Page 969 of 4323
F19446
W
41G±Y1
4A11
4AG±Y27
S25 STP
BatteryB ALT
85 W 1
1L STOP 2
1FS14
Stop Light Switch
Sub J/B No. 4Suspension Control
ECU
Instrument Panel J/BF10
Fusible Link Block
1L
± DIAGNOSTICSAIR SUSPENSION SYSTEM
DI±767
961 Author: Date:
2005 SEQUOIA (RM1146U)
DTC C1782/82 Stop Light Switch Circuit (Test Diagnosis)
CIRCUIT DESCRIPTION
When the brake pedal is depressed, the stop light comes on and the signal is input to the STP terminal of
the suspension control ECU.
HINT:
This DTC is output only when the sensor signal check is done.
DTC No.DTC Detecting ConditionTrouble Area
C1782/82The signal from the stop light switch assy does not change.
Stop light switch assy
Stop light switch circuit
Suspension control ECU
WIRING DIAGRAM
DIDE7±01
Page 970 of 4323
F16805
Wire Harness View:
S25
STP
DI±768
± DIAGNOSTICSAIR SUSPENSION SYSTEM
962 Author: Date:
2005 SEQUOIA (RM1146U)
INSPECTION PROCEDURE
1 Inspect stop light.
CHECK:
Check that the stop light comes on when the brake pedal is depressed and goes off when the brake pedal
is released.
OK:
Stop light operates normally.
NG Go to step 3.
OK
2 Inspect suspension control ECU.
PREPARATION:
Disconnect the ECU connector.
CHECK:
Measure the voltage between terminal S25±27 (STP) of the
suspension control ECU and body ground when the stop light
switch is ON and OFF.
OK:
Switch conditionSpecified condition
Brake pedal depressed (ON)10 to 14 V
Brake pedal released (OFF)Below 1 V
NG Repair or replace harness connector.
OK
Replace suspension control ECU
(See page IN±35).
Page 971 of 4323
I21525
Free Pushed in
F16805
Wire Harness View:
S25
STP
± DIAGNOSTICSAIR SUSPENSION SYSTEM
DI±769
963 Author: Date:
2005 SEQUOIA (RM1146U)
3 Inspect stop light switch assy.
PREPARATION:
Disconnect the stop light switch assy connector.
CHECK:
Check resistance between terminals 1 and 4 of the stop light
switch assy.
OK:
Switch conditionTester connectionSpecified condition
Switch pin free1 ± 4Below 1 W
Switch pin pushed in1 ± 410 kW or higher
NG Replace stop light switch assy.
OK
4 Inspect suspension control ECU.
PREPARATION:
Disconnect the ECU connector.
CHECK:
Measure the voltage between terminal S25±27 (STP) of the
suspension control ECU and body ground when the stop lamp
switch is ON and OFF.
OK:
Switch conditionSpecified condition
Brake pedal depressed (ON)10 to 14 V
Brake pedal released (OFF)Below 1 V
NG Repair or replace harness connector.
OK
Replace suspension control ECU
(See page IN±35).
Page 972 of 4323
F19447
Body ECUSuspension Control
ECU
ACTY20
B631
S25 DOOR R DI±770
± DIAGNOSTICSAIR SUSPENSION SYSTEM
964 Author: Date:
2005 SEQUOIA (RM1146U)
DTC C1783/83 Door Courtesy Switch Circuit
(Test Diagnosis)
CIRCUIT DESCRIPTION
The door courtesy light switch turns on when the door is opened and turns off when the door is closed.
The signal is sent from the body ECU and the back door ECU into the DOOR terminal of the suspension
control ECU when any door is open.
HINT:
This DTC is output only when the sensor signal check is done.
For courtesy light switch connection, see the system diagram on page DI±698.
DTC No.DTC Detecting ConditionTrouble Area
C1783/83Door courtesy light switch signal does not change.
Door courtesy light switch
Back door lock assy (Back door courtesy light switch)
Door courtesy light switch circuit
Body ECU
Back door ECU
Suspension control ECU
WIRING DIAGRAM
DIDEA±01
Page 973 of 4323
± DIAGNOSTICSAIR SUSPENSION SYSTEM
DI±771
965 Author: Date:
2005 SEQUOIA (RM1146U)
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 DI±1608).
OK
Page 974 of 4323
F16805
Suspension Control ECU:
DOORS25
I27700
Body ECU:
ACTYB6
DI±772
± DIAGNOSTICSAIR SUSPENSION SYSTEM
966 Author: Date:
2005 SEQUOIA (RM1146U)
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)ConditionSpecified condition
B6±20 (ACTY) ±
S25±31 (DOOR)AlwaysBelow 1 W
B6±20 (ACTY) ±
Body groundAlways10 kW or higher
NG Repair or replace harness or connector.
OK
Page 975 of 4323
I27702
Body ECU Wire Harness View:
B6
ACTY
± DIAGNOSTICSAIR SUSPENSION SYSTEM
DI±773
967 Author: Date:
2005 SEQUOIA (RM1146U)
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 conditionSpecified condition
Each door openedBelow 1.5 V
All doors closed10 to 14 V
NG Replace body ECU (See page IN±35).
OK
Replace suspension control ECU
(See page IN±35).
Page 976 of 4323
F19448
H12
Height Control SwitchSuspension Control
ECU
IMS25 313
S25 HI
LOHSW
LW S
DNSW 32
4 2 W±BUPSW
W L±B
E DI±774
± DIAGNOSTICSAIR SUSPENSION SYSTEM
968 Author: Date:
2005 SEQUOIA (RM1146U)
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 ºUPº side, vehicle height goes up.
By pressing the ºDOWNº side, vehicle height goes down.
HINT:
This DTC is output only when the sensor signal check is done.
DTC No.DTC Detecting ConditionTrouble Area
C1786/86Height control switch signal does not change.
Height control switch
Height control switch circuit
Suspension control ECU
WIRING DIAGRAM
DIDED±01