LEXUS LS430 2003 Factory Repair Manual

Fig. 209: Identifying DLC3 Connector terminals
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b. Measure the resistance according to the value (s) in the table below.
Standard:
DLC3 CONNECTOR TERMINALS RESISTANCE
OK: Go to step 28
NG: GO TO NEXT STEP
26.CONNECT CONNECTOR
a. Reconnect the distance control ECU sub bus line connector (J48) to the P-CAN J/C B side (w/o
earth terminal).
27.CHECK CAN BUS LINE FOR SHORT TO +B (YAW RATE SENSOR SUB BUS LINE)
Tester connectionConditionSpecified value
D1-6 (CANH) - D1-16 (BAT)Ignition Switch OFF1 Mohms or more
D1-14 (CANL) - D1-16 (BAT)Ignition Switch OFF1 Mohms or more

Fig. 210: Identifying Yaw Rate Sensor Connector (J44)
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
a. Disconnect the yaw rate sensor sub bus line from the P-CAN J/C A side (w/earth terminal).

Fig. 211: 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: REPLACE YAW RATE SENSOR (SEE REPLACEMENT
)
NG: REPAIR OR REPLACE YAW RATE SENSOR SUB BUS LINE OR CONNECTOR (CAN-H,
CAN-L)
28.CONNECT CONNECTOR
a. Reconnect the distance control ECU sub bus line connector (J48) to the P-CAN J/C B side (w/o
earth terminal).
Tester connectionConditionSpecified value
D1-6 (CANH) - D1-16 (BAT)Ignition Switch OFF1 Mohms or more
D1-14 (CANL) - D1-16 (BAT)Ignition Switch OFF1 Mohms or more

29.CHECK CAN BUS LINE FOR SHORT TO +B (DISTANCE CONTROL ECU SUB BUS LINE)
Fig. 212: Identifying DLC3 Connector terminals

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
a. Disconnect the distance control ECU connector (D2).
b. Measure the resistance according to the value (s) in the table below.
Standard:
DLC3 CONNECTOR TERMINALS RESISTANCE
NG: REPAIR OR REPLACE DISTANCE CONTROL ECU SUB BUS LINE OR CONNECTOR
(CAN-H, CAN-L)
OK: REPLACE DISTANCE CONTROL ECU ASSY (SEE REPLACEMENT
)
Tester connectionConditionSpecified value
D1-6 (CANH) - D1-16 (BAT)Ignition Switch OFF1 Mohms or more
D1-14 (CANL) - D1-16 (BAT)Ignition Switch OFF1 Mohms or more

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. 213: Problem Symptom Diagnostic Chart

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WIRING DIAGRAM

Fig. 214: Wiring Diagram - CAN Bus Line For Short To GND (W/ LEXUS Navigation System) (1 Of 2)
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

Fig. 215: Wiring Diagram - CAN Bus Line For Short To GND (W/ 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. 216: 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).

Fig. 217: Identifying DLC3 Connector terminals
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
c. Measure the resistance according to the value (s) in the table below.
Standard:
DLC3 CONNECTOR TERMINALS RESISTANCE
NG: REPAIR OR REPLACE DLC3 SUB BUS LINE OR CONNECTOR (CAN-H, CAN-L)
OK: GO TO NEXT STEP
2.CONNECT CONNECTOR
a. Reconnect the DLC3 sub bus line connector (J42) to the D-CAN J/C B side (w/o earth terminal).
Tester connectionConditionSpecified value
D1-6 (CANH) D1-4 (CG)Ignition Switch OFF1 Mohms or more
D1-14 (CANL) D1-4 (CG)Ignition Switch OFF1 Mohms or more

3.CHECK CAN BUS LINE FOR SHORT TO GND (CAN BUSES TO D-CAN J/C)
Fig. 218: Identifying CAN Main Bus Line Connector (J45)

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
a. Disconnect the CAN main bus line connector (J45) from the P-CAN J/C A side (w/earth terminal).