2001 TOYOTA SEQUOIA wiring diagram

DI3CI±19
± DIAGNOSTICSCRUISE CONTROL SYSTEM
DI±1551
1745 Author: Date:
2005 SEQUOIA (RM1146U)
CIRCUIT INSPECTION
DTC P0500/21 Vehicle speed sensor circuit malfunction
DTC P0503/23 Vehicle speed sensor circuit malfunction
CIRCUIT DESCRIPTION
See page DI±278.
DTC No.DTC Detection ConditionTrouble Area
P0500/21
This trouble code is output when the vehicle speed signal from
the vehicle speed sensor is cut for 0.14 sec. or more while the
cruise control is in operation.
Vehicle speed sensor

Vehicle speed sensor signal circuit

ECM
P0503/23
Momentary interruption and noise are detected when a rapid
change of vehicle speed occurs while the cruise control is in
operation.
Vehicle speed sensor

Vehicle speed sensor signal circuit

ECM
WIRING DIAGRAM
See page DI±278.
INSPECTION PROCEDURE
See page DI±278.

I24840
Battery 117
1E
AM2
1 2W±RI18
Ignition SW
B±R
IG2
85E4ECM
ST1± 1
STOP16
5 S14
Stop Light SW
7G±Y
3
6E4STP
1C B±O
3
F10 FL Block
ALT IGN1
B B
W
1F 1L1
2D 2C15
W±RAM2
ST2
1C2
1J 2
4A2 B±OW4
2G±Y
Instrument Panel J/B
Sub J/B No. 4
Engine Room J/B
Instrument Panel J/B4L±B Sub J/B No. 4
4D1
1
4A4E DI±1552
± DIAGNOSTICSCRUISE CONTROL SYSTEM
1746 Author: Date:
2005 SEQUOIA (RM1146U)
DTC P0571/52 Stop light switch circuit malfunction
CIRCUIT DESCRIPTION
When the brake pedal is depressed, the stop light switch assy sends a signal to the ECM. When the ECM
receives this signal, it cancels the cruise control.
Fail±safe function operates to enable normal driving even if there is a malfunction in the stop light signal
circuit.
The cancel condition occurs when positive battery voltage is applied to terminal STP.
When the brake is applied, battery positive voltage is normally applied to terminal STP of the ECM through
the STOP fuse and the stop light switch assy, and the ECM turns the cruise control off.
DTC No.DTC Detection ConditionTrouble Area
P0571/52Stop light switch does not turn off even once the vehicle is
driven
Stop light switch assy

Stop light switch assy circuit

ECM
WIRING DIAGRAM
DIAB6±05

I28462
Combination Meter
Instrument Panel J/B
I18
Ignition SWEngine Room J/BPIECM
B±O LG±R
Cruise
W±R
Battery
IG2 B±R24
32
1H 1C
AM2
62
1 IGN1
1C6
7C5 E518
1C 1J
2C2D
W±R
5
AM2B 11
B54F10
FLB
± DIAGNOSTICSCRUISE CONTROL SYSTEM
DI±1557
1751 Author: Date:
2005 SEQUOIA (RM1146U)
CRUISE main indicator light circuit
CIRCUIT DESCRIPTION
The CRUISE main indicator light comes on while the cruise control system is in operation and blinks when
there are any problems with the system.
DTCs can be read by counting the number of times the CRUISE main indicator light blinks.
WIRING DIAGRAM
DIDF3±01

I28463
BR Spiral Cable Sub±assy
CANCEL ±SET +RES ON±OFF 1ECM
4CCS E5
IG4
3
CCSBRR±Y
Cruise Control Main Switch4 5
5
A
AC9
C9
B
BECC2
EB 14
± DIAGNOSTICSCRUISE CONTROL SYSTEM
DI±1561
1755 Author: Date:
2005 SEQUOIA (RM1146U)
Control Switch Circuit (Cruise Control Switch)
CIRCUIT DESCRIPTION
The cruise control main switch operates seven functions: SET, COAST, TAP±DOWN, RESUME, ACCEL,
TAP±UP, and CANCEL. The SET, TAP±DOWN and COAST functions, and the RESUME, ACCEL and TAP±
UP functions are operated with the same switch. The cruise control main switch is an automatic return type
switch which turns on only while operating it in each arrow direction and turns off after releasing it. The inter-
nal contact point of the cruise control main switch is turned on with the switch operation. Then the ECM reads
the CCS terminal voltage value that has been changed by the switch operation to control SET, COAST, RE-
SUME, ACCEL and CANCEL.
WIRING DIAGRAM
DIDF4±01

I28464
ECM
Sub J/B No.4
23
E4
1328
T5
15
A205
4E
TC
TC5
4B
5
4C 5
4D
5
4A 15
1F 9
1A
J43
J/C12
T17 P±B P±B Translate ECU
TCP±B
P±B
O
O 4 TC
CG D6
DLC3 Airbag Sensor
Assembly
Instrument Panel J/BTire Pressure
ECU
P±B
G
A A
IGTC
± DIAGNOSTICSCRUISE CONTROL SYSTEM
DI±1567
1761 Author: Date:
2005 SEQUOIA (RM1146U)
Diagnosis circuit
CIRCUIT DESCRIPTION
Making a short circuit between terminals TC and CG of the DLC3 will output DTCs from the DLC3.
WIRING DIAGRAM
HINT:
When a particular warning light stays blinking, a ground short in the wiring of terminal TC of the DLC3 or an
internal ground short in the relevant ECU is suspected.
DIDF5±01

DIABC±03
I24830
ECMT16
Transponder Key ECU
IMI
IMO16
15P ± G
11
10EFIO
EFII L ± Y E5
E5 DI±1580
± DIAGNOSTICSENGINE IMMOBILISER SYSTEM
1774 Author: Date:
2005 SEQUOIA (RM1146U)
CIRCUIT INSPECTION
DTC 99 Engine Immobiliser System Malfunction
CIRCUIT DESCRIPTION
This DTC is indicated when a DTC is output from the transponder key ECU, or when there is an open or short
circuit in the wire harness between the transponder key ECU and the ECM.
If the DTC is output after replacing the transponder key ECU or ECM, carry out the ECU communication ID
registration.
DTC No.DTC Detecting ConditionTrouble Area
99

Error in communication between ECM and transponder key
ECU, or in communication line.

Communication ID is different in communication with trans-
ponder key ECU.

ECU communication ID has not been registered

Transponder key ECU

ECM

Wire harness
WIRING DIAGRAM

I24832
Transponder Key ECU Body ECU
KSW Y±G
T169
KSW2
B515 DI±1582
± DIAGNOSTICSENGINE IMMOBILISER SYSTEM
1776 Author: Date:
2005 SEQUOIA (RM1146U)
Code 11 is not output
CIRCUIT DESCRIPTION
The transponder key ECU outputs DTC 11 when the key unlock warning switch is ON (key is inserted).
HINT:
DTC 11 is a normal code.
DTC No.DTC Detecting ConditionTrouble Area
11Key unlock warning switch operates normally.

Unlock warning switch

Transponder key ECU

Wire harness
WIRING DIAGRAM
DIABD±03

I24832
DCY2GR±L8
T16CTY Transponder Key ECU
13
B7 Body ECU
± DIAGNOSTICSENGINE IMMOBILISER SYSTEM
DI±1585
1779 Author: Date:
2005 SEQUOIA (RM1146U)
Code 12 is not output
CIRCUIT DESCRIPTION
The transponder key ECU outputs DTC 12 when the front driver's door is open.
HINT:
DTC 12 is a normal code.
DTC NoDTC Detecting ConditionTrouble Area
12Driver door courtesy light switch operates normally.

Driver door courtesy light switch

Transponder key ECU

Body ECU

Wire harness
WIRING DIAGRAM
DIABE±04