2001 TOYOTA SEQUOIA DIFF.

DI±1048
± DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
1242 Author: Date:
2005 SEQUOIA (RM1146U)
VSC OFF *1 (TRAC OFF)*2 Indicator Light, Center Diff. Lock *1
(TRAC OFF)*2 Switch Circuit
*1: Only for 4WD
*
2: Only for 2WD
CIRCUIT DESCRIPTION
This is the VSC (TRAC) control main switch. When the center diff. lock (TRAC OFF) switch is pushed on,
VSC (TRAC) indicator goes off and the VSC OFF (TRAC OFF) indicator comes on. Turn the ignition switch
OFF, and check that the VSC (TRAC) indicator comes on when turning the ignition switch to the ON position
again.
Pressing the center diff. lock switch in 2WD mode does not deactivate VSC control. *
1
DI948±04

F13991
GNDCSW*1
Center Integration Panel Assembly
CSW
*2
C3C6
DI±1050
± DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
1244 Author: Date:
2005 SEQUOIA (RM1146U)
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 Check operation of the VSC OFF (TRAC OFF) indicator light.
PREPARATION:
(a) Connect the hand±held tester to the DLC3.
(b) Turn the ignition switch to the ON position and push the hand±held tester main switch ON.
(c) Select ACTIVE TEST mode on the hand±held tester.
CHECK:
Check that ºONº and ºOFFº of the VSC OFF (TRAC OFF) indicator light can be shown on the combination
meter with the hand±held tester.
ItemVehicle Condition / Test DetailsDiagnostic Note
VSC OFF (TRAC OFF)Turns VSC OFF (TRAC OFF) indicator ON / OFFObserve combination me-
ter
OK:
VSC OFF (TRAC OFF) indicator light comes on.
NG Go to step 4.
OK
2 Check center diff. lock (TRAC OFF) switch.
PREPARATION:
Remove center integration panel assembly (See page
BO±85).
CHECK:
Measure the resistance between terminals CSW and GND of
the center diff. lock
*1
(TRAC OFF *2) switch when the center diff.
lock
*1 (TRAC OFF *2) switch is ON and OFF.
*1
: Only for 4WD
*2 : Only for 2WD
OK:
Center diff. lock (TRAC OFF) switchResistance
Press continuouslyContinuity
Release1MW or higher
NG Replace center diff. lock (TRAC OFF) switch.
OK

± DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
DI±1051
1245 Author: Date:
2005 SEQUOIA (RM1146U)
3 Check for open and short circuit in harness and connector between terminal
CSW of the translate ECU and center diff. lock (TRAC OFF) switch and body
ground (See page IN±35).
NG Repair or replace harness or connector.
OK
4 Check VSC OFF (TRAC OFF) indicator light.
See combination meter troubleshooting on page DI±1614.
NG Repair or replace combination meter
(See page DI±1610).
OK
5 Check for open and short circuit in harness and connector between terminal WT
of the translate ECU and VSC OFF (TRAC OFF) indicator light (See page
IN±35).
NG Repair or replace harness or connector.
OK
Check and replace translate ECU

F19324
2WD/4HI Switch
F19325
A GND
4LO
CPU 4WD
B TR±42
± TRANSFERONE TOUCH 2±4 SELECTOR SYSTEM
2980 Author: Date:
2005 SEQUOIA (RM1146U)
8. INSPECT 4LO (4WD and differential lock ºLOCKº) "
2WD
(a) Start the engine.
(b) Push the 4LO switch once.
(c) Check that the 4LO indicator light stays lit after blinking.
(d) Push the differential lock switch once.
(e) Check that the center differential lock indicator light stays
lit after blinking.
(f) Push the 2WD/4HI switch once.
(g) Check that the 4LO and center differential lock indicator
lights go off after the 4LO and 4WD indicators are blink-
ing.
9. INSPECT 2WD/4HI, 4LO AND DIFFERENTIAL LOCK
SWITCH CONTINUITY
(a) Remove the instrument panel finish lower panel.
(b) Inspect the continuity between each terminal.
Switch positionTester connectionSpecified condition
Diff. Lock OFFB±8 ± A±10No continuity
Diff. Lock Hold ONB±8 ± A±10Continuity
4LO OFFB±9 ± A±10No continuity
4LO Hold ONB±9 ± A±10Continuity
2WD/4HI OFFB±10 ± A±10No continuity
2WD/4HI Hold ONB±10 ± A±10Continuity
If continuity is not as specified, replace the instrument panel fin-
ish lower panel.

SA23P±03
F16856
4WD Control ECU
2WD/4HI and 4LO Switch
4WD and Center Diff. Lock
Indicator Light
(Combination Meter)
Transfer 4WD
Position Switch
Transfer L4 Position Switch
A.D.D. Actuator
Actuator Connector SA±60
± SUSPENSION AND AXLEA.D.D. CONTROL SYSTEM
3056 Author: Date:
2005 SEQUOIA (RM1146U)
A.D.D. CONTROL SYSTEM
LOCATION