Toyota Sequoia (2005). Manual — part 478
–
DIAGNOSTICS
BODY CONTROL SYSTEM
DI–1707
1901
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 TAILLIGHT relay 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 ”ACTIVE TEST”.
BODY ECU:
Item
Test Details
Diagnostic Note
TAIL LIGHT
Taillight ON/OFF
–
OK:
The taillights 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 TAILLIGHT relay (See page
).
NG
Replace TAILLIGHT relay.
OK
3
Check wire harness and connector between TAILLIGHT relay and body ECU, bat-
tery and TAILLIGHT relay (See page
NG
Repair or replace wire harness or connector.
OK
Proceed to next circuit inspection shown in
problem symptoms table
(See page
I24144
Body ECU
MAIN
Engine Room J/B
HEAD Relay
Instrument Panel J/B
Battery
LG–R
2D
B
1
2F
L
R–W
1
2
5
3
2F
2G
2C
B7
1G
1J
L
R–L
R–L
HRLY
8
6
1
6
1
2
(*1): w/ Daytime Running Light
(*2): w/o Daytime Running Light
LG–R
6
9
8
To Headlight RH
To Headlight LH
To DRL No.4 Relay
To DIMMER Relay
To DIMMER Relay
B
4
5
F10
FL Block
(*2)
(*2)
(*1)
(*1)
(*1)
H–LP RH (*2)
DRL (*1)
H–LP LH (*2)
(*1)
DI–1708
–
DIAGNOSTICS
BODY CONTROL SYSTEM
1902
Headlight Relay Circuit
CIRCUIT DESCRIPTION
HEAD relay will be ”ON” by operating the light control switch. The transistor which activates the HEAD relay
has two sorts: one is activated by the light control switch for fail safe and the other is activated by CPU. The
one that is activated by CPU prevents the headlight from turning off at the time of trouble with the other sys-
tem in the automatic operation circuit.
When the theft deterrent system is activated, it causes the transistor in the ECU to switch ON and OFF at
approximately 0.25 sec. intervals. This switches the HEAD relay ON and OFF, and thus flashing the head-
lights (See the wiring diagram below).
In this condition, if any of the following operations is done, the transistor in the ECU goes OFF and the HEAD
control relay switches OFF, and thus stopping the headlights flashing:
(1)
Unlock the front LH or RH door with a key.
(2)
Turn the ignition switch to ACC or ON position.
(3)
Unlock the doors with the wireless door lock control system.
(4)
Wait for approximately 60 seconds.
WIRING DIAGRAM
DI5VQ–14
–
DIAGNOSTICS
BODY CONTROL SYSTEM
DI–1709
1903
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 HEAD relay 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 ”ACTIVE TEST”.
BODY ECU:
Item
Test Details
Diagnostic Note
HEAD LIGHT
Headlight relay ON/OFF
–
OK:
The headlights 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
).
NG
Replace HEAD relay.
OK
3
Check wire harness and connector between HEAD relay and body ECU, battery
and HEAD relay (See page
NG
Repair or replace wire harness or connector.
OK
Proceed to next circuit inspection shown in
problem symptoms table
(See page
I28516
J5
J/C
Body ECU
FFOG
J50
J/C
J3
J/C
5
Instrument Panel J/B
From DIMMER Relay (*1)
FOG LIGHT Relay
FOG
1K
7
1B
9
1J
10
1L
1
3
1
2
D
D
D
1
2
F2
Front Fog
Light RH
W–B
B
1
2
P
W–B
ED
IG
ALT
F10
FL Block
8
5
B
Battery
R–W
C8 Combination Switch
Fog Light Switch
B6
13
G–B
10
LFG
BFG
11
P
F1
Front Fog
Light LH
G–W (*1)
Y–R (*2)
W
P
A
(*1): w/ Daytime Running Light
(*2): w/o Daytime Running Light
B
J2
J/C
B
B
W–B
J18
J/C
W–B
W–B
IL1
From Headlight (*2)
16
A
DI–1710
–
DIAGNOSTICS
BODY CONTROL SYSTEM
1904
Front fog light relay and switch circuit
CIRCUIT DESCRIPTION
The fog light switch is built into the combination switch.
Turning the fog light switch ON supplies power to terminal FFOG of the body ECU.
The fog lights come on when the FOG light relay is turned on.
WIRING DIAGRAM
DI6U4–14
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