2001 TOYOTA SEQUOIA instrument panel

F19446
W
41G±Y1
4A11
4AG±Y27
S25 STP
BatteryB ALT
85 W 1
1L STOP 2
1FS14
Stop Light Switch
Sub J/B No. 4Suspension Control
ECU
Instrument Panel J/BF10
Fusible Link Block
1L
± DIAGNOSTICSAIR SUSPENSION SYSTEM
DI±767
961 Author: Date:
2005 SEQUOIA (RM1146U)
DTC C1782/82 Stop Light Switch Circuit (Test Diagnosis)
CIRCUIT DESCRIPTION
When the brake pedal is depressed, the stop light comes on and the signal is input to the STP terminal of
the suspension control ECU.
HINT:
This DTC is output only when the sensor signal check is done.
DTC No.DTC Detecting ConditionTrouble Area
C1782/82The signal from the stop light switch assy does not change.

Stop light switch assy

Stop light switch circuit

Suspension control ECU
WIRING DIAGRAM
DIDE7±01

F19450
C6
Combination
MeterSuspension Control
ECU
I18
Ignition SW Instrument Panel J/B
Engine Room J/B24
14
15
16 LO
N
HIP
B±L
GR±R26
S25
9
S25
8
S25LO
NR
HI
6
IG2 AM25
W±R B±R IGN1 11
7 1H
1J1C
1C32
W±R
AM2
1
2C
2D1
B
Battery B±O
B 5 4F10
FL Block
± DIAGNOSTICSAIR SUSPENSION SYSTEM
DI±785
979 Author: Date:
2005 SEQUOIA (RM1146U)
Height Control Indicator Lamp Circuit
CIRCUIT DESCRIPTION
The height control indicator lamp indicates the target height, not the actual height.
It blinks when the height control is operated by pressing the height control switch and stays on when the
operation is completed.
WIRING DIAGRAM
DIDEL±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

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

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

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

F19174
Combination MeterTire Pressure
Monitor ECU
Engine Room J/B I18
Ignition SW IGN1
B±O
IG2 AM2 1C11
Battery 2
1H
T17 C5GR±L
Tire Pressure
B±R
B 56
54AM2 24
6IND Instrument Panel J/B
C620
2D1
2C1 1C3
1J7
F10
Fusible Link BlockInstrument Panel J/B
W±R
W±R
B
± DIAGNOSTICSTIRE PRESSURE WARNING SYSTEM
DI±873
1067 Author: Date:
2005 SEQUOIA (RM1146U)
Tire Pressure Warning Lamp Circuit
CIRCUIT DESCRIPTION
If the ECU detects trouble, the tire pressure warning lamp comes on and tire pressure monitor is cancelled
at the same time. At this time, the ECU records a DTC in memory.
Connect terminals Tc and CG of the DLC3 to make the tire pressure warning lamp blink and output the DTC.
WIRING DIAGRAM
DIDKF±01

F19790
Combination MeterTire Pressure
Monitor ECU
Engine Room J/B I18
Ignition SWIGN1
B±O
IG2AM2 1C11
Battery 2
1HT17
C5GR±L
Tire Pressure
B±R
B 56
54AM2 24
6IND Instrument Panel J/B
C620
2D1
2C1 1C3
1J7
F10
Fusible Link BlockInstrument Panel J/B
W±R
W±R
B
T17 T18 Tire Pressure
Warning Reset SW
G±R
CALSW
GND
T17 1H
1H
1F7
1 10
W±B11 10 Instrument Panel J/B
W±B
A J8
J/C
IE1 2
± DIAGNOSTICSTIRE PRESSURE WARNING SYSTEM
DI±875
1069 Author: Date:
2005 SEQUOIA (RM1146U)
Tire Pressure Warning Reset Switch Circuit
CIRCUIT DESCRIPTION
Receiving the signal from the tire pressure warning reset switch, the tire pressure monitor ECU indicates the
initialization of the pressure warning system.
WIRING DIAGRAM
DIDKG±01