Toyota Sequoia (2005). Manual — part 491
–
DIAGNOSTICS
BODY CONTROL SYSTEM
DI–1759
1953
Illumination circuit
CIRCUIT DESCRIPTION
The body ECU and the back door ECU detect the condition of each door courtesy light switch.
FRONT COURTESY LIGHT SWITCH CONTROL:
The 2 front courtesy light switches are directly connected to the body ECU and back door ECU. If the courte-
sy light switch is turned on (a front door is opened), voltage applied to terminal ILE of the body ECU is
grounded inside the ECU and the step light, front courtesy light, etc. come on.
REAR COURTESY LIGHT SWITCH CONTROL:
The 2 rear courtesy light switches are directly connected to the body ECU and back door ECU via each cour-
tesy light. The rear courtesy light comes on when a rear door is opened.
DID9B–01
I28523
Back Door ECU
Sub J/B No. 3
ILE B11
8
BF1
8
BD2
9
W
W
W
W
J30
J/C
J29
F
M
Instrument Panel J/B
Body ECU
1G
6
1G
5
1M
10
1E
3
1G
13
1G
14
1E
8
1M
6
1J
5
ILE
B7
3
1F
10
1M
7
W
3C
3A
3A
3D
6
6
16
6
I17
Ignition Key
Cylinder Light
1
2
W
R
R
6
R
J48
R
J/C
J49
BC1
L
F
R
D13 Door Courtesy
Light Rear RH
1
2
D17 Door Courtesy
Light Switch Rear RH
2
1
W–B
BA1
6
1
2
2
IN1
R
A
A
J21
J/C
R
R
1
B–O
2
1
D8 Diode
(Interior Light No. 1)
BC1
7
R–Y
R–Y
W–B
R
W–B
W–B
R
R
R
W (*1)
W (*2)
W
R
1
2
S8 Step Light
V7 Vanity Light RH
V6 Vanity Light LH
R11 Rear Interior Light
(*4)
(*3)
To Dome Fuse
W–B
W–B
W
G–R
(*2)
(*2)
(*2)
1
2
4
d e
f
g
b c
a
R
(*2)
3
ON
Door
OFF
R
R
DI–1760
–
DIAGNOSTICS
BODY CONTROL SYSTEM
1954
WIRING DIAGRAM
(*1): w/o Sliding Roof, RSE and RSA
(*2): w/ Sliding Roof, RSE or RSA
(*3): w/ Sliding Roof w/ RSE or RSA
(*4): w/ Sliding Roof w/o RSE and RSA
I28526
d e
f
g
b c
a
D12 Door Courtesy
Light Rear LH
D9 Diode
(Interior Light No. 2)
2
1
1
2
W–B
R
BA1
7
R–Y
R–Y
D16 Door Courtesy
Light Switch Rear LH
1
W–B
(*1) (*2)
O4 O5
3
9
Overhead Module
Personal Light
Rear Interior Light
(*2)
(*1)
(*1)
(*1)
(*1)
ON
Door
OFF
O4
(*1) (*2)
O4 O5
1
13
13
G–R
(*2)
O5
10
A
J8
J/C
IE
W
(*1)
W–B
R
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DIAGNOSTICS
BODY CONTROL SYSTEM
DI–1761
1955
(*1): w/o Sliding Roof, RSE and RSA
(*2): w/ Sliding Roof, RSE or RSA
DI–1762
–
DIAGNOSTICS
BODY CONTROL SYSTEM
1956
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 illumination (interior light) using hand–held tester.
PREPARATION:
(a)
Connect the hand–held tester to the DLC3.
(b)
Turn the ignition switch ON. (Do not start the engine.)
(c)
Turn the light control switch OFF.
CHECK:
According to the display on the tester, perform the ”ACTIVE TEST”.
BODY ECU:
Item
Test Details
Diagnostic Note
ILLUMI OUTPUT
Illuminated entry system ON/OFF
–
OK:
The illumination (interior) lights turn on or off correctly when operating them through the hand–
held tester.
OK
Proceed to next circuit inspection shown in
problem symptoms table (See page
NG
2
Check illumination light (interior light system) (See page
NG
Replace defective light.
OK
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