2001 TOYOTA SEQUOIA Page 18

± 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

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.

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

DI±1942
± DIAGNOSTICSMULTIPLEX COMMUNICATION SYSTEM
2136 Author: Date:
2005 SEQUOIA (RM1146U)
INSPECTION PROCEDURE
1 Check air conditioning system.
CHECK:
Check the operation of the air conditioning system.
OK:
The air conditioning system operates normally.
NG Go to air conditioning system
(See page DI±2301).
OK
2 Check wire harness (Integration control and panel ± combination meter, integra-
tion control and panel ± body ECU).
PREPARATION:
Disconnect connector ºB5º of the body ECU connector, ºI19º of the integration control and panel and connec-
tor ºC5º of the combination meter.
CHECK:
Measure the resistance according to the values in the table below.
OK:
Tester connection (Symbols)ConditionSpecified condition
C5±32 ± I19±13 (MPX±)AlwaysBelow 1 W
B5±24 (MPX2) ± I19±3 (MPX+)AlwaysBelow 1 W
C5±32 ± Body groundAlways10 kW or higher
B5±24 (MPX2) ± Body groundAlways10 kW or higher
NG Repair or replace wire harness.
OK
Replace integration control and panel.
If the problem recurs even after replacement, replace the body ECU.

± DIAGNOSTICSMULTIPLEX COMMUNICATION SYSTEM
DI±1945
2139 Author: Date:
2005 SEQUOIA (RM1146U)
INSPECTION PROCEDURE
1 Check combination meter.
CHECK:
Start the engine and check that the speed meter and tachometer operate normally.
HINT:
With this inspection, the combination meter CPU can be diagnosed if it works normally or not.
OK:
Speed meter and tachometer operate normally.
NG Go to combination system (See page DI±1610).
OK
2 Check wire harness and connector (Combination meter ± back door ECU, com-
bination meter ± integration control and panel).
PREPARATION:
Disconnect connector ºB11º of the back door ECU, connector ºC5º of the combination meter and connector
ºI19º of the integration control and panel.
CHECK:
Measure the resistance according to the values in the table below.
OK:
Tester connection (Symbols)ConditionSpecified condition
B11±2 (MPX1) ± C5±31AlwaysBelow 1 W
I19±13 (MPX±) ± C5±32AlwaysBelow 1 W
B11±2 (MPX1) ± Body groundAlways10 kW or higher
I19±13 (MPX±) ± Body groundAlways10 kW or higher
NG Repair or replace wire harness.
OK
Replace the combination meter.
If the problem recurs even after replacement, replace the body ECU.