Toyota Sequoia (2005). Manual — part 534
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DIAGNOSTICS
MULTIPLEX COMMUNICATION SYSTEM
DI–1931
2125
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 Condition
Trouble 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
If the problem reoccurs even after replacement, replace the body ECU.
DIDFH–01
DI–1932
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DIAGNOSTICS
MULTIPLEX COMMUNICATION SYSTEM
2126
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 Condition
Trouble Area
B1241
Back 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
If the problem reoccurs even after replacement, replace the body ECU.
DI637–05
I15555
Body ECU
W2
Wireless Door Lock
Control Receiver
2
PRG
RDA
4
5
V
R–G
3
B5
PRG
RDA
B5
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DIAGNOSTICS
MULTIPLEX COMMUNICATION SYSTEM
DI–1933
2127
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 Condition
Trouble Area
B1242
Ground short of RDA circuit
Wireless door lock control receiver
Wire harness
Body ECU
WIRING DIAGRAM
DI638–10
I03347
Receiver
Body ECU
RDA
W2
B5
I03348
Body ECU
Receiver
DI–1934
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DIAGNOSTICS
MULTIPLEX COMMUNICATION SYSTEM
2128
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)
Condition
Specification
B5–4 (RDA) –
Body ground
Always
10 k
Ω
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
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.
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