Toyota Sequoia (2005). Manual — part 245
–
DIAGNOSTICS
AIR SUSPENSION SYSTEM
DI–775
969
INSPECTION PROCEDURE
HINT:
Start the inspection from step 1 when using the hand–held tester and start from step 2 when not using the
hand–held tester.
1
Read value of the hand–held tester.
PREPARATION:
(a)
Connect the hand–held tester to the DLC3.
(b)
Turn the ignition switch ON, and turn the hand–held tester main switch ON.
(c)
Select the item ”HEIGHT SW DOWN” or ”HEIGHT SW UP” in the DATA LIST, and read its value dis-
played on the hand–held tester.
AIR SUSPENSION:
Item
Measurement Item / Range (Dis-
play)
Normal Condition
Diagnostic Note
HEIGHT SW DOWN
Height control switch (DOWN) /
ON or OFF
ON: Height control switch
”DOWN” button is pressed
OFF: –
–
HEIGHT SW UP
Height control switch (UP) / ON or
OFF
ON: Height control switch ”UP”
button is pressed
OFF: –
–
CHECK:
Check that the value displayed on the hand–held tester changes by pressing the height control switch ”UP”
or ”DOWN”.
OK:
Height control switch value changes.
RESULT:
NG
A
OK (When troubleshooting according to the PROBLEM SYMPTOMS TABLE)
B
OK (When troubleshooting according to the DTC chart)
C
B
Proceed to next circuit inspection shown in
problem symptoms table (See page
C
Replace suspension control ECU
(See page
).
A
F19433
3
UP Button
DOWN Button
Height Control
Switch
1 2
4 5
DI–776
–
DIAGNOSTICS
AIR SUSPENSION SYSTEM
970
2
Inspect height control switch.
PREPARATION:
Remove the height control switch connector.
CHECK:
Check continuity between each terminal of the height control
switch when the height control switch ”UP” or ”DOWN” button
is pressed.
OK:
Tester connection
Switch condition
Specification
”UP” button
2 – 3
Continuity
”DOWN” button
2 – 3
No continuity
”UP” button
2 – 4
No continuity
”DOWN” button
2 – 4
Continuity
NG
Replace height control switch.
OK
F16805
Suspension Control ECU
Wire Harness View:
S25
UPSW
DNSW
F19462
Height Control Switch Wire Harness
Side Connector Front View:
H12
E
LWS
HSW
–
DIAGNOSTICS
AIR SUSPENSION SYSTEM
DI–777
971
3
Check harness and connector (Height control switch – Suspension control ECU,
Body ground).
PREPARATION:
Disconnect the ECU connector.
CHECK:
Measure the resistance according to the value(s) in the table
below.
OK:
Tester connection
(Symbol)
Condition
Specified condition
S25–13 (UPSW) –
H12–3 (HSW)
Always
Below 1
Ω
S25–32 (DNSW) –
H12–4 (LWS)
Always
Below 1
Ω
H12–2 (E) – Body ground
Always
Below 1
Ω
S25–13 (UPSW) –
Body ground
Always
10 k
Ω
or higher
S25–32 (DNSW) –
Body ground
Always
10 k
Ω
or higher
NG
Repair or replace harness or connector.
OK
Replace suspension control ECU
(See page
).
F19449
H17
Height Control Mode
Select Switch
Suspension Control
ECU
W–B
IM
4
BR–B
3
12
S25 TD
DI–778
–
DIAGNOSTICS
AIR SUSPENSION SYSTEM
972
DTC
C1788/88 Height Control Mode Select Switch Circuit
(Test Diagnosis)
CIRCUIT DESCRIPTION
Height control can be operated or suspended by pressing the height control mode select switch.
By pressing the switch once, height control can be suspended.
By pressing the switch one more time, height control can be operated.
HINT:
The DTC is output only when the sensor signal check is done.
DTC No.
DTC Detecting Condition
Trouble Area
C1788/88
Height control mode select switch signal does not change.
Height control mode select switch
Height control mode select switch circuit
Suspension control ECU
WIRING DIAGRAM
DIDEF–01
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