Toyota Sequoia (2005). Manual — part 492
–
DIAGNOSTICS
BODY CONTROL SYSTEM
DI–1763
1957
3
Check wire harness and connector between each illumination light and body
ECU, each illumination light and back door ECU, each illumination light and bat-
tery (See page
NG
Repair or replace wire harness or connector.
OK
Proceed to next circuit inspection shown in
problem symptoms table
(See page
I24147
B7
HORN
HORN Relay
2
1
Body ECU
1
2D
18
HR
HORN
B5
B–Y
6
C9
Horn SW
B
5
4
F10
FL Block
H8
Horn (low)
1
1
B
B
8
2H
7
2F
5
3
W–R
W–R
19
IA1
26
Battery
H7
Horn (high)
Engine Room J/B
B
DI–1764
–
DIAGNOSTICS
BODY CONTROL SYSTEM
1958
Horn circuit
CIRCUIT DESCRIPTION
The vehicle horn sounds when the horn switch is pressed. It also sounds as an alarm for the theft deterrent
system when the body ECU detects any alert condition.
WIRING DIAGRAM
DI94T–08
–
DIAGNOSTICS
BODY CONTROL SYSTEM
DI–1765
1959
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 vehicle horn 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
VEHICLE HORN
Turn vehicle horn sound ON/OFF
–
OK:
The horn sounds or stops correctly when operating it through the hand–held tester.
OK
Proceed to next circuit inspection shown in
problem symptoms table (See page
NG
2
Check horn (See page
).
NG
Replace horn.
OK
3
NG
Replace horn switch.
OK
DI–1766
–
DIAGNOSTICS
BODY CONTROL SYSTEM
1960
4
Check horn relay (See page
NG
Replace horn relay.
OK
5
Check wire harness and connector between horn and body ECU, body ECU and
horn switch (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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