Page 1937 of 4323
± 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
Page 1938 of 4323
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).
Page 1939 of 4323
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
Page 1940 of 4323
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
Page 1941 of 4323

± 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
Page 1942 of 4323
DI±1740
± DIAGNOSTICSBODY CONTROL SYSTEM
1934 Author: Date:
2005 SEQUOIA (RM1146U)
7 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.
Page 1943 of 4323
I18739
2
1
BUZZERLG7
IA1
EDBody ECU
W1
Wireless Door
Lock Buzzer
BZR LG
B715
W±B
A
J28
J/C
A
± DIAGNOSTICSBODY CONTROL SYSTEM
DI±1741
1935 Author: Date:
2005 SEQUOIA (RM1146U)
Wireless door lock buzzer circuit
CIRCUIT DESCRIPTION
The body ECU receives a door OPEN/CLOSE demand signal from the wireless transmitter via the wireless
door lock receiver. The ECU then sounds the wireless door lock buzzer as an answer back.
WIRING DIAGRAM
DI6LW±13
Page 1944 of 4323
DI±1742
± DIAGNOSTICSBODY CONTROL SYSTEM
1936 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 wireless door lock buzzer 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
BUZZ RESP SOUNDTurn wireless buzzer ON/OFFTurn volume to MAX. if it is a wireless buzzer
equipped vehicle.
OK:
The wireless door lock buzzer sounds normally.
OK Proceed to next circuit inspection shown in
problem symptoms table (See page DI±1686).
NG
2 Check wireless door lock buzzer (See page BE±99).
NG Replace wireless door lock buzzer.
OK