Page 2129 of 4323
± DIAGNOSTICSMULTIPLEX COMMUNICATION SYSTEM
DI±1927
2121 Author: Date:
2005 SEQUOIA (RM1146U)
DTC B1224 Door lock switch circuit on passenger
door
CIRCUIT DESCRIPTION
This DTC is output while the body ECU senses the door lock state through the door unlock detection switch,
which is built into the door lock motor.
If the DTC is output, the following may be malfunctioning:
DTC No.DTC Detecting ConditionTrouble Area
B1224Does not operate door key lock and unlock switch
Door lock control switch front RH
(Built in passenger door ECU)
Door unlock detection switch front RH
Wire harness
Body ECU
HINT:
For details of inspection, see page DI±1818.
If the problem reoccurs even after replacement, replace the body ECU.
DIDFF±01
Page 2130 of 4323
DI±1928
± DIAGNOSTICSMULTIPLEX COMMUNICATION SYSTEM
2122 Author: Date:
2005 SEQUOIA (RM1146U)
DTC B1231 Jam protection limit switch circuit on
driver 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
B1231
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)
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.
DI1T1±06
Page 2131 of 4323
± 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
Page 2132 of 4323
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
Page 2133 of 4323
± 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
Page 2134 of 4323

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
Page 2135 of 4323
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
Page 2136 of 4323
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.