TOYOTA SEQUOIA 2001 Service Repair Manual

± DIAGNOSTICSBODY CONTROL SYSTEM
DI±1729
1923 Author: Date:
2005 SEQUOIA (RM1146U)
INSPECTION PROCEDURE
HINT:
When using the hand±held tester, start the inspection from step 1 and when not using the hand±held tester,
start from step 2.
1 Check courtesy light switch using hand±held tester.
PREPARATION:
(a) Connect the hand±held tester to the DLC3.
(b) Turn the ignition switch ON.
CHECK:
According to the display on the tester, read the ºDATA LISTº.
BODY ECU:
ItemMeasurement Item/Display
(Range)Normal ConditionDiagnostic Note
D DOR CTY SWDriver door courtesy light switch/
ON or OFFON: Driver door is opened
OFF: Driver door is closed±
P DOR CTY SWFront passenger door courtesy
light switch/ON or OFF
ON: Front passenger door is
opened
OFF: Front passenger door is
closed
±
Rr DOR CTY SWRear passenger door courtesy
light switch/ON or OFF
ON: Rear passenger door is
opened
OFF: Rear passenger door is
closed
±
OK:
The indication on the tester switches between ON and OFF in accordance with the open/close
door status.
OK Proceed to next circuit inspection shown in
problem symptoms table (See page DI±1686).
NG
2 Check door courtesy light switch (See page BE±40).
NG Replace courtesy light switch.
OK

DI±1730
± DIAGNOSTICSBODY CONTROL SYSTEM
1924 Author: Date:
2005 SEQUOIA (RM1146U)
3 Check wire harness and connector between door courtesy light switch and body
ECU, door courtesy light switch and body ground (See page IN±35).
NG Repair or replace wire harness or connector.
OK
Proceed to next circuit inspection shown in
problem symptoms table
(See page DI±1686).

I18742
Body ECU
IEW±BIND 12
A17
BR
J8
J/CGR 9
1F 1D6
C6C5 Combination Meter
16
B5 Security Instrument Panel J/B
± DIAGNOSTICSBODY CONTROL SYSTEM
DI±1731
1925 Author: Date:
2005 SEQUOIA (RM1146U)
Theft deterrent indicator circuit
CIRCUIT DESCRIPTION
When the theft deterrent system is preparing to set, this circuit turns on the indicator light. When the system
has been set, it continually turns the indicator light on for 1 second and turns it off for 1 second, and thus
blinking the indicator light.
This theft deterrent indicator sends a key judgment of the immobilizer to the transponder key ECU.
WIRING DIAGRAM
DI579±09

DI±1732
± DIAGNOSTICSBODY CONTROL SYSTEM
1926 Author: Date:
2005 SEQUOIA (RM1146U)
INSPECTION PROCEDURE
HINT:
When using the hand±held tester, start the inspection from step 1 and when not using the hand±held tester,
start from step 2.
1 Check theft deterrent indicator using hand±held tester.
PREPARATION:
(a) Connect the hand±held tester to the DLC3.
(b) Turn the ignition switch ON.
CHECK:
According to the display on the tester, perform the ºACTIVE TESTº.
BODY ECU:
ItemTest DetailsDiagnostic Note
SECURITY INDICTurn security indicator light ON/OFF±
OK:
The theft deterrent indicator light flashes or goes off correctly when operating it through the
hand±held tester.
OK Proceed to next circuit inspection shown in
problem symptoms table (See page DI±1686).
NG
2 Check theft deterrent indicator (See page DI±1608).
NG Replace combination meter.
OK

± DIAGNOSTICSBODY CONTROL SYSTEM
DI±1733
1927 Author: Date:
2005 SEQUOIA (RM1146U)
3 Check wire harness and connector between theft deterrent indicator (combina-
tion meter) and body ECU, theft deterrent indicator (
combination meter) and body
ground (See page IN±35).
NG Repair or replace wire harness or connector.
OK
Proceed to next circuit inspection shown in
problem symptoms table
(See page DI±1686).

I18735
1Body ECU
T1
Theft Deterrent Horn
IA114
R±G
B71
SH R±G DI±1734
± DIAGNOSTICSBODY CONTROL SYSTEM
1928 Author: Date:
2005 SEQUOIA (RM1146U)
Theft deterrent horn circuit
CIRCUIT DESCRIPTION
During warning of the theft deterrent system, the body ECU activates the theft deterrent horn.
WIRING DIAGRAM
DI57A±10

± DIAGNOSTICSBODY CONTROL SYSTEM
DI±1735
1929 Author: Date:
2005 SEQUOIA (RM1146U)
INSPECTION PROCEDURE
HINT:
When using the hand±held tester, start the inspection from step 1 and when not using the hand±held tester,
start from step 2.
1 Check theft deterrent horn using hand±held tester.
PREPARATION:
(a) Connect the hand±held tester to the DLC3.
(b) Turn the ignition switch ON.
CHECK:
According to the display on the tester, perform the ºACTIVE TESTº.
BODY ECU:
ItemTest DetailsDiagnostic Note
SECURITY HORNTurn theft horn ON/OFFThis test is available only for vehicles equipped
with security horn.
OK:
The theft deterrent horn sounds or stops correctly when operating it through the hand±held tes-
ter.
OK Proceed to next circuit inspection shown in
problem symptoms table (See page DI±1686).
NG
2 Check theft deterrent horn (See page BE±92).
NG Replace theft deterrent horn.
OK

DI±1736
± DIAGNOSTICSBODY CONTROL SYSTEM
1930 Author: Date:
2005 SEQUOIA (RM1146U)
3 Check wire harness and connector between theft deterrent horn and body ECU,
theft deterrent horn and body ground (See page IN±35).
NG Repair or replace wire harness or connector.
OK
Proceed to next circuit inspection shown in
problem symptoms table
(See page DI±1686).

I24356
32
1J 1E W±RBody ECU
RDA ECU±B
4
52D
5
4
B5PRG B
OW±R
B5 5
IG1
BatterySHORT PIN Engine Room J/B
1
2C8
Sub J/B No. 3
3A2
3A1
RDA PRG W2
Wireless Door
Control Receiver
+B
EV
R±G 3
2 W±RInstrument Panel J/B
F10
Fusible
Link
Block
BW±R
A J43
J/C
O
A
± DIAGNOSTICSBODY CONTROL SYSTEM
DI±1737
1931 Author: Date:
2005 SEQUOIA (RM1146U)
Wireless door lock receiver circuit
CIRCUIT DESCRIPTION
The signal from the transmitter is sent to the body ECU through RDA line of the wireless door control receiver.
RDA line is diagnosed by the body ECU, check DTC also in case of the failure of the wireless function.
WIRING DIAGRAM
DI6LV±13

DI±1738
± DIAGNOSTICSBODY CONTROL SYSTEM
1932 Author: Date:
2005 SEQUOIA (RM1146U)
INSPECTION PROCEDURE
1 Check that DTC B1242 is not indicated (See page DI±1829).
OK:
DTC B1242 is not indicated.
NG Go to multiplex communication system
(See page DI±1892).
OK
2 Check wire harness and connector (PRG circuit).
PREPARATION:
Disconnect the connectors of the wireless door lock receiver and body ECU.
CHECK:
Check continuity between terminal W2±3 (PRG) of the wireless door lock receiver and terminal B5±5 (PRG)
of the body ECU.
OK:
Continuity
NG Repair or replace wire harness or connector.
OK
3 Check voltage between terminals +B and E of wireless door lock receiver.
CHECK:
Measure the voltage between terminals W2±5 (+B) and W2±1 (E) of the wireless door lock receiver.
OK:
Voltage: 10 to 14 V
NG Repair or replace harness or connector.
OK