2001 TOYOTA SEQUOIA ECU

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 for the
communication stop of the
3 ECUs. Example
± DIAGNOSTICSMULTIPLEX COMMUNICATION SYSTEM
DI±1891
2085 Author: Date:
2005 SEQUOIA (RM1146U)
3. DIAGNOSIS SYSTEM
(a) If a DTC for an ECU communication stop is indicated, a
connector may be disconnected or there may be open cir-
cuits on 2 or more communication buses. When there is
an open circuit on only 1 communication bus, no DTC will
be detected.
(b) If 2 communication buses are open at the position shown
in the illustration, DTCs for the ECU communication stop
between these 2 buses are indicated.

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

I18633
D22
± DIAGNOSTICSMULTIPLEX COMMUNICATION SYSTEM
DI±1895
2089 Author: Date:
2005 SEQUOIA (RM1146U) CLTB (*1) ± GND1
(B6±4 ± B6±6)
R±G ± W±BAutomatic light control sen-
sor (IG)Ignition switch OFFBelow 1 V
CLTB (*1) ± GND1
(B6±4 ± B6±6)R±G ± W±BAutomatic light control sen-
sor (IG)Ignition switch ON10 to 14 V
(*1): w/ Automatic Light Control
If the result is not as specified, there may be a malfunction on the wire harness side.
2. CHECK DRIVER DOOR ECU
(a) Disconnect the D22 ECU connector.
(b) Measure the resistance or voltage of each terminal of the wire harness side connector.
Standard:
Symbols (Terminals No.)Wiring ColorTerminal DescriptionConditionSpecified Condition
SIG (D22±21) ± Body groundB±R ±
Body groundIgnition power supplyIgnition switch ON10 to 14 V
CPUB (D22±23) ± Body groundW±R ±
Body ground+B (BATT) power supplyAlways10 to 14 V
MPX1 (D22±20) ± Body groundG±B ±
Body groundMPX lineAlways10 kW or higher
MPX2 (D22±8) ± Body groundW±L ±
Body groundMPX lineAlways10 kW or higher
BDR (D22±25) ± Body groundL±W ±
Body ground+B (BATT) power supplyAlways10 to 14 V
GND (D22±13) ± Body groundW±B ±
Body groundGroundAlwaysBelow 1 W
If the result is not as specified, there may be a malfunction on the wire harness side.

I18633
F18
w/ Driving Position Memory: DI±1896
± DIAGNOSTICSMULTIPLEX COMMUNICATION SYSTEM
2090 Author: Date:
2005 SEQUOIA (RM1146U)
3. CHECK FRONT PASSENGER DOOR ECU
(a) Disconnect the F18 ECU connector.
(b) Measure the resistance or voltage of each terminal of the wire harness side connector.
Standard:
Symbols (Terminals No.)Wiring ColorTerminal DescriptionConditionSpecified Condition
SIG (F18±21) ± Body groundB±R ±
Body groundIgnition power supplyIgnition switch ON10 to 14 V
BDR (F18±25) ± Body groundL±Y ±
Body ground+B (BATT) power supplyAlways10 to 14 V
MPX1 (F18±20) ± Body groundB ± Body groundMPX lineAlways10 kW or higher
MPX2 (F18±8) ± Body groundG±B ±
Body groundMPX lineAlways10 kW or higher
CPUB (F18±23) ± Body groundW±R ±
Body ground+B (BATT) power supplyAlways10 to 14 V
GND (F18±13) ± Body groundW±B ±
Body groundGroundAlwaysBelow 1 W
If the result is not as specified, there may be a malfunction on the wire harness side.

I18630
F18
w/o Driving Position Memory:
± DIAGNOSTICSMULTIPLEX COMMUNICATION SYSTEM
DI±1897
2091 Author: Date:
2005 SEQUOIA (RM1146U)
(a) Disconnect the F18 ECU connector.
(b) Measure the resistance or voltage of each terminal of the wire harness side connector.
Standard:
Symbols (Terminals No.)Wiring ColorTerminal DescriptionConditionSpecified Condition
SIG (F18±19) ± Body groundB±R ±
Body groundIgnition power supplyIgnition switch ON10 to 14 V
BDR (F18±20) ± Body groundL±Y ±
Body ground+B (BATT) power supplyAlways10 to 14 V
MPX1 (F18±10) ± Body groundB ± Body groundMPX lineAlways10 kW or higher
MPX2 (F18±11) ± Body groundG±B ±
Body groundMPX lineAlways10 kW or higher
CPUB (F18±12) ± Body groundW±R ±
Body ground+B (BATT) power supplyAlways10 to 14 V
GND (F18±8) ± Body groundW±B ±
Body groundGroundAlwaysBelow 1 W
If the result is not as specified, there may be a malfunction on the wire harness side.

I18632
S19
DI±1898
± DIAGNOSTICSMULTIPLEX COMMUNICATION SYSTEM
2092 Author: Date:
2005 SEQUOIA (RM1146U)
4. CHECK SLIDING ROOF ECU
(a) Disconnect the S19 ECU connector.
(b) Measure the resistance or voltage of each terminal of the wire harness side connector.
Standard:
Symbols (Terminals No.)Wiring ColorTerminal DescriptionConditionSpecified Condition
IG (S19±8) ± Body groundB±R ±
Body groundIgnition power supplyIgnition switch ON10 to 14 V
B (S19±5) ± Body groundL±W ±
Body ground+B (BATT) power supplyAlways10 to 14 V
MPX1 (S19±2) ± Body groundG±O ±
Body groundMPX lineAlways10 kW or higher
E (S19±7) ± Body groundW±B ±
Body groundGroundAlwaysBelow 1 W
If the result is not as specified, there may be a malfunction on the wire harness side.

I18627
B11
B10
± DIAGNOSTICSMULTIPLEX COMMUNICATION SYSTEM
DI±1899
2093 Author: Date:
2005 SEQUOIA (RM1146U)
5. CHECK BACK DOOR ECU
(a) Disconnect the B10 and B11 ECU connectors.
(b) Measure the resistance or voltage of each terminal of the wire harness side connector.
Standard:
Symbols (Terminals No.)Wiring ColorTerminal DescriptionConditionSpecified Condition
MPX2 (B11±1) ± Body groundB ± Body groundMPX lineAlways10 kW or higher
MPX1 (B11±2) ± Body groundLG±R ±
Body groundMPX lineAlways10 kW or higher
GND (B11±3) ± Body groundW±B ±
Body groundGroundAlwaysBelow 1 W
BDR (B11±4) ± Body groundL±W ±
Body ground+B (BATT) power supplyAlways10 to 14 V
BECU (B11±5) ± Body groundW±R ±
Body ground+B (BATT) power supplyAlways10 to 14 V
SIG (B11±6) ± Body groundB±R ±
Body groundIgnition power supplyIgnition switch ON10 to 14 V
If the result is not as specified, there may be a malfunction on the wire harness side.

I27716
M7
M6
± DIAGNOSTICSMULTIPLEX COMMUNICATION SYSTEM
DI±1901
2095 Author: Date:
2005 SEQUOIA (RM1146U)
7. CHECK MEMORY SEAT ECU & SWITCH (w/ Driving Position Memory)
(a) Disconnect the M6 and M7 ECU connectors.
(b) Measure the resistance or voltage of each terminal of the wire harness side connector.
Standard:
Symbols (Terminals No.)Wiring ColorTerminal DescriptionConditionSpecified Condition
MPX1 (M6±1) ± Body groundW ± Body groundMPX lineAlways10 kW or higher
IG (M6±4) ± Body groundB±R ±
Body groundIgnition power supplyIgnition switch ON10 to 14 V
SYSB (M6±8) ± Body groundW±R ±
Body ground+B (BATT) power supplyAlways10 to 14 V
GND (M7±1) ± Body groundW±B ±
Body groundGroundAlwaysBelow 1 W
+B (M7±5) ± Body groundL±O ±
Body ground+B (BATT) power supplyAlways10 to 14 V
If the result is not as specified, there may be a malfunction on the wire harness side.