Page 2137 of 4323
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
Page 2138 of 4323
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).
Page 2139 of 4323
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
B1244Malfunction of automatic light control sensor
Open or short in automatic light control sensor circuitAutomatic light control sensor
Wire harness
Body ECU
WIRING DIAGRAM
DI639±08
Page 2140 of 4323
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
Page 2141 of 4323
± DIAGNOSTICSMULTIPLEX COMMUNICATION SYSTEM
DI±1939
2133 Author: Date:
2005 SEQUOIA (RM1146U)
2 Check wire harness and connector between automatic light control sensor and
body ECU.
PREPARATION:
Disconnect connector ºA27º of the automatic light control sensor and connector ºB6º of the body ECU.
CHECK:
Measure the resistance according to the values in the table below.
OK:
Tester connection (Symbols)ConditionSpecified condition
A27±4 ± B6±12 (CLTS)AlwaysBelow 1 W
A27±1 ± B6±4 (CLTB)AlwaysBelow 1 W
A27±3 ± B6±3 (CLTE)AlwaysBelow 1 W
A27±4 ± Body groundAlways10 kW or higher
A27±1 ± Body groundAlways10 kW or higher
A27±3 ± Body groundAlways10 kW or higher
NG Repair or replace wire harness or connector.
OK
Replace the body ECU.
Page 2142 of 4323
DI±1940
± DIAGNOSTICSMULTIPLEX COMMUNICATION SYSTEM
2134 Author: Date:
2005 SEQUOIA (RM1146U)
DTC B1262 A/C ECU communication stop
CIRCUIT DESCRIPTION
This DTC is indicated when communication fails between the integration control and panel and the body
ECU.
DTC No.DTC Detecting ConditionTrouble Area
B1262No communication from integration control and panel for more
than 10 seconds.A/C ECU (Integration control and panel)
Wire harness
Body ECU
DIDFI±01
Page 2143 of 4323
I28469
I19
Integration Control
and Panel
Body ECU
I18
Ignition SW Combination Meter
F10
FL Block
To Ignition
Switch J43
J/C
IG BatteryDOME ALTAM1CIG
ACC
AM1
Short Pin
J/CMPX±
ACC
+B MPX+ MPX2
IG+
GND C5
B5
J15
1E
1L
1JJ15
1E1C
1C
2D 2C3A 3E
3A 3E
O BR WW±L
O BRPP
P
R
R±L
R±L L±Y LG±B
DD 32
2413
3
11
31 1
1
8 6 20
1
52 8 5
4
13
6 6 16
151
2
10 Instrument Panel J/B
Engine Room J/BSub J/B No.3
AA
± DIAGNOSTICSMULTIPLEX COMMUNICATION SYSTEM
DI±1941
2135 Author: Date:
2005 SEQUOIA (RM1146U)
WIRING DIAGRAM
Page 2144 of 4323

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.