2003 LEXUS LS430 ignition

CAN MAIN BUS LINE CONNECTOR TERMINALS RESISTANCE
NG: REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (P-CAN J/C - D-CAN
J/C)
OK: GO TO NEXT STEP
5.CONNECT CONNECTOR
a. Reconnect the CAN main bus line connector (J45) to the P-CAN J/C A side (w/earth terminal).
6.CHECK CAN MAIN BUS LINE FOR DISCONNECTION (P-CAN J/C)
Tester connectionConditionSpecified value
J45-1 (CANH) - J45-2 (CANL)Ignition Switch OFF108 to 132 ohms

Fig. 77: Identifying CAN Main Bus Line Connector (J47)
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
a. Disconnect the CAN main bus line connector (J47) from the P-CAN J/C B side (w/o earth
terminal).
b. Measure the resistance according to the value (s) in the table below.
Standard:
CAN MAIN BUS LINE CONNECTOR TERMINALS RESISTANCE
OK: REPLACE JUNCTION CONNECTOR (P-CAN J/C)
NG: GO TO NEXT STEP
7.CONNECT CONNECTOR
a. Reconnect the CAN main bus line (J47) to the P-CAN J/C B side (w/o earth terminal).
8.CHECK CAN MAIN BUS LINE FOR DISCONNECTION (LUG-CAN J/C)
Tester connectionConditionSpecified value
J47-1 (CANH) - J47-2 (CANL)Ignition Switch OFF108 to 132 ohms

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. 81: Identifying DLC3 Connector terminals
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
a. Turn the ignition switch to the LOCK position.
b. Measure the resistance according to the value (s) in the table below.
Result:
DLC3 CONNECTOR TERMINALS RESISTANCE
Tester connectionConditionSpecified valueResult
D1-6 (CANH) - D1-14 (CANL)Ignition Switch OFF108 to 132 ohmsA
D1-6 (CANH) - D1-14 (CANL)Ignition Switch OFF132ohmsor moreB

b. Measure the resistance according to the value (s) in the table below.
Standard:
CAN MAIN BUS LINE CONNECTOR (J37) TERMINALS RESISTANCE
OK: REPLACE JUNCTION CONNECTOR (D-CAN J/C)
NG: GO TO NEXT STEP
3.CONNECT CONNECTOR
a. Reconnect the CAN main bus line connector (J37) to the D-CAN J/C.
4.CHECK CAN MAIN BUS LINE FOR DISCONNECTION (D-CAN J/C - P-CAN J/C)
Tester connectionConditionSpecified value
J37-1 (CANH) - J37-2 (CANL)Ignition Switch OFF108 to 132 ohms

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. 86: Disconnecting DLC3 Sub Bus Line Connector (J42) From D-CAN J/C B Side (W/O Earth
Terminal)
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. 87: 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, CANL)
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).
3.CHECK CAN BUS LINES FOR SHORT CIRCUIT (CAN BUSES TO D-CAN J/C)
Tester connectionConditionSpecified value
D1-6 (CANH) - D1-14 (CANL)Ignition Switch OFF1 Mohms or more