2003 LEXUS LS430 air condition

OK: GO TO NEXT STEP
2.CHECK WIRE HARNESS (IG, GND)
Fig. 71: Disconnecting Seat Belt Control ECU Connector (S63)

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
a. Disconnect the seat belt control ECU connector (S63).
b. Measure the resistance according to the value (s) in the table below.
c. Measure the voltage according to the value (s) in the table below.
Standard:
SEAT BELT CONTROL ECU CONNECTOR TERMINALS RESISTANCE AND VOLTAGE
NG: REPAIR OR REPLACE WIRE HARNESS OR CONNECTOR
Tester ConnectionConditionSpecified Condition
S63-18 (GND) - Body groundAlwaysBelow 1 ohms
S63-9 (+B) - Body groundAlways10 to 14 V
S63-3 (IG) - Body groundIgnition Switch ON10 to 14 V

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

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

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. 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

Fig. 101: 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
NG: REPLACE JUNCTION CONNECTOR (D-CAN J/C)
OK: REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (D-CAN J/C - P-CAN
Tester connectionConditionSpecified value
D1-6 (CANH) - D1-14 (CANL)Ignition Switch OFF108 to 132 ohms

DLC3 CONNECTOR TERMINALS RESISTANCE
OK: REPLACE GATEWAY ECU
NG: GO TO NEXT STEP
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. 104: Identifying DLC3 Connector terminals

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
a. Disconnect the ECU connector (E3).
Tester connectionConditionSpecified value
D1-6 (CANH) - D1-14 (CANL)Ignition Switch OFF54 to 69 ohms

b. Measure the resistance according to the value (s) in the table below.
Standard:
DLC3 CONNECTOR TERMINALS RESISTANCE
OK: REPLACE ECM (SEE REPLACEMENT
)
NG: GO TO NEXT STEP
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/o earth
terminal).
23.CHECK CAN BUS LINES FOR SHORT CIRCUIT (SKID CONTROL ECU SUB BUS LINE)
Tester connectionConditionSpecified value
D1-6 (CANH) - D1-14 (CANL)Ignition Switch OFF54 to 69 ohms