LEXUS LS430 2003 Factory Repair Manual

Fig. 247: Disconnecting Television Camera ECU Sub Bus Line Connector (J50) From LUG-CAN
J/C A Side (W/Earth Terminal)
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
a. Disconnect the television camera ECU sub bus line connector (J50) from the LUG-CAN J/C A side
(w/earth terminal).

Fig. 248: Identifying DLC3 Connector terminals
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
b. Measure the resistance according to the value (s) in the table below.
Standard:
DLC3 CONNECTOR TERMINALS RESISTANCE
NG: REPLACE JUNCTION CONNECTOR (LUG-CAN J/C)
OK: GO TO NEXT STEP
40.CONNECT CONNECTOR
a. Reconnect the television camera ECU sub bus line connector (J50) to the LUG-CAN J/C A side
(w/earth terminal).
Tester connectionConditionSpecified value
D1-6 (CANH) - D1-4 (CG)Ignition Switch OFF1 kohms or more
D1-14 (CANL) - D1-4 (CG)Ignition Switch OFF1 kohms or more

41.CHECK CAN BUS LINE FOR SHORT TO GND (TELEVISION CAMERA ECU SUB BUS
LINE)
Fig. 249: Identifying DLC3 Connector terminals

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a. Disconnect the television camera ECU connector (T24).
b. Measure the resistance according to the value (s) in the table below.
Standard:
DLC3 CONNECTOR TERMINALS RESISTANCE
NG: REPAIR OR REPLACE TELEVISION CAMERA ECU SUB BUS LINE OR CONNECTOR
(w/o Pre-collision safety system)
Tester connectionConditionSpecified value
D1-6 (CANH) - D1-4 (CG)Ignition Switch OFF1 kohms or more
D1-14 (CANL) - D1-4 (CG)Ignition Switch OFF1 kohms or more

NG: Go to step 42 (w/ Pre-collision safety system)
OK: REPLACE TELEVISION CAMERA ECU
42.CONNECT CONNECTOR
a. Reconnect the television camera ECU connector (T24).
43.CHECK CAN BUS LINE FOR SHORT TO GND
Fig. 250: Disconnecting Television Camera ECU Sub Bus Line Connector (J52) From LUG
-CAN
J/C A Side (W/Earth Terminal)
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

a. Disconnect the television camera ECU sub bus line connector (J52) from the LUG-CAN J/C A side
(w/earth terminal).
Fig. 251: Identifying DLC3 Connector terminals

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
b. Measure the resistance according to the value (s) in the table below.
Standard:
DLC3 CONNECTOR TERMINALS RESISTANCE
OK: REPAIR OR REPLACE TELEVISION CAMERA ECU SUB BUS LINE OR CONNECTOR
NG: GO TO NEXT STEP
Tester connectionConditionSpecified value
D1-6 (CANH) - D1-4 (CG)Ignition Switch OFF1 kohms or more
D1-14 (CANL) - D1-4 (CG)Ignition Switch OFF1 kohms or more

44.CONNECT CONNECTOR
a. Reconnect the television camera ECU sub bus line connector (J52) to the LUG-CAN J/C A side
(w/earth terminal).
45.CHECK CAN BUS LINE FOR SHORT TO GND
Fig. 252: Identifying DLC3 Connector terminals

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
a. Disconnect the seat belt control ECU connector (S63).
b. Measure the resistance according to the value (s) in the table below.
Standard:
DLC3 CONNECTOR TERMINALS RESISTANCE
Tester connectionConditionSpecified value
D1-6 (CANH) - D1-4 (CG)Ignition Switch OFF1 kohms or more
D1-14 (CANL) - D1-4 (CG)Ignition Switch OFF1 kohms or more

NG: REPAIR OR REPLACE SEAT BELT CONTROL ECU SUB BUS LINE OR CONNECTOR
OK: REPLACE SEAT BELT CONTROL ECU
CIRCUIT DESCRIPTION
There may be a short circuit between the CAN bus line and GND when there is resistance between terminals 6
(CANH) and 4 (CG) or terminals 14 (CANL) and 4 (CG) of the DLC3.
Fig. 253: Problem Symptom Diagnostic Chart

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WIRING DIAGRAM

Fig. 254: Wiring Diagram - CAN Bus Line For Short To GND (W/O LEXUS Navigation System) (1 Of 2)
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

Fig. 255: Wiring Diagram - CAN Bus Line For Short To GND (W/O LEXUS Navigation System) (2 Of 2)
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
INSPECTION PROCEDURE
1.CHECK CAN BUS LINE FOR SHORT TO GND (DLC3 SUB BUS LINE)

Fig. 256: Identifying DLC3 Sub Bus Line Connector (J42)
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
a. Turn the ignition switch to the LOCK position.
b. Disconnect the DLC3 sub bus line connector (J42) from the D-CAN J/C B side (w/o earth
terminal).