2001 TOYOTA SEQUOIA airbag

± DIAGNOSTICSBODY CONTROL SYSTEM
DI±1691
1885 Author: Date:
2005 SEQUOIA (RM1146U) TAIL ± GND1
(B6±7 ± B6±6)
G ± W±BLight control switch
(TAIL)Light control switch OFF10 to 14 V
CLTS (*3) ± GND1
(B6±12 ± B6±6)Y ± W±BAutomatic light control
sensor (Signal)Ignition switch OFFBelow 1 V
CLTS (*3) ± GND1
(B6±12 ± B6±6)Y ± W±BAutomatic light control
sensor (Signal)Ignition switch ONSignal waveform
CLTE (*3) ± GND1
(B6±3 ± B6±6)BR ± W±BAutomatic light control
sensor (Ground)AlwaysBelow 1 V
CLTB (*3) ± GND1
(B6±4 ± B6±6)R±G ± W±BAutomatic light control
sensor (IG)Ignition switch OFFBelow 1 V
CLTB (*3) ± GND1
(B6±4 ± B6±6)R±G ± W±BAutomatic light control
sensor (IG)Ignition switch ON10 to 14 V
BZR ± GND1
(B7±15 ± B6±6)LG ± W±BWireless door lock
buzzer signalBuzzer does not soundBelow 1 V
BZR ± GND1
(B7±15 ± B6±6)LG ± W±BWireless door lock
buzzer signalBuzzer sounds10 to 14 V
RLD ± GND1
(B7±26 ± B6±6)L ± W±BPower window control
(Rear LH (DOWN))Ignition switch ONBelow 1 V
RLD ± GND1
(B7±26 ± B6±6)L ± W±BPower window control
(Rear LH (DOWN))Ignition switch ON,
Rear left power window DOWN
operation
10 to 14 V
RLU ± GND1
(B7±25 ± B6±6)G±R ± W±BPower window control
(Rear LH (UP))Ignition switch ONBelow 1 V
RLU ± GND1
(B7±25 ± B6±6)G±R ± W±BPower window control
(Rear LH (UP))Ignition switch ON,
Rear left power window UP op-
eration
10 to 14 V
RRD ± GND1
(B5±20 ± B6±6)L ± W±BPower window control
(Rear RH (DOWN))Ignition switch ONBelow 1 V
RRD ± GND1
(B5±20 ± B6±6)L ± W±BPower window control
(Rear RH (DOWN))Ignition switch ON,
Rear right power window DOWN
operation
10 to 14 V
RRU ± GND1
(B5±19 ± B6±6)G±Y ± W±BPower window control
(Rear RH (UP))Ignition switch ONBelow 1 V
RRU ± GND1
(B5±19 ± B6±6)G±Y ± W±BPower window control
(Rear RH (UP))Ignition switch ON,
Rear right power window UP op-
eration
10 to 14 V
HEAD ± GND1
(B6±9 ± B6±6)G±Y ± W±BLight control switch
(HEAD)Light control switch HEADBelow 1 V
HEAD ± GND1
(B6±9 ± B6±6)G±Y ± W±BLight control switch
(HEAD)Light control switch OFF or TAIL10 to 14 V
PKB ± GND1
(B5±3 ± B6±6)LG±R ± W±BParking brake switch
signalIgnition switch ON, Parking brake
appliedBelow 1 V
PKB ± GND1
(B5±3 ± B6±6)LG±R ± W±BParking brake switch
signalIgnition switch ON, Parking brake
not applied10 to 14 V
GSWGR RAirbag sensor commu-Airbag sensor communicationGSW
(B6±16)GR±RAirbag sensor commu
nication signal
Airbag sensor communication
circuit±
OBD2
(B5±2)G±RDiagnosis signalDLC3 communication circuit±
FFOG ± GND1
(B6±13 ± B6±6)G±B ± W±BFog light switch signalHeadlight dimmer switch LOW,
Fog light switch OFFBelow 1 V

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± MPX+
MPX1 MPX1
SILAutomatic Light
Control Sensor
Wireless Door
Control Receiver
Airbag Sensor Assy
Diagnostic Bus
BEANCLTS
CLTB
CLTE
PRG
GSW
OBD2PDA DI±1888
± DIAGNOSTICSMULTIPLEX COMMUNICATION SYSTEM
2082 Author: Date:
2005 SEQUOIA (RM1146U)
SYSTEM DIAGRAM

DI±1906
± DIAGNOSTICSMULTIPLEX COMMUNICATION SYSTEM
2100 Author: Date:
2005 SEQUOIA (RM1146U)B1242
(DI±1933)
Wireless door lock tuner circuit malfunction

Wireless door lock control receiver

Wire harness

Body ECU
B1243
(DI±1935)GSW terminal circuit malfunction

Airbag sensor assembly

Wire harness

Body ECU
B1244
(DI±1937)Light sensor circuit malfunction

Automatic light control sensor

Wire harness

Body ECU
B1262
(DI±1940)A/C ECU communication stop

A/C ECU (Integration control and panel)

Wire harness

Body ECU
B1271
(DI±1943)Combination meter ECU communication stop

Combination meter

Wire harness

Body ECU
B1272
(DI±1946)Memory seat ECU communication stop
(w/ Driving position memory)
Memory seat ECU & switch

Wire harness

Body ECU
B1273
(DI±1949)Sliding roof ECU communication stop
(w/ Sliding roof)
Sliding roof ECU

Wire harness

Body ECU
B1287
(DI±1952)Back door ECU communication stop

Back door ECU

Wire harness

Body ECU
HINT:

When either DTC B1214 or B1215 is output, a DTC for another ECU communication stop may also
be output. In this case, perform troubleshooting for DTC B1214 or B1215 first. DTC B1214 or B1215
is output when a short to +B or short to ground occurs on a communication bus.

DTCs from B1221 to B1241 do not indicate that the corresponding switch is abnormal. They notify how
the switch is operating.
If the corresponding DTC is not indicated when operating a switch, there is a problem with the switch
contact.
If a DTC is indicated when not operating switches, the corresponding switch is stuck.

DI3IS±11
I27730
Instrument Panel J/B
Passenger Door ECU
(Power Window Switch) Combination Meter
Sliding Roof ECUDLC3 Body ECU
(Located behind
the instrument panel)
Driver Door ECU
(Power Window
Master Switch)
Back Door ECU
(Located inside the back door trim board) Automatic Light Control Sensor
Memory Seat ECU
& SwitchAirbag
Sensor
Assy
Power Window
Motor Front RH

Limit Switch

Pulse Switch Power Window
Motor Front LH

Limit Switch

Pulse Switch
A/C ECU
(Integration Control and Panel)
± DIAGNOSTICSMULTIPLEX COMMUNICATION SYSTEM
DI±1907
2101 Author: Date:
2005 SEQUOIA (RM1146U)
PARTS LOCATION

I26946
Airbag Sensor Assembly Body ECU
A2018
GSW16
B6GSW Instrument Panel J/B
1A7
1B3
GR±R
B
± DIAGNOSTICSMULTIPLEX COMMUNICATION SYSTEM
DI±1935
2129 Author: Date:
2005 SEQUOIA (RM1146U)
DTC B1243 GSW terminal circuit malfunction
CIRCUIT DESCRIPTION
This DTC is indicated when open or ground short of the GSW terminal is detected.
DTC No.DTC Detection ConditionTrouble Area
B1243Open or ground short of GSW circuit

Airbag sensor assembly

Wire harness

Body ECU
WIRING DIAGRAM
DI1T3±09

DI±1936
± DIAGNOSTICSMULTIPLEX COMMUNICATION SYSTEM
2130 Author: Date:
2005 SEQUOIA (RM1146U)
INSPECTION PROCEDURE
1 Check for open and short in wire harness and connector between body ECU and
airbag sensor assembly.
PREPARATION:
Disconnect connector ºA20º of the airbag sensor assembly and connector ºB6º of the body ECU.
CHECK:
Check for an open or short circuit in the harness and connector between the airbag sensor assembly and
body ECU.
OK:
There is no open or short circuit in the wire harness.
NG Repair or replace wire harness or connector.
OK
2 Check the body ECU.
PREPARATION:
Check that DTC B1243 is indicated when another body ECU in good condition is installed.
CHECK:
Check if DTC B1243 is indicated after replacing the body ECU.
OK:
DTCs B1243 is not indicated.
NG Replace the airbag sensor assembly.
OK
Replace the body ECU (Original body ECU is
failure).

I28741
SW2
SW1 GND
R19
Separate Type Amplifier
Wire Harness View:
I28745
R19
SW2
SW1 GND
Built±in Type Amplifier
Wire Harness View:
DI±1996
± DIAGNOSTICSAUDIO SYSTEM
2190 Author: Date:
2005 SEQUOIA (RM1146U)
INSPECTION PROCEDURE
NOTICE:
The vehicle is equipped with SRS (Supplemental Restraint System) such as airbags. Before servic-
ing (including removal or installation of parts), be sure to read the precautionary notice for the sup-
plemental restraint system (see page RS±1).
1 Inspect steering pad switch assy.
PREPARATION:
Disconnect the radio receiver assy connector.
CHECK:
Measure the resistance according to the value(s) in the table
below.
OK:
Symbol
(Tester connection)ConditionSpecified condition
SW1 (R19±7) ±
GND (R19±6)No switch is pushedApprox. 100 kW
SW1 (R19±7) ±
GND (R19±6)SEEK+ switch: pushApprox. 0 W
SW1 (R19±7) ±
GND (R19±6)SEEK± switch: pushApprox. 0.3 kW
SW1 (R19±7) ±
GND (R19±6)VOL+ switch: pushApprox. 1 kW
SW1 (R19±7) ±
GND (R19±6)VOL± switch: pushApprox. 3.2 kW
SW2 (R19±8) ±
GND (R19±6)No switch is pushedApprox. 100 kW
SW2 (R19±8) ±
GND (R19±6)MODE switch: pushApprox. 0 W
NG Go to step 2.
OK
Proceed to next circuit inspection shown in problem symptoms table (See page DI±1967).

DI±2000
± DIAGNOSTICSAUDIO SYSTEM
2194 Author: Date:
2005 SEQUOIA (RM1146U)
INSPECTION PROCEDURE
NOTICE:
The vehicle is equipped with SRS (Supplemental Restraint System) such as airbags. Before servic-
ing (including removal or installation of parts), be sure to read the precautionary notice for the sup-
plemental restraint system (See page RS±1).
1 Check illumination.
CHECK:
Check if the illumination for the radio receiver assy, steering pad switch assy or others (A/C switch, cigarette
lighter, etc.) comes on when the light control switch is turned to the HEAD or TAIL position.
RESULT:
Components with illuminationGo to step
Illumination comes on for all components except radio receiver assy.A
Illumination comes on for all components except steering pad switch does not
come on.B
Illumination comes on for all components except radio receiver assy, steering
pad switch, Rear heater control panel, each switch, etc.C
All illumination does not come on. (Radio receiver assy, steering pad switch,
Combination meter, Rear heater control panel, each switch, etc.)D
HINT:
If the illuminations have malfunctions, check the rheostat switch.
B Go to step 4.
C Go to step 8.
D Go to combination meter system
(See page DI±1645).
A