Toyota Sequoia (2005). Manual — part 535
I26946
Airbag Sensor Assembly
Body ECU
A20
18
GSW
16
B6
GSW
Instrument Panel J/B
1A
7
1B
3
GR–R
B
–
DIAGNOSTICS
MULTIPLEX COMMUNICATION SYSTEM
DI–1935
2129
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 Condition
Trouble Area
B1243
Open or ground short of GSW circuit
Airbag sensor assembly
Wire harness
Body ECU
WIRING DIAGRAM
DI1T3–09
DI–1936
–
DIAGNOSTICS
MULTIPLEX COMMUNICATION SYSTEM
2130
INSPECTION PROCEDURE
1
Check for open and short in wire harness and connector between body ECU and
airbag sensor assembly.
PREPARATION:
Disconnect connector ”A20” of the airbag sensor assembly and connector ”B6” 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
CLTE
Body ECU
R–G
Y
1
4
3
4
3
BR
B6
B6
CLTB
CLTS
CLTE
–
DIAGNOSTICS
MULTIPLEX COMMUNICATION SYSTEM
DI–1937
2131
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 Condition
Trouble 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
–
DIAGNOSTICS
MULTIPLEX COMMUNICATION SYSTEM
2132
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:
Item
Measurement Item/Display
(Range)
Normal Condition
Diagnostic Note
ILLUMINATE RATE
Illumination rate information/
MIN: 0 MAX: 99.99
Condition value will be displayed
Normal 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
):
NG
Replace the automatic light control sensor.
OK
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