2003 LEXUS LS430 Identifying ac

Fig. 35: Identifying DLC3 Connector terminals
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
a. Measure the resistance according to the value (s) in the table below.
Standard:
ECM CONNECTOR TERMINALS RESISTANCE
HINT:
NG-A: w/o LEXUS Navigation System.
NG-B: w/ LEXUS Navigation System.
NG-A: CHECK CAN BUS LINE FOR SHORT TO GND (W/O LEXUS NAVIGATION SYSTEM)
Tester ConnectionConditionSpecified value
D1-4 (CG) - D1-6 (CANH)Ignition Switch OFF1 kohms or more
D1-4 (CG) - D1-14 (CANL)Ignition Switch OFF1 kohms or more

Fig. 39: Identifying Skid Control ECU Connectors
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
a. Measure the resistance according to the value (s) in the table below.
b. Measure the voltage according to the value (s) in the table below.
Standard:
SKID CONTROL ECU CONNECTOR TERMINALS VOLTAGE
NG: REPAIR OR REPLACE WIRE HARNESS OR CONNECTOR
OK: REPLACE SKID CONTROL ECU WITH ACTUATOR (SEE REPLACEMENT
)
Tester ConnectionConditionSpecified value
S42-1 (GND2) - Body groundAlwaysBelow 1
S42-32 (GND1) - Body groundAlwaysBelow 1
S42-46 (IG1) - Body groundIgnition Switch ON10 to 14 V

Fig. 46: Identifying Yaw Rate Sensor Connector
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
a. Turn the ignition switch to the LOCK position.
b. Disconnect the yaw rate sensor connector (Y1).
c. Measure the resistance according to the value (s) in the table below.
Standard:
YAW RATE SENSOR CONNECTOR TERMINALS RESISTANCE
NG: REPAIR OR REPLACE YAW RATE SENSOR SUB BUS LINE OR CONNECTOR (CAN-H,
CAN-L)
OK: GO TO NEXT STEP
2.CHECK WIRE HARNESS (IG, GND)
Tester connectionConditionSpecified value
Y1-2 (CANL) - Y1-3 (CANH)Ignition Switch OFF54 to 69 ohms

Fig. 47: Identifying Yaw Rate Sensor Connector
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
a. Measure the resistance according to the value (s) in the table below.
b. Measure the voltage according to the value (s) in the table below.
Standard:
YAW RATE SENSOR CONNECTOR TERMINALS RESISTANCE AND VOLTAGE
NG: REPAIR OR REPLACE HARNESS OR CONNECTOR
OK: REPLACE YAW RATE SENSOR (SEE REPLACEMENT
)
Tester ConnectionConditionSpecified Condition
Y1-1 (GND) - Body groundAlwaysBelow 1 ohms
Y1-5 (IG) - Body groundIgnition Switch ON10 to 14 V

Fig. 74: 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 OFF132ohms or moreB

B: REPAIR OR REPLACE DLC3 SUB BUS LINE OR CONNECTOR (CAN-H, CAN-L)
A: GO TO NEXT STEP
2.CHECK CAN MAIN BUS LINE FOR DISCONNECTION (D-CAN J/C)
Fig. 75: Identifying CAN Main Bus Line Connector (J37)

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
a. Disconnect the CAN main bus line connector (J37) from the D-CAN J/C A side (w/earth terminal).

Fig. 76: 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).
b. Measure the resistance according to the value (s) in the table below.
Standard:

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