2001 TOYOTA SEQUOIA DLC3 Ts

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±1053
1247 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 buzzer.
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 ºON±OFFº function of the VSC buzzer with the hand±held tester.
ItemVehicle Condition / Test DetailsDiagnostic Note
VSC / BR WARN BUZTurns VSC / BRAKE warning buzzer ON / OFFBuzzer can be heard
OK:
Buzzer sound can be heard.
OK Replace skid control ECU
(See page BR±52).
NOTICE:
When replacing the skid control ECU, perform the zero
point calibration (See page DI±897).
NG
2 Check voltage between terminal 2 of the VSC buzzer and body ground.
PREPARATION:
Remove the VSC buzzer with connectors still connected.
CHECK:
(a) Turn the ignition switch to the ON position.
(b) Measure the voltage between terminal (2) of the VSC buzzer and body ground.
OK:
Voltage: 10 to 14 V
NG Repair or replace harness or connector from
voltage supply to VSC buzzer.
OK

F19788
6
IL2
7 CANL
S12
VSC+ 6
TC 28Translate ECU
CANH11
VSC±
TC
CG
J43
J/CIG 4A55
4BP±B W
L ABS & VSC Actuator
(Skid Control ECU)
7
S1T5
T5
T5 W
L
IL2
P±B D6
Data Link Connector 3
O 13
4Sub J/B No. 4
O
AA (*) CAN1 Circuit
(*)
(*)
(*) (*)
± DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
DI±1055
1249 Author: Date:
2005 SEQUOIA (RM1146U)
Tc Terminal Circuit
CIRCUIT DESCRIPTION
Connecting terminals Tc and CG of the DLC3 causes the skid control ECU to indicate the DTC by blinking
the ABS warning light, VSC TRAC warning light and BRAKE warning light.
WIRING DIAGRAM
DI94B±04

F09678
ON
DLC3
Tc
CG (+)(±)
DI±1056
± DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
1250 Author: Date:
2005 SEQUOIA (RM1146U)
INSPECTION PROCEDURE
1 Check voltage between terminals Tc and CG of the DLC3.
PREPARATION:
Turn the ignition switch to the ON position.
CHECK:
Measure the voltage between terminals Tc and CG of the DLC3.
OK:
Voltage: 10 to 14 V
OK If ABS warning light does not blink even after Tc
and CG have been connected, the ECU may be
defective.
NG
2 With ignition switch OFF, check for open and short circuit in harness and con-
nector between skid control ECU and DLC3, DLC3 and body ground (See page
IN±35).
NG Repair or replace harness or connector.
OK
Check and replace translate ECU or skid con-
trol ECU (See page BR±52).
NOTICE:
When replacing the skid control ECU, perform the zero point calibration (See page DI±897).

D6
DataLink
Connector
F19789
ABS & VSC Actuator
(Skid Control ECU)
R±L
T5 27
TS2440
S1
12
O
IG TS
CG
4R±LR±L
R±LTS
IL1 Translate ECU
3
O
AA J43
J/C4C 4B
4A6 66 Sub J/B No.4
(*) CAN1 Circuit (*)
± DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
DI±1057
1251 Author: Date:
2005 SEQUOIA (RM1146U)
Ts Terminal Circuit
CIRCUIT DESCRIPTION
In sensor check mode (test mode), a malfunction of the speed sensor that cannot be judged when the vehicle
is stopped is judged while driving.
Transition to sensor check mode (test mode) can be performed by connecting terminals Ts and CG of the
DLC3 and turning the ignition switch from OFF to ON.
WIRING DIAGRAM
DI94A±05

F18920
DLC3
Ts
CG ON
(+) (±)
DI±1058
± DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
1252 Author: Date:
2005 SEQUOIA (RM1146U)
INSPECTION PROCEDURE
1 Check voltage between terminals Ts and CG of the DLC3.
CHECK:
(a) Turn the ignition switch to the ON position.
(b) Measure the voltage between terminals Ts and CG of the
DLC3.
OK:
Voltage: 10 to 14 V
OK If ABS warning light does not blink even after Ts
and CG are connected, the ECU may be defec-
tive.
NG
2 Check for open and short circuit in harness and connector between skid control
ECU and DLC3, DLC3 and body ground (See page IN±35).
NG Repair or replace harness or connector.
OK
Check and replace skid control ECU
(See page BR±52).
NOTICE:
When replacing the skid control ECU, perform the zero point calibration (See page DI±897).

DIDHY±01
F19696
Junction Connector
Suspension
Control ECU
Translate ECU ECM
DLC3
DI±1062
± DIAGNOSTICSCAN COMMUNICATION SYSTEM
1256 Author: Date:
2005 SEQUOIA (RM1146U)
LOCATION

DIDHZ±01
F19815
: CAN Main Bus Line
(CAN±H) DLC3
120 W
± 10%
Suspension
Control ECU ECM
: CAN Main Bus Line
(CAN±L)
: CAN Sub Bus Line
(CAN±H) : CAN Sub Bus Line
(CAN±L)120 W
± 10% Serial Communication Line
Translate ECU
*1: w/ Air Suspension System*1 *1Junction
Connector
± DIAGNOSTICSCAN COMMUNICATION SYSTEM
DI±1063
1257 Author: Date:
2005 SEQUOIA (RM1146U)
SYSTEM DIAGRAM
HINT:

The ECM uses the CAN communication system to perform DTC communication instead of the conven-
tional serial communication line (SIL).

The translate ECU outputs DTCs only via the BRAKE warning light. Therefore, the DTCs cannot be
checked on the hand±held tester display via the CAN VIM.