Page 1929 of 4323
± DIAGNOSTICSBODY CONTROL SYSTEM
DI±1727
1921 Author: Date:
2005 SEQUOIA (RM1146U)
3 Check harness and connector between body ECU and switch, switch and body
ground (See page IN±35).
NG Repair or replace harness or connector.
OK
Proceed to next circuit inspection shown in
problem symptoms table
(See page DI±1686).
Page 1930 of 4323
I28518
1
11
1R±WBody ECU
B7 12
DCTYPCTY RRCY RLCY
B522 B58 B77
R±W
R±W
R±W
LG±B B±O
LG±B
D14
Door Courtesy Light
Switch Front LH D9
DIODE
D16
Door Courtesy
Light Switch
Rear LH
D17
Door
Courtesy
Light Switch
Rear RHD15
Door Courtesy Light
Switch Front RH 2
3
B±O23 D8
DIODEJ/C
J30 J29KD
J/C
J45 J44C
J
GN
J/C
NG J45 J44J/C
J30 J29
GR±RGR±R DI±1728
± DIAGNOSTICSBODY CONTROL SYSTEM
1922 Author: Date:
2005 SEQUOIA (RM1146U)
Door courtesy light switch circuit
CIRCUIT DESCRIPTION
The door courtesy light switch is turned ON when the door is opened and is turned OFF when the door is
closed.
WIRING DIAGRAM
DI577±10
Page 1931 of 4323

± 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
Page 1932 of 4323
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).
Page 1933 of 4323
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
Page 1934 of 4323
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
Page 1935 of 4323
± 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).
Page 1936 of 4323
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