Toyota Sequoia (2005). Manual — part 489
–
DIAGNOSTICS
BODY CONTROL SYSTEM
DI–1751
1945
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 headlight control 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 ”DATA LIST”.
BODY ECU:
Item
Measurement Item/Display
(Range)
Normal Condition
Diagnostic Note
AUTO LIGHT SW
Light control switch (AUTO)/ON or
OFF
ON: Light control switch position is
AUTO
OFF: Light control switch position
is not AUTO
–
HEAD LIGHT SW
Light control switch (HEAD)/ON or
OFF
ON: Light control switch position is
HEAD
OFF: Light control switch position
is not HEAD
–
TAIL LIGHT SW
Light control switch (TAIL)/ON or
OFF
ON: Light control switch position is
TAIL
OFF: Light control switch position
is not TAIL
–
OK:
The indication on the tester switches between ON and OFF in accordance with the light control
switch status.
OK
Proceed to next circuit inspection shown in
problem symptoms table (See page
NG
2
Check light control switch (See page
).
NG
Replace light control switch.
OK
DI–1752
–
DIAGNOSTICS
BODY CONTROL SYSTEM
1946
3
Check wire harness and connector between light control switch and body ECU,
light control switch and body ground (See page
).
NG
Repair or replace wire harness or connector.
OK
Proceed to next circuit inspection shown in
problem symptoms table
(See page
I03114
A27
Automatic Light
Control Sensor
CLTS
Y
R–G
BR
CLTB
CLTE
Body ECU
12
B6
4
1
3
4
B6
3
B6
CLTS
CLTB
CLTE
–
DIAGNOSTICS
BODY CONTROL SYSTEM
DI–1753
1947
Automatic light control sensor circuit
CIRCUIT DESCRIPTION
The body ECU detects the ambient light level outside the vehicle via the automatic light control sensor.
The body ECU turns the headlights ON and OFF based on the ambient light level sensed by the automatic
light control sensor.
WIRING DIAGRAM
DI1OL–28
DI–1754
–
DIAGNOSTICS
BODY CONTROL SYSTEM
1948
INSPECTION PROCEDURE
1
Check automatic light control sensor.
When using hand–held tester:
PREPARATION:
(a)
Connect the hand–held tester to the DLC3.
(b)
Turn the ignition switch and hand–held tester main switch ON.
BODY ECU:
Item
Measurement Item/Display
(Range)
Normal Condition
Diagnostic Note
ILLUMINATE RATE
Illumination rate information/
MIN: 0 MAX: 99.99
Condition value will be displayed
Normal value: 0.8 ms to 22.0 ms
–
CHECK:
The illumination rate value should change within the following range such as when the light sensor is ex-
posed to light or covered by hand.
OK:
0.8 ms to 22.0 ms
HINT:
Time needed for the light sensor to generate one cycle of frequency according to the brightness.
When not using hand–held tester (See page
):
NG
Replace automatic light control sensor.
OK
2
Check harness and connector between automatic light control sensor and body
ECU (See page
NG
Repair or replace wire harness or connector.
OK
Proceed to next inspection shown in problem
symptoms table (See page
).
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