TOYOTA SEQUOIA 2001 Service Repair Manual

± DIAGNOSTICSMULTIPLEX COMMUNICATION SYSTEM
DI±1929
2123 Author: Date:
2005 SEQUOIA (RM1146U)
DTC B1232 Jam protection pulse switch circuit on
driver door
CIRCUIT DESCRIPTION
This DTC is output while the body ECU senses switch position information through the pulse switch, which
is built into the power window motor.
If the DTC is not output when the power window operates, the following may be malfunctioning:
DTC No.DTC Detecting ConditionTrouble Area
B1232
No change in pulse switch position information for more than
2.0 seconds even if moving the glass down when limit switch is
OFF (window glass is fully closed).
Pulse switch (Built in power window motor)

Driver door ECU

Wire harness

Body ECU
HINT:
For details of inspection, see page DI±1782.
If the problem reoccurs even after replacement, replace the body ECU.
DI1T2±07

DI±1930
± DIAGNOSTICSMULTIPLEX COMMUNICATION SYSTEM
2124 Author: Date:
2005 SEQUOIA (RM1146U)
DTC B1233 Jam protection limit switch circuit on
passenger door
CIRCUIT DESCRIPTION
This DTC is output while the body ECU senses the limit position through the limit switch, which is built into
the power window motor.
If the DTC is not output, the following may be malfunctioning:
DTC No.DTC Detection ConditionTrouble Area
B1233
No change in limit switch position for more than 2.0 seconds
even if moving the glass down when limit switch is OFF
(window glass is fully closed)
Limit switch (Built in power window motor)

Passenger door ECU

Wire harness

Body ECU
HINT:
For details of inspection, see page DI±1818.
If the problem reoccurs even after replacement, replace the body ECU.
DIDFG±01

± DIAGNOSTICSMULTIPLEX COMMUNICATION SYSTEM
DI±1931
2125 Author: Date:
2005 SEQUOIA (RM1146U)
DTC B1234 Jam protection pulse switch circuit on
passenger door
CIRCUIT DESCRIPTION
This DTC is output while the body ECU senses switch position information through the pulse switch, which
is built into the power window motor.
If the DTC is not output when the power window operates, the following may be malfunctioning:
DTC No.DTC Detecting ConditionTrouble Area
B1234
No change in pulse switch position information for more than
2.0 seconds even if moving the glass down when limit switch is
OFF (window glass is fully closed).
Pulse switch (Built in power window motor)

Passenger door ECU

Wire harness

Body ECU
HINT:
For details of inspection, see page DI±1818.
If the problem reoccurs even after replacement, replace the body ECU.
DIDFH±01

DI±1932
± DIAGNOSTICSMULTIPLEX COMMUNICATION SYSTEM
2126 Author: Date:
2005 SEQUOIA (RM1146U)
DTC B1241 Body ECU switch circuit diagnosis
CIRCUIT DESCRIPTION
This DTC notifies how the switch works as follows:
If the DTC is not indicated when operating the back door power window switch or rear wiper and washer
switch, it means failure of switch contact. If the DTC is indicated when not operating the back door power
window switch or rear wiper and washer switch, it means the switch is stick. When something wrong is found
by this diagnosis, inspect each switch. Replace the switch if there is a problem, or check the wire harness
if there is no problem.
DTC No.DTC Detecting ConditionTrouble Area
B1241Back door power window switch and rear wiper and washer
switch operate normally.

Back door power window switch

Rear wiper and washer switch

Wire harness

Body ECU
HINT:
For details of inspection, see page DI±1686.
If the problem reoccurs even after replacement, replace the body ECU.
DI637±05

I15555
Body ECU W2
Wireless Door Lock
Control Receiver
2PRG
RDA 4 5
V
R±G 3
B5 PRG
RDAB5
± DIAGNOSTICSMULTIPLEX COMMUNICATION SYSTEM
DI±1933
2127 Author: Date:
2005 SEQUOIA (RM1146U)
DTC B1242 Wireless door lock tuner circuit mal-
function
CIRCUIT DESCRIPTION
This DTC is indicated when ground short of the RDA terminal is detected.
DTC No.DTC Detecting ConditionTrouble Area
B1242Ground short of RDA circuit

Wireless door lock control receiver

Wire harness

Body ECU
WIRING DIAGRAM
DI638±10

I03347
ReceiverBody ECU RDA W2
B5
I03348
Body ECU Receiver
DI±1934
± DIAGNOSTICSMULTIPLEX COMMUNICATION SYSTEM
2128 Author: Date:
2005 SEQUOIA (RM1146U)
INSPECTION PROCEDURE
1 Check wire harness and connector (Wireless door lock control receiver ± body
ECU).
PREPARATION:
Disconnect the receiver and body ECU connectors.
CHECK:
Measure the resistance according to the value(s) in the table
below.
OK:
Tester connection
(Symbol)ConditionSpecification
B5±4 (RDA) ±
Body groundAlways10 kW or higher
NG Repair or replace the wire harness.
OK
2 Check body ECU.
PREPARATION:
Reconnect the body ECU connector.
CHECK:
Check the DTC (See page DI±1904).
OK:
DTC B1242 is not indicated.
HINT:
Ignore any codes other than DTC B1242.
NG Replace the body ECU.
OK
Replace the wireless door lock control re-
ceiver.

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).

I24369
A27
Automatic Light Control
Sensor
B6 12
CLTB CLTS
CLTEBody ECU
R±GY
1 4
34
3
BRB6
B6 CLTB CLTS
CLTE
± DIAGNOSTICSMULTIPLEX COMMUNICATION SYSTEM
DI±1937
2131 Author: Date:
2005 SEQUOIA (RM1146U)
DTC B1244 Light sensor circuit malfunction
CIRCUIT DESCRIPTION
This DTC is indicated when failure of the light sensor circuit is detected.
DTC No.DTC Detecting ConditionTrouble Area
B1244
Malfunction of automatic light control sensor

Open or short in automatic light control sensor circuit
Automatic light control sensor

Wire harness

Body ECU
WIRING DIAGRAM
DI639±08

DI±1938
± DIAGNOSTICSMULTIPLEX COMMUNICATION SYSTEM
2132 Author: Date:
2005 SEQUOIA (RM1146U)
INSPECTION PROCEDURE
1 Check automatic light control sensor.
Using hand±held tester:
PREPARATION:
(a) Connect the hand±held tester to the DLC3.
(b) Turn the ignition switch ON and hand±held tester main switch ON.
BODY ECU:
ItemMeasurement Item/Display
(Range)Normal ConditionDiagnostic Note
ILLUMINATE RATEIllumination rate information/
MIN: 0 MAX: 99.99Condition value will be displayedNormal value: 0.8 ms to 22.0 ms
CHECK:
The value of the illumination rate should change in the following range when the light sensor is exposed to
the light or covered by a hand.
OK:
0.8 ms to 22.0 ms
HINT:
This is the time to be taken for the light sensor to generate one cycle of frequency according to the brightness.
When not using hand±held tester (See page BE±27):
NG Replace the automatic light control sensor.
OK