2001 TOYOTA SEQUOIA ECU

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

± DIAGNOSTICSBODY CONTROL SYSTEM
DI±1739
1933 Author: Date:
2005 SEQUOIA (RM1146U)
4 Check wireless door lock receiver.
PREPARATION:
Check that malfunction disappears when another wireless door lock receiver in good condition is installed.
CHECK:
Check wireless door lock function.
OK:
The wireless door lock system operates normally.
NG Proceed to next circuit inspection shown in
problem symptoms table (See page DI±1686).
OK
Failure of the original wireless door lock re-
ceiver.
5 Check wire harness and connector (RDA circuit).
PREPARATION:
Disconnect the wireless door lock receiver connector.
CHECK:
Check continuity between terminal W2±2 (RDA) of the wireless door lock receiver and terminal B5±4 (RDA)
of the body ECU.
OK:
Continuity
NG Repair or replace harness or connector.
OK
6 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