Page 1057 of 4323
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
Page 1058 of 4323
F19137
Tire Pressure Monitor Receiver Assy:
T19
+5V
GND
DI±856
± DIAGNOSTICSTIRE PRESSURE WARNING SYSTEM
1050 Author: Date:
2005 SEQUOIA (RM1146U)
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 DI±805).
HINT:
Set the tire pressure to the specified value.
1 Inspect tire pressure monitor receiver assy.
PREPARATION:
(a) Disconnect the tire pressure monitor receiver assy T19
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 ConnectionConditionSpecified Condition
T19±4 (GND) ±
T19±5 (+5V)Ignition Switch ON4.5 to 5.5 V
NG Go to step 3.
OK
Page 1059 of 4323
F19136
Tire Pressure Monitor ECU:
T17
RDA
F19137
Tire Pressure Monitor Receiver Assy:
T19
RDA
± DIAGNOSTICSTIRE PRESSURE WARNING SYSTEM
DI±857
1051 Author: Date:
2005 SEQUOIA (RM1146U)
2 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 ConnectionSpecified Condition
T17±7 (RDA) ± T19±1 (RDA)Below 1 W
OK Go to step 5.
NG
Page 1060 of 4323

F19136
Tire Pressure Monitor ECU:
T17
RF5V
GND2RDA
F19137
Tire Pressure Monitor Receiver Assy:
T19
+5V
GNDRDA
DI±858
± DIAGNOSTICSTIRE PRESSURE WARNING SYSTEM
1052 Author: Date:
2005 SEQUOIA (RM1146U)
3 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 ConnectionSpecified Condition
T17±7 (RDA) ± T19±1 (RDA)Below 1 W
T17±8 (RF5V) ± T19±5 (+5V)Below 1 W
T17±16 (GND2) ± T19±4 (GND)Below 1 W
T17±7 (RDA) ± Body ground10 kW or higher
T17±8 (RF5V) ± Body ground10 kW or higher
T17±16 (GND2) ± Body ground10 kW or higher
NG Repair or replace harness or connector.
OK
4 Check power source circuit (See page DI±878).
NG Repair or replace power source circuit.
OK
5 Replace tire pressure monitor receiver assy (See page SA±13).
HINT:
Perform the inspection using parts from a normal vehicle when possible.
NEXT
Page 1061 of 4323
± DIAGNOSTICSTIRE PRESSURE WARNING SYSTEM
DI±859
1053 Author: Date:
2005 SEQUOIA (RM1146U)
6 Check DTC (See page DI±820).
CHECK:
(a) Check for a DTC.
OK:
DTC is not output.
HINT:
It is necessary to register an ID when replacing the tire pressure monitor ECU.
Read ID on the DATA LIST before removing the tire pressure monitor ECU. Register the ID to the new
tire pressure monitor ECU (see page DI±805).
NG Replace tire pressure monitor ECU
(See page SA±20).
OK
End
Page 1062 of 4323

DI±860
± DIAGNOSTICSTIRE PRESSURE WARNING SYSTEM
1054 Author: Date:
2005 SEQUOIA (RM1146U)
DTC C2177/77 Initialization Incomplete
CIRCUIT DESCRIPTION
Initialization is necessary after replacing either ECU, tires with different tire pressure or tire pressure monitor
valve sub±assy, after rotating the tires, or when a new vehicle is delivered.
DTC No.DTC Detection ConditionTrouble Area
C2177/77Initialization is not complete after vehicle speed of 5mph
(8km/h) or more continues for 20 minutes or more (total).
Tire pressure monitor valve sub±assy
Tire pressure monitor ECU
Tire pressure monitor receiver assy
Wire harness
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 DI±805).
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 blinkA
Comes on and goes off repeatedly at 0.5 second intervalsB
B Go to step 7.
A
2 Clear DTC (See page DI±820).
NEXT
DIDKD±01
Page 1063 of 4323
± DIAGNOSTICSTIRE PRESSURE WARNING SYSTEM
DI±861
1055 Author: Date:
2005 SEQUOIA (RM1146U)
3 Check DTC (See page DI±820).
CHECK:
Check for a DTC.
OK:
DTC C2177/77 is not output.
NG Go to step 4.
OK
Perform initialization (See page DI±808).
4 Check tire pressure warning lamp.
PREPARATION:
Turn the ignition switch to the ON position.
CHECK:
Check the tire pressure warning lamp comes on for 3 seconds and goes off.
RESULT:
Does not come onA
Comes onB
B Go to step 2.
A
Page 1064 of 4323

F19136
Tire Pressure Monitor ECU:
T17
IND
F19755
C5±20C5
Combination
Meter
F19138
Tire Pressure Monitor ECU:
T17
IND
GND2
DI±862
± DIAGNOSTICSTIRE PRESSURE WARNING SYSTEM
1056 Author: Date:
2005 SEQUOIA (RM1146U)
5 Check harness and connector (Tire pressure monitor ECU ± Combination meter).
PREPARATION:
Disconnect the tire pressure monitor ECU T17 connector and
C5 combination meter connector.
CHECK:
Measure the resistance according to the value(s) in the table
below.
OK:
Tester ConnectionSpecified Condition
T17±6 (IND) ± C5±20Below 1 W
T17±6 (IND) ± Body ground10 kW or higher
NG Repair or replace harness and connector.
OK
6 Inspect tire pressure monitor ECU.
PREPARATION:
Connect the tire pressure monitor ECU T17 connector.
CHECK:
Measure the voltage according to the value(s) in the table be-
low.
OK:
Tester connectionConditionSpecified condition
T17±6 (IND) ±
T17±16 (GND2)Immediately after turning
the ignition switch ON
(within 3 seconds)
8 to 16V
NG Replace tire pressure monitor ECU
(See page SA±20).
OK
Repair or replace combination meter
(See Page DI±1610).