2001 TOYOTA SEQUOIA ECU

DI±1724
± DIAGNOSTICSBODY CONTROL SYSTEM
1918 Author: Date:
2005 SEQUOIA (RM1146U)
INSPECTION PROCEDURE
1 Check rear door unlock detection switch (See page BE±79).
NG Replace door lock motor assembly.
OK
2 Check wire harness and connector between door unlock detection switch and
body ECU, door unlock detection 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).

I18736
1 22014Body ECU
HCTY
B7
IA1
AJ1
J/CL±W E3
Engine Hood
Courtesy SW
W±B
EA L±W
± DIAGNOSTICSBODY CONTROL SYSTEM
DI±1725
1919 Author: Date:
2005 SEQUOIA (RM1146U)
Engine Hood Courtesy Switch Circuit
CIRCUIT DESCRIPTION
The engine hood courtesy switch is built into the engine hood lock assembly, and is turned on when the en-
gine hood is opened and goes off when the engine hood is closed.
WIRING DIAGRAM
DI7NV±08

I00298
1 (+)
2 (±)
DI±1726
± DIAGNOSTICSBODY CONTROL SYSTEM
1920 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 engine hood courtesy 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
HOOD COURTSY SWHood courtesy switch/ON or OFF
ON: Engine hood OPEN
(Hood courtesy switch ON)
OFF: Engine hood CLOSE
(Hood courtesy switch OFF)
±
OK:
The indication on the tester switches between ON and OFF in accordance with the engine hood
courtesy switch status.
OK Proceed to next circuit inspection shown in
problem symptoms table (See page DI±1686).
NG
2 Check engine hood courtesy switch.
PREPARATION:
Disconnect the engine hood courtesy switch connector.
CHECK:
Check continuity between terminals 1 and 2 when the engine
hood lock is locked and unlocked.
OK:
Engine hood lock
conditionTester connectionSpecified condition
LOCK1 ± 2No continuity
UNLOCK1 ± 2Continuity
NG Replace engine hood courtesy switch.
OK

± 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).

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

± 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