2001 TOYOTA SEQUOIA VSC system

DIDI6±01
Action when unable to communicateDTC detection
(Driver detectable)
Suspension
Control ECUVSC/TRC function stops
[When unable to communicate with ECM]
Function stops (Vehicle height cannot be changed until the ignition
switch is turned off)
[When unable to communicate with Translate ECU]
Vehicle height is maintained at the normal level until the ignition
switch is turned off. If communication is still impossible even after
the ignition switch is turned on again, the same height is maintained.Not detectable
( )
Not detectable
(VSC warning lamp
comes on)
Detectable
(Only DTCs are stored) ECMTranslate ECU
Suspension Control ECU
Rx
TxTx
Rx
Tx TxTx
Rx

ECM
Translate ECU DI±1074
± DIAGNOSTICSCAN COMMUNICATION SYSTEM
1268 Author: Date:
2005 SEQUOIA (RM1146U)
FAIL±SAFE CHART
1. FAIL±SAFE FUNCTION
(a) When communication fails in any of the CAN bus lines (communication lines) due to a short circuit or
any other cause, the fail±safe function, which is specified for each system, operates to prevent the
system from malfunctioning.
(b) Effects on each system when communication is impossible are as follows.
HINT:

Rx: Reception from each ECU.

Tx: Transmission to each ECU.

I24838
(4)(1)
(3)
I24838
(5)
(1)
(3)
DI±1540
± DIAGNOSTICSCRUISE CONTROL SYSTEM
1734 Author: Date:
2005 SEQUOIA (RM1146U)
(d) Inspect the CANCEL function.
(1) Push the ON±OFF button on.
(2) Drive at the required speed (40 km/h (25 mph) or
higher).
(3) Push the cruise control main switch to ±/SET.
(4) When doing any one of the following, check that the
cruise control system deactivates and that the nor-
mal driving mode is reset.

Depressing the brake pedal

Moving the shift lever to any position except
D

Pushing the ON±OFF button off

Pulling the cruise control main switch to CAN-
CEL
Reference: Cruise control will deactivate if VSC starts op-
eration while driving.
(e) Inspect the RES (RESUME) function.
(1) Push the ON±OFF button on.
(2) Drive at the required speed (40 km/h (25 mph) or
higher).
(3) Push the cruise control main switch to ±/SET.
(4) When doing any one of the following, check that the
cruise control system deactivates and that the nor-
mal driving mode is reset.

Depressing the brake pedal

Moving the shift lever to any position except
D

Pulling the cruise control main switch to CAN-
CEL
(5) After pushing the cruise control main switch to
+/RES while driving, check that the vehicle resumes
the speed set prior to the cancellation.

DID8Q±01
DI±1608
± DIAGNOSTICSCOMBINATION METER SYSTEM
1802 Author: Date:
2005 SEQUOIA (RM1146U)
SYSTEM DESCRIPTION
1. METER GAUGE AND WARNING/INDICATOR
GAUGE:
ItemDetail
SpeedometerVehicle speed sensor (Direct line).
TachometerECM transmits engine speed to the meter to display.
ODO/TRIP MeterCombination meter assy.
FuelDisplays a fuel level according to a signal from the fuel sender gauge (Direct line).
Water TemperatureDisplays engine coolant temperature according to a signal from the ECM (BEAN).
Oil PressureReceives a signal from the oil pressure sender (Direct line).
Volt MeterDisplays vehicle voltage according to a voltage from the IG terminal (Direct line).
WARNING/INDICATOR:
HINT:
Combination meter bulb check is performed for 3 seconds after the ignition switch is turned ON.
ItemDetailList of indicators available for
bulb check
O/D OFFReceives a signal from the ECM (Direct line)±
TURNTurns signal switch ON (Direct line)±
BEAMReceives a signal from the body ECU (*1), Displays a signal received from the
dimmer switch (*2) (Direct line)±
SECURITYReceives a set signal from the transponder key ECU and body ECU (Direct line)±
CHARGEReceives a malfunction signal from the alternator (Direct line)
AIR BAGReceives a malfunction signal from the airbag sensor center (Direct line)
D SEAT BELTReceives the driver seat belt signal (Unfastened) from the seat belt inner front LH
(Direct line)±
DOOROpen door indicator comes on when a signal is received from the ECU (BEAN)
from each door±
A/T OIL TEMP.Warning is displayed when the oil temperature is high (Direct line)
BRAKEComes on when the parking brake switch is on or the brake fluid level warning
switch is on (Direct line)
MIL (CHECK ENGINE)Receives a malfunction signal from the ECM (Direct line)
FUEL WARNINGReceives the fuel empty signal from the fuel sender gauge (Direct line)±
ABSReceives a malfunction signal from the skid control ECU (Direct line)
WASHERWarning is displayed when the washer level is low (Direct line)±
CRUISEReceives a CRUISE on signal or malfunction signal from the ECM (Direct line)±
VSC TRACReceives a malfunction signal from the skid control ECU (Direct line)
VSC (TRAC) OFFReceives a malfunction signal from the translate ECU (Direct line)
SLIPReceives a malfunction signal from the translate ECU (Direct line)
4HIReceives a 4HI signal from the 4WD control ECU (Direct line)±
CTR DIF LOCKReceives a DIF LOCK signal from the 4WD control ECU (Direct line)±
A/T PReceives a P signal from the park/neutral position switch (Direct line)±
A/T NReceives an N signal from the park/neutral position switch (Direct line)±
A/T DReceives a D signal from the park/neutral position switch (Direct line)±
A/T 3Receives a 3 signal from the park/neutral position switch (Direct line)±
A/T 2Receives a 2 signal from the park/neutral position switch (Direct line)±
A/T LReceives an L signal from the park/neutral position switch (Direct line)±

± DIAGNOSTICSCOMBINATION METER SYSTEM
DI±1615
1809 Author: Date:
2005 SEQUOIA (RM1146U) Seat belt warning lamp for driver's seat does not operate.
Refer to troubleshooting proceduresDI±1650
SLIP warning light does not come on.
1. SLIP warning light circuit
2. Wire harness and connector
3. Combination meter assy
4. Skid control ECUDI±1041
±
IN±35
IN±35
INDICATOR LIGHTS:
SymptomSuspected AreaSee page
Turn indicator light does not come on.
1. Turn signal flasher relay
2. Wire harness or connector
3. Combination meter assyBE±36
±
IN±35
High beam indicator light does not come on.
1. Headlight dimmer switch (*1)
Headlight dimmer switch circuit (*2)
2. Wire harness or connector
3. Combination meter assyBE±27
DI±1755
±
IN±35
Washer level indicator light does not come on.
1. Washer level warning switch
2. Wire harness or connector
3. Combination meter assyBE±49
±
IN±35
Tire pressure indicator light does not come on.
1. Tire pressure monitor ECU
2. Wire harness or connector
3. Combination meter assyDI±873
±
IN±35
CRUISE main indicator light does not come on.
1. CRUISE main indicator light circuit
2. Cruise main control switch circuit
3. Wire harness or connector
4. Combination meter assyDI±1557
DI±1561
±
IN±35
VSC OFF indicator light does not come on.1. VSC OFF indicator light circuit
2. Combination meter assyDI±1048
IN±35
VSC TRAC indicator light does not come on.1. VSC TRAC indicator light circuit
2. Combination meter assyDI±1027
IN±35
Security indicator light does not come on.1. Security indicator light circuit
2. Combination meter assyDI±1731
IN±35
4HI indicator light does not come on.
1. Wire harness and connector
2. Combination meter assy
3. 4WD control ECU±
IN±35
IN±35
4LO indicator light does not come on.
1. Wire harness and connector
2. Combination meter assy
3. 4WD control ECU±
IN±35
IN±35
CTR DIF LOCK indicator light does not come on.
1. Wire harness and connector
2. Combination meter assy
3. 4WD control ECU±
IN±35
IN±35
Height control indicator lamp does not come on.1. Height control indicator lamp circuit
2. Combination meter assyDI±785
IN±35
Height control manual indicator lamp does not come on.1. Height control manual indicator lamp circuit
2. Combination meter assyDI±789
IN±35
A/T indicator light does not come on.
1. Park/neutral position switch circuit
2. Wire harness and connector
3. Combination meter assyDI±576
±
IN±35
*1: w/o Day time running light
*2: w/ Day time running light
OTHERS:
SymptomSuspected AreaSee page
All buzzers (key reminder, seat belt) do not operate.Combination meter assyIN±35

± DIAGNOSTICSCOMBINATION METER SYSTEM
DI±1619
1813 Author: Date:
2005 SEQUOIA (RM1146U) C5±37 ± Body ground
W±R ± Body
groundA/T shift position signal
(D)A/T D indicator ON10 to 14 V
C5±38 ± Body groundL ± Body groundA/T shift position signal
(3)A/T 3 indicator OFFBelow 1 V
C5±38 ± Body groundL ± Body groundA/T shift position signal
(3)A/T 3 indicator ON10 to 14 V
C5±39 ± Body groundLG ± Body
groundA/T shift position signal
(2)A/T 2 indicator OFFBelow 1 V
C5±39 ± Body groundLG ± Body
groundA/T shift position signal
(2)A/T 2 indicator ON10 to 14 V
C5±40 ± Body groundB±R ± Body
groundRSCA OFF signalRSCA OFF indicator light OFFBelow 1 V
C5±40 ± Body groundB±R ± Body
groundRSCA OFF signalRSCA OFF indicator light ON8 to 14 V
C6±1 ± Body groundW±R ± Body
groundSLIP signalSLIP indicator light ONBelow 1 V
C6±1 ± Body groundW±R ± Body
groundSLIP signalSLIP indicator light OFF10 to 14 V
C6±2 ± Body groundR±G ± Body
groundVSC OFF signal (*1)
TRAC OFF signal (*5)VSC OFF indicator light ON (*1)
TRAC OFF indicator light ON (*5)Below 1 V
C6±2 ± Body groundR±G ± Body
groundVSC OFF signal (*1)
TRAC OFF signal (*5)VSC OFF indicator light OFF (*1)
TRAC OFF indicator light OFF (*5)10 to 14 V
C6±3 ± Body groundP±L ± Body
groundTRAC signalVSC/TRAC indicator light ONBelow 1 V
C6±3 ± Body groundP±L ± Body
groundTRAC signalVSC/TRAC indicator light OFF10 to 14 V
C6±4 ± Body groundBR±Y ± Body
groundCTR DIFF LOCK signalCTR DIFF LOCK indicator light ONBelow 1 V
C6±4 ± Body groundBR±Y ± Body
groundCTR DIFF LOCK signalCTR DIFF LOCK indicator light OFF10 to 14 V
C6±5 ± Body groundY±B ± Body
ground4HI signal4HI indicator ONBelow 1 V
C6±5 ± Body groundY±B ± Body
ground4HI signal4HI indicator OFF10 to 14 V
C6±6 ± Body groundG±W ± Body
ground4LO signal4LO indicator ONBelow 1 V
C6±6 ± Body groundG±W ± Body
ground4LO signal4LO indicator OFF10 to 14 V
C6±8 ± Body groundY ± Body groundCharge signalEngine runningBelow 1 V
C6±8 ± Body groundY ± Body groundCharge signalEngine stopped10 to 14 V
C6±10 ± Body groundY±R ± Body
groundGround (Speed)AlwaysBelow 1 V
C6±11 ± Body groundY±B ± Body
groundGround (Fuel sender
gauge)AlwaysBelow 1 V
C6±12 ± Body groundBR ± Body
groundGroundAlwaysBelow 1 V
C6±13 ± Body groundLG ± Body
groundHeight control indicator
lamp signal (MAN.)Height control indicator lamp MAN.
Indicator light ONBelow 1 V
C6±13 ± Body groundLG ± Body
groundHeight control indicator
lamp signal (MAN.)Height control indicator lamp MAN.
Indicator light OFF10 to 14 V

I27707
C6±21
C6±8
(*4) C5±15
C5±18
C5±2
C5±14
C5±19
C5±13
C6±1
C6±2
C6±3
C5±20ABS
CHARGE
A/T OIL TEMP
CHECK E/G
4LO O/D OFF
A/T L
WASHER
SLIP
VSC OFF
VSC TRAC
4HI CRUISE
ONE STEP
DIMMERC6±24
C6±5
C6±6
C6±4
C5±40TIRE PRS
CTR DIFF LOCK
RSCA OFF
SECURITY
P
R
NC5±16
C5±17
C5±34
C5±35
C5±36
C5±37
C5±38
C5±39
C6±17 (*5)
C6±18 (*6)
C5±33
C6±19 TURN (L) TURN (R) BEAM3
2 D
*4: 4WD *5: w/o Daytime Running Light *6: w/ Daytime Running LightONE STEP
DIMMERRSCA OFF
± DIAGNOSTICSCOMBINATION METER SYSTEM
DI±1623
1817 Author: Date:
2005 SEQUOIA (RM1146U)

BR1NL±04
BR±54
± BRAKEABS & VSC ACTUATOR
3221 Author: Date:
2005 SEQUOIA (RM1146U)
INSTALLATION
Installation is in the reverse order of removal (See page BR±51).
HINT:

After installation, fill the brake reservoir with brake fluid and bleed brake system (See page BR±4).

Check for leaks.
NOTICE:
In case of replacing the skid control ECU, perform the zero point calibration of the steering angle,
master cylinder pressure, yawrate and deceleration sensors (See page DI±897).

05_SEQUOIA_U (L/O 0408)
167
2005 SEQUOIA from Aug. '04 Prod. (OM34424U)
(f) Low Fuel Level Warning Light
This light comes on when the fuel level
in the tank becomes nearly empty. Fill up
the tank as soon as possible.
On inclines or curves, due to the move-
ment of fuel in the tank, the low fuel level
warning light may come on earlier than
usual.
(g) ªABSº Warning Light
The light comes on when the ignition key
is turned to the ªONº position. If the anti±
lock brake system and the brake assist
system work properly, the light turns off
after a few seconds. Thereafter, if either
of the systems malfunctions, the light
comes on again.
When the ªABSº warning light is on (and
the brake system warning light is off), the
anti±lock brake system, the brake assist
system, the traction control system (two±
wheel drive vehicles), the active traction
control system (four±wheel drive vehicles)
and the vehicle stability control system do
not operate, but the brake system still
operates conventionally.When the ªABSº warning light is on (and
the brake system warning light is off), the
anti±lock brake system does not operate
so that the wheels could lock up during
a sudden braking or braking on slippery
road surfaces.
If either of the following conditions
occurs, this indicates a malfunction
somewhere in the components moni-
tored by the warning light system. Con-
tact your Toyota dealer as soon as
possible to service the vehicle.

The light does not come on when the
ignition key is turned to the ªONº posi-
tion, or remains on.

The light comes on while you are dri-
ving.
A warning light turning on briefly during
operation does not indicate a problem.
CAUTION
If the ªABSº warning light remains on
together with the brake system warn-
ing light, immediately stop your ve-
hicle at a safe place and contact your
Toyota dealer.
In this case, not only the anti±lock
brake system will fail but also the
vehicle will become extremely unsta-
ble during braking.
(h) ªVSC TRACº Warning Light
This light warns that there is a problem
somewhere in the vehicle stability control
system and traction control system (two±
wheel drive models) or active traction con-
trol system (four±wheel drive models).
The light will come on when the ignition
key is turned to ªONº and will go off after
a few seconds.
If the light comes on while driving, the
system does not work. However, as con-
ventional braking operates when applied,
there is no problem to continue your driv-
ing.