dlc3 LEXUS LS430 2003 Factory Owner's Guide

Fig. 131: Skid Control Buzzer Wiring Diagram
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
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.PERFORM ACTIVE TEST BY HAND-HELD TESTER (SKID CONTROL BUZZER)
a. Connect the hand-held tester to the DLC3.
b. Start the engine.
c. Select the item "VSC/BR WARN BUZ" in the ACTIVE TEST and operate the skid control buzzer
on the han
d-held tester.

Standard:
TESTER CONNECTION SPECIFIED CONDITION
NG: REPAIR OR REPLACE HARNESS OR CONNECTOR
OK: REPLACE ABS & TRACTION ACTUATOR ASSY (SEE REPLACEMENT
)
CIRCUIT DESCRIPTION
Connecting terminals TC and CG of the DLC3 causes the ECU to display the DTC by blinking the ABS
warning light.
WIRING DIAGRAM
Tester ConnectionSpecified Condition
S42-30 (BZ) - Body ground1 Mohms or higher

Fig. 134: TC And CG Terminal Wiring Diagram
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
INSPECTION PROCEDURE
1.INSPECT DLC3 TERMINAL VOLTAGE (DLC3 TERMINAL VOLTAGE)
a. Turn the ignition switch to the ON position.
b. Measure the voltage according to the value (s) in the table below.
Standard:
TESTER CONNECTION SPECIFIED CONDITION
NG: GO TO STEP 3
Tester ConnectionSpecified Condition
D1-13 (TC) - Body ground10 to 14 V

Fig. 135: Identifying DLC3 Terminals (1 Of 3)
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
OK: Go to next step
2.CHECK CAN COMMUNICATION SYSTEM
a. Is the DTC output for CAN communication system?
Result:
DTC OUTPUT DESCRIPTION
B: REPAIR CIRCUIT INDICATED BY OUTPUT CODE (SEE DIAGNOSTIC TROUBLE CODE
CHART )
A: REPLACE ABS & TRACTION ACTUATOR ASSY (SEE REPLACEMENT
)
DTC is not outputA
DTC is outputB

Fig. 136: Identifying DLC3 Terminals (2 Of 3)
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

OK: Go to next step
4.INSPECT HARNESS AND CONNECTOR (DLC3 - BODY GROUND)
a. Measure the resistance according to the value (s) in the table below.
Standard:
TESTER CONNECTION SPECIFIED CONDITION
NG: REPAIR OR REPLACE HARNESS OR CONNECTOR
Fig. 137: Identifying DLC3 Terminals (3 Of 3)

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
OK: Go to next step
5.CHECK CAN COMMUNICATION SYSTEM
a. Is the DTC output for CAN communication s
ystem?
Tester ConnectionSpecified Condition
D1-4 (CG) - Body ground)Below 1 ohms

Result:
DTC OUTPUT DESCRIPTION
B: REPAIR CIRCUIT INDICATED BY OUTPUT CODE (SEE DIAGNOSTIC TROUBLE CODE
CHART )
A: REPLACE ABS & TRACTION ACTUATOR ASSY (SEE REPLACEMENT
)
CIRCUIT DESCRIPTION
In the sensor check mode, a malfunction of the speed sensor that cannot be detected when the vehicle is stopped
is detected while driving.
Transition to the sensor check mode can be performed by connecting terminals TS and CG of the DLC3 and
turning the ignition switch from off to the ON position.
WIRING DIAGRAM
DTC is not outputA
DTC is outputB

Fig. 138: TS And CG Terminal Wiring Diagram
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
INSPECTION PROCEDURE
1.INSPECT DLC3 TERMINAL VOLTAGE (TS TERMINAL)
a. Turn the ignition switch to the ON position.
b. Measure the voltage according to the value (s) in the table below.
Standard:
TESTER CONNECTION SPECIFIED CONDITION
NG: Go to step 3
Tester ConnectionSpecified Condition
D1-12 (TS) - D1-4 (CG)10 to 14 V

Fig. 139: Identifying DLC3 Terminals
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
OK: Go to next step
2.CHECK HARNESS AND CONNECTOR (DLC3 - BODY GROUND)
a. Disconnect the skid control ECU connector.
b. Measure the resistance according to the value (s) in the table below.
Standard:
TESTER CONNECTION SPECIFIED CONDITION
c. Measure the resistance according to the value (s) in the table below.
Standard:
TESTER CONNECTION SPECIFIED CONDITION
Tester ConnectionSpecified Condition
S42-24 (TS) - D1-12 (TS)Below 1 ohms

3.CHECK HARNESS AND CONNECTOR (BODY GROUND - DLC3)
a. Measure the resistance according to the value (s) in the table below.
Standard:
TESTER CONNECTION SPECIFIED CONDITION
NG: REPAIR OR REPLACE HARNESS OR CONNECTOR
Fig. 141: Identifying DLC3 Terminals

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
OK: Go to next step
4.CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - DLC3)
Tester ConnectionSpecified Condition
D1-4 (CG) - Body groundBelow 1 ohms