2003 LEXUS LS430 Identifying ac

17.CHECK CAN BUS LINES FOR SHORT CIRCUIT (SUSPENSION CONTROL ECU SUB BUS
LINE)
Fig. 141: Identifying DLC3 Connector terminals

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
a. Disconnect the suspension control ECU connector (A20).
b. Measure the resistance according to the value (s) in the table below.
Standard:
DLC3 CONNECTOR TERMINALS RESISTANCE
OK: REPLACE SUSPENSION CONTROL ECU (SEE REPLACEMENT
)
NG: REPAIR OR REPLACE SUSPENSION CONTROL ECU SUB BUS LINE OR CONNECTOR
(CAN-H, CAN-L)
Tester connectionConditionSpecified value
D1-6 (CANH) - D1-14 (CANL)Ignition Switch OFF54 to 69 ohms

18.CONNECT CONNECTOR
a. Reconnect the gateway ECU sub bus line connector (J36) to the D-CAN J/C A side (w/earth
terminal).
19.CHECK CAN BUS LINES FOR SHORT CIRCUIT (GATEWAY ECU SUB BUS LINE)
Fig. 142: Identifying DLC3 Connector terminals

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
a. Disconnect the gateway ECU sub bus line connector (G3).
b. Measure the resistance according to the value (s) in the table below.
Standard:
GATEWAY ECU SUB BUS LINE CONNECTOR TERMINALS RESISTANCE
OK: REPLACE GATEWAY ECU
Tester connectionConditionSpecified value
D1-6 (CANH) - D1-14 (CANL)Ignition Switch OFF54 to 69 ohms

NG: REPAIR OR REPLACE GATEWAY ECU SUB BUS LINE OR CONNECTOR (CAN-H,
CAN-L)
20.CONNECT CONNECTOR
a. Reconnect the ECM sub bus line connector (J40) to the D-CAN J/C B side (w/o earth terminal).
21.CHECK CAN BUS LINES FOR SHORT CIRCUIT (ECM SUB BUS LINE)
Fig. 143: Identifying DLC3 Connector terminals

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
a. Disconnect the ECM connector (E3).
b. Measure the resistance according to the value (s) in the table below.
Standard:
ECM CONNECTOR TERMINALS RESISTANCE
Tester connectionConditionSpecified value
D1-6 (CANH) - D1-14 (CANL)Ignition Switch OFF54 to 69 ohms

OK: REPLACE ECM (SEE REPLACEMENT)
NG: REPAIR OR REPLACE ECM SUB BUS LINE OR CONNECTOR (CAN-H, CAN-L)
22.CONNECT CONNECTOR
a. Reconnect the skid control ECU sub bus line connector (J41) to the D-CAN J/C B side (w/earth
terminal).
23.CHECK CAN BUS LINES FOR SHORT CIRCUIT (SKID CONTROL ECU SUB BUS LINE)
Fig. 144: Identifying DLC3 Connector terminals

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
a. Disconnect the skid control ECU connector (S42).
b. Measure the resistance according to the value (s) in the table below.
Standard:
SKID CONTROL ECU SUB BUS LINE CONNECTOR TERMINALS RESISTANCE
Tester connectionConditionSpecified value

OK: REPLACE SKID CONTROL ECU WITH ACTUATOR (SEE REPLACEMENT )
NG: REPAIR OR REPLACE SKID CONTROL ECU SUB BUS LINE OR CONNECTOR (CAN-
H, CAN-L)
24.CONNECT CONNECTOR
a. Reconnect the steering sensor sub bus line connector (J43) to the D-CAN J/C B side (w/o earth
terminal).
25.CHECK CAN BUS LINES FOR SHORT CIRCUIT (STEERING SENSOR SUB BUS LINE)
Fig. 145: Identifying DLC3 Connector terminals

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
a. Disconnect the steering sensor connector (S16).
b. Measure the resistance according to the value (s) in the table below.
Standard:
D1-6 (CANH) - D1-14 (CANL)Ignition Switch OFF54 to 69 ohms

Fig. 147: 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: Go to step 30
NG: GO TO NEXT STEP
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).
29.CHECK CAN BUS LINES FOR SHORT CIRCUIT (YAW RATE SENSOR SUB BUS LINE)
Tester connectionConditionSpecified value
D1-6 (CANH) - D1-14 (CANL)Ignition Switch OFF54 to 69 ohms

Fig. 149: 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:
YAW RATE SENSOR SUB BUS LINE CONNECTOR TERMINALS RESISTANCE
OK: Go to step 32
NG: REPLACE JUNCTION CONNECTOR (P-CAN J/C)
30.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).
31.CHECK CAN BUS LINES FOR SHORT CIRCUIT (DISTANCE CONTROL ECU SUB BUS
Tester connectionConditionSpecified value
D1-6 (CANH) - D1-14 (CANL)Ignition Switch OFF54 to 69 ohms

LINE)
Fig. 150: 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:
DISTANCE CONTROL ECU CONNECTOR TERMINALS RESISTANCE
OK: REPLACE DISTANCE CONTROL ECU ASSY (SEE REPLACEMENT
)
NG: REPAIR OR REPLACE DISTANCE CONTROL ECU SUB BUS LINE OR CONNECTOR
(CAN-H, CAN-L)
Tester connectionConditionSpecified value
D1-6 (CANH) - D1-14 (CANL)Ignition Switch OFF54 to 69 ohms