Toyota Sequoia (2005). Manual — part 260
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 RH
J29
A
H
J30
3
4
5
BD2
5
1
4
+5V
RDA
GND
L
V
BR–R
T19
Tire Pressure
Monitor Receiver
BD2
BD2
L
V
L
RF5V
RDA
GND2
Tire Pressure Monitor
Valve Sub–assy Spare
J29
C
J29
B
I
J30
J
J30
BR–R
BR–R
J/C
T17
8
T17
7
T17
16
V
: Radio Signal
–
DIAGNOSTICS
TIRE PRESSURE WARNING SYSTEM
DI–835
1029
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 Condition
Trouble Area
C2121/21
C2122/22
C2123/23
C2124/24
C2125/25
A 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
DI–836
–
DIAGNOSTICS
TIRE PRESSURE WARNING SYSTEM
1030
INSPECTION PROCEDURE
NOTICE:
It is necessary to register an ID code after replacing the tire pressure monitor valve sub–assy and/or
the tire pressure monitor ECU (see page
HINT:
Set the tire pressure to the specified value.
1
Check tire pressure warning lamp.
PREPARATION:
Turn the ignition switch to the ON position.
CHECK:
Check the tire pressure warning lamp.
RESULT:
Does not blink
A
Comes on and goes off repeatedly at 0.5 second intervals
B
B
Go to step 4.
A
2
Clear DTC (See page
NEXT
3
Check DTC (See page
CHECK:
Check for a DTC.
OK:
DTC is not output.
NG
OK
Check problem symptoms table
(See page
F19136
Tire Pressure Monitor ECU:
T17
RF5V
GND2
RDA
F19137
Tire Pressure Monitor Receiver Assy:
T19
+5V
GND
RDA
–
DIAGNOSTICS
TIRE PRESSURE WARNING SYSTEM
DI–837
1031
4
Check DTC (See page
CHECK:
Check if DTCs C2121/21, C2122/22, C2123/23, C2124/24 and C2125/25 are all output.
No
Go to step 10.
Yes
5
Check harness and connector (Tire pressure monitor receiver assy – Tire pres-
sure monitor ECU).
PREPARATION:
Disconnect the tire pressure monitor receiver assy T19 connec-
tor and tire pressure monitor ECU T17 connector.
CHECK:
Measure the resistance according to the value(s) in the table
below.
OK:
Tester Connection
Specified Condition
T17–7 (RDA) – T19–1 (RDA)
Below 1
Ω
T17–8 (RF5V) – T19–5 (+5V)
Below 1
Ω
T17–16 (GND2) – T19–4 (GND)
Below 1
Ω
T17–7 (RDA) – Body ground
10 k
Ω
or higher
T17–8 (RF5V) – Body ground
10 k
Ω
or higher
T17–16 (GND2) – Body ground
10 k
Ω
or higher
NG
Repair or replace harness or connector.
OK
F19138
Tire Pressure Monitor ECU:
T17
RF5V
GND2
DI–838
–
DIAGNOSTICS
TIRE PRESSURE WARNING SYSTEM
1032
6
Inspect tire pressure monitor ECU.
PREPARATION:
(a)
Connect the tire pressure monitor ECU T17 connector.
(b)
Turn the ignition switch to the ON position.
CHECK:
Measure the voltage according to the value(s) in the table be-
low.
OK:
Tester Connection
Condition
Specified Condition
T17–8 (RF5V) –
T17–16 (GND2)
Ignition Switch ON
4.5 to 5.5 V
NG
Check power source circuit
(See page
).
OK
7
Replace tire pressure monitor receiver assy (See page
HINT:
Perform the inspection using parts from a normal vehicle when possible.
NEXT
8
Check DTC
).
PREPARATION:
Clear the DTCs.
CHECK:
Check for a DTC.
OK:
DTC is not output.
OK
End
NG
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