OVER or LESSOVER±
SELECT SW INFOSelect switch setting information/
WITH or WITHOUTWITH or WITHOUT±
INITIAL SW INFOInitialization switch setting informa-
tion/WITH or WITHOUTWITH or WITHOUT±
INIT THRESHOLD1
ID1 initial threshold of low±pres-
sure/
min.: 0 kpa (0 kgf´cm, 0 psi),
max.: 637.5 kpa (6.48 kgf´cm, 92.2
psi)
Tire pressure after initialization±
INIT THRESHOLD2
ID2 initial threshold of low±pres-
sure/
min.: 0 kpa (0 kgf´cm, 0 psi),
max.: 637.5 kpa (6.48 kgf´cm, 92.2
psi)
Tire pressure after initialization±
INIT THRESHOLD3
ID3 initial threshold of low±pres-
sure/
min.: 0 kpa (0 kgf´cm, 0 psi),
max.: 637.5 kpa (6.48 kgf´cm, 92.2
psi)
Tire pressure after initialization±
INIT THRESHOLD4
ID4 initial threshold of low±pres-
sure/
min.: 0 kpa (0 kgf´cm, 0 psi),
max.: 637.5 kpa (6.48 kgf´cm, 92.2
psi)
Tire pressure after initialization±

F19171
Tire Pressure
Monitor ECU Tire Pressure Monitor
Valve Sub±assy Front LH
Tire Pressure Monitor
Valve Sub±assy Rear LH Tire Pressure Monitor
Valve Sub±assy Front RH
Tire Pressure Monitor
Valve Sub±assy Rear RHJ29A
H
J30 3
4
5 BD2
5
1
4 +5V
RDA
GNDL
V
BR±R T19
Tire Pressure
Monitor Receiver
BD2
BD2L
VL
RF5V
RDA
GND2
Tire Pressure Monitor
Valve Sub±assy SpareJ29C J29B
I
J30
J
J30 BR±RBR±R J/C
T178
T177
T1716 V
: Radio Signal
± DIAGNOSTICSTIRE PRESSURE WARNING SYSTEM
DI±835
1029 Author: Date:
2005 SEQUOIA (RM1146U)
CIRCUIT DESCRIPTION
The tire pressure monitor valve sub±assy constantly sends radio waves to the tire pressure monitor receiver
assy. If the battery for the tire pressure monitor valve sub±assy is depleted, or if the tire pressure monitor
receiver assy is defective or comes off, the DTC will be output. DTCs C2121/21 to C2125/25 can only be
deleted by the tester. DTCs C2181/81 to C2185/85 can be deleted when the transmitter sends a force trans-
mission signal or the test mode ends. DTCs C2181/81 to C2185/85 are output only in the test mode.
DTC No.DTC Detecting ConditionTrouble Area
C2121/21
C2122/22
C2123/23
C2124/24
C2125/25A DTC is detected when the ECU receives no signals for
51 minutes or more, the vehicle speed is 5 mph (8 km/h) or
higher, and the ECU receives no signals for 12 minutes or
more.
Tire pressure monitor receiver assy

Each tire pressure monitor valve sub±assy

Tire pressure monitor ECU

Wire harness
C2181/81
C2182/82
C2183/83
C2184/84
C2185/85
Malfunction in the transmitting/receiving circuit

Tire pressure monitor receiver assy

Each tire pressure monitor valve sub±assy

Tire pressure monitor ECU

Wire harness
HINT:
It is necessary to perform the procedure to identify the tire pressure monitor valve sub±assy that is malfunc-
tioning because it cannot be identified by the output DTC.
WIRING DIAGRAM

F19172
Tire Pressure
Monitor ECU
IG
GND T17
11 Sub J/B No. 3
B±R
1FI18
Ignition SW
2
AM1 4
BatteryT172
8
3A
AA J37
J/C
B±R
IG11 Instrument Panel J/B
ECU±IG
12T17 T17T17
GND2 RDA
RF5V
GNDRDA+5V
1
45 T19 Tire Pressure
Monitor Receiver
BR±RVL
BD2 BD2 BD2
5
B±R
W±L8
7
16 J30H
J30I
J30JJ29A
J29B
J29C
BR±RVL
BR±RVL
8
3C
1C4
B±Y
1L1Instrument Panel J/B
AM1
1C6
W
ALT F10
Fusible Link BlockInstrument Panel J/B
1F10
1H1
W±B W±B
A
J8
J/C
IE 4 3J/C
5 8
B
± DIAGNOSTICSTIRE PRESSURE WARNING SYSTEM
DI±855
1049 Author: Date:
2005 SEQUOIA (RM1146U)
WIRING DIAGRAM