Toyota Sequoia (2005). Manual — part 479
–
DIAGNOSTICS
BODY CONTROL SYSTEM
DI–1711
1905
INSPECTION PROCEDURE
1
Check FOG LIGHT relay (See page
).
NG
Replace FOG LIGHT relay.
OK
2
Check fog light switch (See page
NG
Replace fog light switch.
OK
3
Check wire harness and connector between FOG LIGHT relay and fog light
switch, FOG LIGHT relay and battery, FOG LIGHT relay and body ground
(See page
).
NG
Repair or replace wire harness or connector.
OK
4
Check wire harness and connector between fog light switch and body ECU
(See page
).
NG
Repair or replace wire harness or connector.
OK
Proceed to next circuit inspection shown in
problem symptoms table
(See page
DI–1712
–
DIAGNOSTICS
BODY CONTROL SYSTEM
1906
Daytime running light relay circuit
CIRCUIT DESCRIPTION
Power is supplied to the DIMMER and DRL No. 4 relays when the HEAD relay is turned on.
The HEAD relay turns on by turning the light control switch to the TAIL or HEAD position.
The DIMMER relay turns on by turning the headlight dimmer switch to the LOW, HIGH, or FLASH position.
The body ECU determines the light control switch position and turns on the DRL No. 4 and DIMMER relays.
The DRL No. 4 relay and the daytime running light resistor are parallel circuits. If the light control switch is
OFF, electric current flows to body ground via the resistor instead of driving the DRL No. 4 relay. The head-
lights come on and dim according to the amount of resistance.
DI6M3–11
I28771
3
2
2
1
2
Body ECU
2
2
L
1
G–W
2
2
2
Engine Room R/B No. 2
R–W
2
1
2
1
2
1
R–L
A
To Body ECU
(HEAD Relay Circuit)
B7
R
2F
B
5
ED
MAIN
HEAD Relay
DRL
IA1
17
Battery
F10
FL Block
J1
J/C
W–L
W–L
R–L
R–W
R–W
W–B
G–W
3
2
1
W–L
W
1
2
A
A
A
2
2
2
2
1
2
3
5
B7
W–B
R
W–B
R–L
L
L
5
3
2
1
5
3
1
2
1
2
1
2G
2C
2D
1
6
4
A
2
2
2
2
2
DIMMER Relay
Engine Room R/B No. 2
H5
Headlight
LH
16
17
C
H–LP RH
H–ON
DIM
DRL No. 4 Relay
J4
J/C
C
H6
Headlight RH
H–LP LH
H–LP RL
H–LP LL
IA1
18
W–B
4
Engine Room R/B No. 2
Engine Room J/B
6
LG–R
R–B
J2 J/C
W–L
D1 Daytime Running
Light Resistor
J5
J/C
A
EA
–
DIAGNOSTICS
BODY CONTROL SYSTEM
DI–1713
1907
WIRING DIAGRAM
DI–1714
–
DIAGNOSTICS
BODY CONTROL SYSTEM
1908
INSPECTION PROCEDURE
1
Check DRL No. 4 relay and DIMMER relay (See page
).
NG
Replace DRL No. 4 relay and DIMMER relay.
OK
2
Check wire harness and connector (Daytime running light circuit)
(See page
).
NG
Repair or replace wire harness or connector.
OK
Proceed to next circuit inspection shown in
problem symptoms table
(See page
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