Page 1065 of 4323
± DIAGNOSTICSTIRE PRESSURE WARNING SYSTEM
DI±863
1057 Author: Date:
2005 SEQUOIA (RM1146U)
7 Check tire pressure warning lamp.
PREPARATION:
(a) Turn the ignition switch to the ON position.
(b) Enter TEST MODE (see page DI±810).
(c) Press the tire pressure warning reset switch for 1 second or more after switching to TEST MODE.
CHECK:
Does the tire pressure warning lamp come on while pressing the tire pressure warning reset switch?
RESULT:
Comes onA
Does not come onB
B Go to step 14.
A
Page 1066 of 4323

DI±864
± DIAGNOSTICSTIRE PRESSURE WARNING SYSTEM
1058 Author: Date:
2005 SEQUOIA (RM1146U)
8 Check tire pressure warning lamp.
HINT:
Check all tires, including the spare, one at a time in this order: FR, FL, RR RL, Spare.
PREPARATION:
(a) Turn the ignition switch to the ON position.
(b) Rapidly reduce the pressure of the tires to approximately 120 kPa (1.2 kgf/cm
2, 35 psi).
(c) Check that the tire pressure warning lamp comes on for 1 second while rapidly reducing the pressure
or immediately after reducing the pressure.
(d) Note the check results.
(e) Set the tire pressure to the specified value.
CHECK:
Check that the tire pressure warning lamp comes on when each of the wheels is inspected.
RESULT:
Does not come on (All wheels)A
Does not come on (Some wheels)B
Comes on (All wheels)C
B Replace tire pressure monitor receiver assy
(See page SA±13).
HINT:
Replace the tire pressure monitor valve sub±assy for which the
tire pressure warning lamp did not come on during inspection.
C Perform initialization (See page DI±808).
A
Page 1067 of 4323

F19136
Tire Pressure Monitor ECU:
T17
RF5V
GND2RDA
F19137
Tire Pressure Monitor Receiver Assy:
T19
+5V
GNDRDA
F19138
Tire Pressure Monitor ECU:
T17
RF5V
GND2
± DIAGNOSTICSTIRE PRESSURE WARNING SYSTEM
DI±865
1059 Author: Date:
2005 SEQUOIA (RM1146U)
9 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:
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
10 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±8 (RF5V) ±
T17±16 (GND2)Ignition Switch ON4.5 to 5.5 V
NG Check power source circuit
(See page DI±878).
OK
Page 1068 of 4323
DI±866
± DIAGNOSTICSTIRE PRESSURE WARNING SYSTEM
1060 Author: Date:
2005 SEQUOIA (RM1146U)
11 Replace tire pressure monitor receiver assy (See page SA±13).
NEXT
12 Check DTC (See page DI±820).
PREPARATION:
Clear the DTCs.
CHECK:
Check for a DTC.
OK:
DTC is not output.
OK End
NG
13 Replace tire pressure monitor ECU and check DTC.
PREPARATION:
(a) Replace the tire pressure monitor ECU (see page SA±20).
(b) Clear the DTCs.
CHECK:
Check for a DTC.
OK:
DTC is not output.
NG Replace tire pressure monitor valve sub±assy
(See page SA±16).
OK
End
Page 1069 of 4323

F19884
Tire Pressure Warning Reset Switch
(harness side connector)
Tire Pressure Monitor ECU:T18
CALSW
T17
F19144
Tire Pressure Warning Reset Switch
ON
OFF2
1
± DIAGNOSTICSTIRE PRESSURE WARNING SYSTEM
DI±867
1061 Author: Date:
2005 SEQUOIA (RM1146U)
14 Check harness and connector (Tire pressure warning reset switch ± Tire pres-
sure monitor ECU).
PREPARATION:
Disconnect the tire pressure warning reset switch connector
T18 and tire pressure monitor ECU connector T17.
CHECK:
Measure the resistance according to the value(s) in the table
below.
OK:
Tester ConnectionSpecified Condition
T17±10 (CALSW) ± T18±1Below 1 W
T17±10 (CALSW) ± Body ground10 kW or higher
NG Repair or replace harness or connector.
OK
15 Inspect tire pressure warning reset switch.
PREPARATION:
Disconnect the tire pressure warning reset switch connector.
CHECK:
Measure the resistance between terminals 1 and 2 of the tire
pressure warning reset switch when the tire pressure warning
switch is ON and OFF.
OK:
Switch ConditionSpecified Condition
ONBelow 1 W
OFF10 kW or higher
NG Replace tire pressure warning reset switch.
OK
Page 1070 of 4323
F19138
Tire Pressure Monitor ECU:
T17
CALSW
GND2
DI±868
± DIAGNOSTICSTIRE PRESSURE WARNING SYSTEM
1062 Author: Date:
2005 SEQUOIA (RM1146U)
16 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±10 (CALSW) ±
T17±16 (GND2)IG Switch ON to OFF8 to 16 V
NG Repair or replace harness or connector.
OK
17 Check DTC (See page DI±820).
PREPARATION:
Clear the DTCs.
CHECK:
Check for a DTC.
OK:
DTC is not output.
OK End
NG
Page 1071 of 4323
± DIAGNOSTICSTIRE PRESSURE WARNING SYSTEM
DI±869
1063 Author: Date:
2005 SEQUOIA (RM1146U)
18 Replace tire pressure monitor ECU and check DTC.
PREPARATION:
(a) Replace the tire pressure monitor ECU (see page SA±20).
(b) Clear the DTCs.
CHECK:
Check for a DTC.
OK:
DTC is not output.
NG Replace tire pressure monitor valve sub±assy
(See page SA±16).
OK
End
Page 1072 of 4323
F19792
Combination Meter
Tire Pressure Monitor ECU
To BatterySPD G±O3
T17 C520
IEInstrument Panel J/BG±O
J8
J/C
AIF 10
1
1H11
T17GND
IG W±B W±B
T17 J17
J/C
BB
2 DI±870
± DIAGNOSTICSTIRE PRESSURE WARNING SYSTEM
1064 Author: Date:
2005 SEQUOIA (RM1146U)
DTC C2191/91 Vehicle Speed Signal Error
CIRCUIT DESCRIPTION
The tire pressure monitor ECU receives a speed signal from the combination meter. This DTC is stored upon
entering test mode but erased when a vehicle speed signal of 12 mph (20 km/h) is detected for 3 seconds
or more. The DTC is output only in test mode.
DTC No.DTC Detecting ConditionTrouble Area
C2191/91Speed sensor circuit malfunction.
Vehicle speed sensor
Combination meter assy
Tire pressure monitor ECU
Wire harness
WIRING DIAGRAM
DIDKE±01