2001 TOYOTA SEQUOIA ECU

I28450
MPX1 M61
12
B7
GR±R
1
D14
Door Courtesy Light
Switch Front LHGR±RBEAN
24
B5
DCTY J/C
J29
J30
NGBody ECUPosition Control
ECU & Switch
MPX2
± DIAGNOSTICSPOWER SEAT CONTROL SYSTEM (w/ Driving Position
Memory)DI±1533
1727 Author: Date:
2005 SEQUOIA (RM1146U)
Door courtesy switch circuit
CIRCUIT DESCRIPTION
The position control ECU & switch assy detects the open/close condition of the driver's door, via multiplex
communication, through the front door courtesy light switch.
WIRING DIAGRAM
DIDEE±01

I27699
Body ECU Wire Harness View:
B7
DCTY
± DIAGNOSTICSPOWER SEAT CONTROL SYSTEM (w/ Driving Position
Memory)DI±1535
1729 Author: Date:
2005 SEQUOIA (RM1146U)
3 Check harness and connector (Body ECU ± door courtesy light switch assy).
PREPARATION:
(a) Disconnect the B7 body ECU connector.
(b) Reinstall the courtesy light switch assy.
(c) Reconnect the courtesy light switch assy connector.
CHECK:
Measure the resistance of the wire harness side connectors.
OK:
Tester Connection
(Symbol)ConditionSpecified Condition
B7±12 (DCTY) ±
Body groundCourtesy light switch
pushed " free10 kW or higher
" Below 1 W
NG Repair or replace harness or connector.
OK
Proceed to next circuit inspection shown in
problem symptoms table (See page
DI±1508).

DI±1556
± DIAGNOSTICSCRUISE CONTROL SYSTEM
1750 Author: Date:
2005 SEQUOIA (RM1146U)
DTC P0607/54 Input signal circuit malfunction
CIRCUIT DESCRIPTION
This DTC indicates the internal abnormalities of the ECM.
DTC No.Detection ItemTrouble Area
P0607/54
The ECM has a supervisory CPU and a control ECU inside.
When each input STP signal is different for 0.15 sec. or more,
this trouble code is output.
This trouble code is output after 0.4 sec. has passed from the
time the cruise cancel input signal (STP input) is input into the
ECM.

ECM
HINT:
The ECM receives signals from each sensor to control all the functions of the cruise control with the micro-
computer.
When a trouble code is detected, fail safe remains on until the ignition switch is turned off.
INSPECTION PROCEDURE
Replace ECM (See page IN±35).
DIAB7±04

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

C00083CG
D6DLC3:
C00083
TCDLC3:
D6
± DIAGNOSTICSCRUISE CONTROL SYSTEM
DI±1569
1763 Author: Date:
2005 SEQUOIA (RM1146U)
2 Check harness and connector (CG of DLC3 ± Body ground).
CHECK:
Measure the resistance according to the value(s) in the table
below.
OK:
Symbol
(Tester connection)ConditionSpecified condition
CG (D6±4) ± Body groundAlwaysBelow 1 W
NG Repair or replace harness or connector.
OK
3 Check harness and connector (TC of DLC3 ± Body ground).
CHECK:
Measure the resistance according to the value(s) in the table
below.
OK:
Symbol
(Tester connection)ConditionSpecified condition
TC (D6±13) ± Body
groundAlways10 kW or higher
NG Repair or replace harness, connector or each
ECU.
OK
Replace ECM (See page IN±35).

DI1AJ±49
Vehicle Brought to Workshop
Customer Problem Analysis
Check and Clear DTCItems inside
are titles of pages in this manual,
with the page number in the bottom portion. See
the pages for detailed explanations.
Problem Symptom ConfirmationSymptom Simulation Symptom
does not occur
Symptom
occurs
DTC Check
Circuit Inspection and Part Inspection
DTC ChartProblem Symptoms Table
Identification of Problem
Repair
Confirmation Test
End
1
2
3
4
6
77
8
9
10
P. DI±1572
P. DI±1576
P. IN±24
P. DI±1573 P. DI±1576
P. DI±1578
P. DI±1580 ± DI±1599
Multiplex Communication System Inspection * 5
P. DI±1904
*: Confirm that there is no trouble by DTC check.
Normal system code
Trouble code
± DIAGNOSTICSENGINE IMMOBILISER SYSTEM
DI±1571
1765 Author: Date:
2005 SEQUOIA (RM1146U)
HOW TO PROCEED WITH TROUBLESHOOTING
HINT:
The ECU of this system is connected to the multiplex communication system. Therefore, before starting trou-
bleshooting, make sure to check that there is no trouble in the multiplex communication system.
Troubleshoot in accordance with the following procedures:

DI1AK±28
ENGINE IMMOBILISER Check SheetInspector 's
Name:
Customer 's Name
Date Vehicle
Brought InLicence Plate No. VIN
Production Date
Odometer Reading/ /
/ /
Date Problem First Occurred
Frequency Problem Occurs/ /
ContinuousIntermittent ( times a day)
DTC Check1st Time
2nd TimeNormal System Code
Trouble Code (Code )
Normal SystemCodeTrouble Code (Code )
Symptomskm
miles
Engine does not start.
Check ItemMalfunction
Indicator LampNormal
Remains ON Does not Light Up
Immobiliser is not set.
(Engine starts with key codes other than the registered key code.)
Security indicator is always ON.
Security indicator is always ON. (Although code has been registered in the
automatic registration mode, indicator is not OFF.)
Security indicator is OFF.
(When DTC of immobiliser is output)
Security indicator is OFF.
(When DTC of immobiliser is not output)
Security indicator is abnormally blinking.
No code is output. DI±1572
± DIAGNOSTICSENGINE IMMOBILISER SYSTEM
1766 Author: Date:
2005 SEQUOIA (RM1146U)
CUSTOMER PROBLEM ANALYSIS CHECK

DI1AP±40
± DIAGNOSTICSENGINE IMMOBILISER SYSTEM
DI±1573
1767 Author: Date:
2005 SEQUOIA (RM1146U)
PROBLEM SYMPTOMS TABLE
SymptomSuspected AreaSee page
Immobiliser is not set.
(Engine starts with key codes other than the registered key code.)1. Door courtesy light switch circuit (DTC12)
2. Transponder key ECUDI±1585
IN±35
Engine does not start.
1. Key
2. Key unlock warning switch circuit (DTC11)
3. Transponder key coil
4. Transponder key ECU
5. ECM*1
DI±1582
BE±143
IN±35
IN±35
Security indicator is always ON.
1. Security indicator
2. Security indicator light circuit
3. Transponder key ECU*2
DI±1597
IN±35
Security indicator is always ON.
(Although code has been registered in the automatic registration
mode, indicator is not OFF.)1. Transponder key coil
2. Transponder key ECUBE±143
IN±35
Security indicator is OFF.
(When DTC of immobiliser is output)1. Transponder key coil
2. Transponder key ECUBE±143
IN±35
Security indicator is OFF.
(When DTC of immobiliser is not output)1. Security indicator light circuit
2. Diagnosis circuit
3. Transponder key ECUDI±1597
DI±1599
IN±35
Security indicator is abnormally blinking.Transponder key ECUIN±35
No code is output.
1. Power source circuit
2. Diagnosis circuit
3. Transponder key ECUDI±1595
DI±1599
IN±35
*1 : Check that the key which did not start the engine has been registered, and that it is possible to start with
any other already registered key.
*2 : Finish the automatic registration mode because the mode might still be set.