Toyota Sequoia (2005). Manual — part 244
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DIAGNOSTICS
AIR SUSPENSION SYSTEM
DI–771
965
INSPECTION PROCEDURE
1
Inspect courtesy light switch.
CHECK:
Check that the open door warning light comes on when any door or back door is opened and goes off when
all the doors are closed.
OK:
Courtesy light operates normally.
NG
Check open door warning light
(See page
OK
F16805
Suspension Control ECU:
DOOR
S25
I27700
Body ECU:
ACTY
B6
DI–772
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DIAGNOSTICS
AIR SUSPENSION SYSTEM
966
2
Check harness and connector (Suspension control ECU – Body ECU).
PREPARATION:
Disconnect the body ECU and suspension control ECU con-
nectors.
CHECK:
Measure the resistance according to the value(s) in the table
below.
OK:
Tester connection
(Symbol)
Condition
Specified condition
B6–20 (ACTY) –
S25–31 (DOOR)
Always
Below 1
Ω
B6–20 (ACTY) –
Body ground
Always
10 k
Ω
or higher
NG
Repair or replace harness or connector.
OK
I27702
Body ECU Wire Harness View:
B6
ACTY
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DIAGNOSTICS
AIR SUSPENSION SYSTEM
DI–773
967
3
Inspect body ECU (ACTY output).
PREPARATION:
Reconnect the body ECU and suspension control ECU connec-
tors.
CHECK:
Measure the voltage between terminal B6–20 (ACTY) of the
multiplex network body ECU and body ground when doors are
opened and closed.
OK:
Door condition
Specified condition
Each door opened
Below 1.5 V
All doors closed
10 to 14 V
NG
Replace body ECU (See page
OK
Replace suspension control ECU
(See page
).
F19448
H12
Height Control Switch
Suspension Control
ECU
IM
S25
3
13
S25
HI
LO
HSW
LWS
DNSW
32
4
2
W–B
UPSW
W
L–B
E
DI–774
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DIAGNOSTICS
AIR SUSPENSION SYSTEM
968
DTC
C1786/86 Height Control Switch Circuit
(Test Diagnosis)
CIRCUIT DESCRIPTION
Vehicle height can be chosen by pressing the height control switch.
By pressing the ”UP” side, vehicle height goes up.
By pressing the ”DOWN” side, vehicle height goes down.
HINT:
This DTC is output only when the sensor signal check is done.
DTC No.
DTC Detecting Condition
Trouble Area
C1786/86
Height control switch signal does not change.
Height control switch
Height control switch circuit
Suspension control ECU
WIRING DIAGRAM
DIDED–01
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