2001 TOYOTA SEQUOIA Service Repair Manual

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Page 2089 of 4323

TOYOTA SEQUOIA 2001 Service Repair Manual DIDF6±01
± DIAGNOSTICSMULTIPLEX COMMUNICATION SYSTEM
DI±1887
2081 Author: Date:
2005 SEQUOIA (RM1146U)
MULTIPLEX COMMUNICATION SYSTEM
PRECAUTION
NOTICE:
When disconnecting the battery terminal,

Page 2090 of 4323

TOYOTA SEQUOIA 2001 Service Repair Manual DIDF7±01
I28466
DLC 3Front
Passenger
Door ECUBody ECU
A/C ECU Combination
MeterBack Door
ECUDriver Door
ECU
MPX1
MPX2
MPX3
Slide Roof
ECU Memory
Seat ECU
& SwitchMPX1 MPX2 MPX1 MPX2 MPX1 MPX2
MPX±

Page 2091 of 4323

TOYOTA SEQUOIA 2001 Service Repair Manual DIDFN±01
B78765I28978
Battery
Serial Communication Switch
ECUOn On
Off
ECULight
Motor
Heater
Solenoid Conceptual Drawing
I28977
Frame
Data
Header End Message
± DIAGNOSTICSMULTIPLEX COMMUNICATION

Page 2092 of 4323

TOYOTA SEQUOIA 2001 Service Repair Manual B78774I28976
ECU
ECUECU
ECU Daisy
Chain
Open DI±1890
± DIAGNOSTICSMULTIPLEX COMMUNICATION SYSTEM
2084 Author: Date:
2005 SEQUOIA (RM1146U)
2. Network Style
Based on serial communication, various

Page 2093 of 4323

TOYOTA SEQUOIA 2001 Service Repair Manual I03343I03344I03345I03977
ECU
ECU
ECU
ECU
ECU
ECU Open Open
ECU
ECU
Open
ECU Disconnection (DTC is detected)
Open (DTC is detected)
Open (DTC is not detected)
I03346
Body ECU
OpenOpen
Detects the DTCs

Page 2094 of 4323

TOYOTA SEQUOIA 2001 Service Repair Manual DI3IO±11
Customer Problem Analysis
Vehicle Brought to Workshop
Problem Symptom ConfirmationSymptom Simulation Problem does not
occur
Check DTC
Normal code
Problem Symptoms Table
Identification of Pro

Page 2095 of 4323

TOYOTA SEQUOIA 2001 Service Repair Manual DI3IP±10
MULTIPLEX COMMUNICATION SYSTEM Check Sheet
Inspector s name:
Customer s Name
Date VehicleVIN
Production Date
Licence Plate No.
Odometer Reading / /km
mile
Weath

Page 2096 of 4323

TOYOTA SEQUOIA 2001 Service Repair Manual DIDFA±01
I27698
B5
B6B7
DI±1894
± DIAGNOSTICSMULTIPLEX COMMUNICATION SYSTEM
2088 Author: Date:
2005 SEQUOIA (RM1146U)
TERMINALS OF ECU
1. CHECK BODY ECU
(a) Disconnect the B5, B6 and B7 ECU con

DIDFA±01
I27698
B5
B6B7
DI±1894
± DIAGNOSTICSMULTIPLEX COMMUNICATION SYSTEM
2088 Author: Date:
2005 SEQUOIA (RM1146U)
TERMINALS OF ECU
1. CHECK BODY ECU
(a) Disconnect the B5, B6 and B7 ECU connectors.
(b) Measure the resistance or voltage of each terminal of the wire harness side connector.
Standard:
Symbols (Terminal No.)Wiring ColorTerminal DescriptionConditionSpecified Condition
BDR (B6±2) ±
Body groundL±W ± Body ground+B (BATT) power supplyAlways10 to 14 V
IG (B7±6) ± Body groundB±R ± Body groundIgnition power supplyIgnition switch ON10 to 14 V
ACC (B7±10) ±
Body groundGR ± Body groundACC power supplyIgnition switch ACC10 to 14 V
OBD2 (B5±2) ±
Body groundG±R ± Body groundBus º+º lineDuring transmissionPulse generation
S+B (B6±1) ± Body groundW±L ± Body ground+B (BATT) power supplyAlways10 to 14 V
BECU (B6±5) ±
Body groundW±R ± Body ground+B (BATT) power supplyAlways10 to 14 V
WIG (B7±5) ± Body groundL±Y ± Body groundIgnition power supplyIgnition switch ON10 to 14 V
MPX3 (B7±20) ±
Body groundG±O ± Body groundMPX lineAlways10 kW or higher
MPX2 (B5±24) ±
Body groundL±Y ± Body groundMPX lineAlways10 kW or higher
MPX1 (B7±22) ±
Body groundW±L ± Body groundMPX lineAlways10 kW or higher
GND1 (B6±6) ±
Body groundW±B ± Body groundGroundAlwaysBelow 1 W
PRG ± GND1
(B5±5 ± B6±6)V ± W±BWireless transmitter signal
groundWireless door look receiver
communication circuit±
RDA ± GND1
(B5±4 ± B6±6)R±G ± W±BWireless transmitter signal
inputWireless door lock control
system is operatedBelow 1 V
RDA ± GND1
(B5±4 ± B6±6)R±G ± W±BWireless transmitter signal
inputWireless door lock control
system is not operated10 to 14 V
GSW
(B6±16)GR±RAir bag sensor commu-
nication signalAir bag sensor commu-
nication circuit±
CLTS (*1) ± GND1
(B6±12 ± B6±6)Y ± W±BAutomatic light control sen-
sor (Signal)Ignition switch OFFBelow 1 V
CLTS (*1) ± GND1
(B6±12 ± B6±6)Y ± W±BAutomatic light control sen-
sor (Signal)Ignition switch ONSignal waveform
CLTE (*1) ± GND1
(B6±3 ± B6±6)BR ± W±BAutomatic light control sen-
sor (Ground)AlwaysBelow 1 V

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