2003 LEXUS LS430 Diagram AC

Fig. 73: Wiring Diagram - Can Main Bus Line For Disconnection (W/ LEXUS Navigation System)
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
INSPECTION PROCEDURE
1.CHECK DLC3

b. Measure the resistance according to the value (s) in the table below.
Standard:
CAN MAIN BUS LINE CONNECTOR (J49) TERMINALS RESISTANCE
OK: REPLACE JUNCTION CONNECTOR (LUG-CAN J/C)
NG: GO TO NEXT STEP
REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (P-CAN J/C - LUG-CAN J/C)
CIRCUIT DESCRIPTION
There may be an open circuit in the CAN main bus line and/or the DLC3 sub bus line when the resistance
between terminals 6 (CANH) and 14 (CANL) of the DLC3 is 69 ohms or more.
Fig. 79: Problem Symptom Diagnostic Chart

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
WIRING DIAGRAM
Tester connectionConditionSpecified value
J49-1 (CANH) - J49-2 (CANL)Ignition Switch OFF108 to 132 ohms

Fig. 80: Wiring Diagram - CAN Main Bus Line For Disconnection (W/O Lexus Navigation System)
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
INSPECTION PROCEDURE
1.CHECK DLC3

Standard:
CAN MAIN BUS LINE CONNECTOR (J45) TERMINALS RESISTANCE
NG: REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (CAN-H, CAN-L)
OK: REPLACE JUNCTION CONNECTOR (P-CAN J/C)
CIRCUIT DESCRIPTION
There may be a short circuit between the CAN bus lines when the resistance between terminals 6 (CANH) and
14 (CANL) of the DLC3 is below 54 ohms.
Fig. 84: Problem Symptom Diagnostic Chart

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
WIRING DIAGRAM
Tester connectionConditionSpecified value
J45-1 (CANH) - J45-2 (CANL)Ignition Switch OFF108 to 132 ohms

Fig. 85: Wiring Diagram - CAN Bus Lines For Short Circuit (W/ Lexus Navigation System)
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
INSPECTION PROCEDURE
1.CHECK CAN BUS LINES FOR SHORT CIRCUIT (DLC3 SUB BUS LINE)

OK: REPAIR OR REPLACE SEAT BELT CONTROL ECU SUB BUS LINE OR CONNECTOR
CIRCUIT DESCRIPTION
There may be a short circuit between the CAN bus lines when the resistance between terminals 6 (CANH) and
14 (CANL) of the DLC3 is below 54 ohms.
Fig. 123: Problem Symptom Diagnostic Chart

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
WIRING DIAGRAM

Fig. 124: Wiring Diagram - CAN Bus Lines For Short Circuit (W/O LEXUS Navigation System)
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
INSPECTION PROCEDURE
1.CHECK CAN BUS LINES FOR SHORT CIRCUIT (DLC3 SUB BUS LINE)

NG: REPAIR OR REPLACE YAW RATE SENSOR SUB BUS LINE OR CONNECTOR (CAN-H,
CAN-L)
CIRCUIT DESCRIPTION
There may be a short circuit between the CAN bus line and +B when there is resistance between terminals 6
(CANH) and 16 (BAT) or terminals 14 (CANL) and 16 (BAT) of the DLC3.
Fig. 152: Problem Symptom Diagnostic Chart

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
WIRING DIAGRAM