LEXUS LS430 2003 Factory Repair Manual

a. Disconnect the B5 and A25 connectors.
b. Measure the resistance according to the value (s) in the table below.
Standard
RESISTANCE SPECIFICATIONS
Tester ConnectionConditionSpecified Condition
B5-2 - A25-15AlwaysBelow 1 ohms
B5-2 - Body groundAlways10 kohms or higher

Fig. 73: Identifying B5 And A25 Connector Terminals
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
NG: REPAIR OR REPLACE HARNESS OR CONNECTOR
OK: REPLACE AIRBAG SENSOR ASSY CENTER (SEE HOW TO PROCEED WITH
TROUBLESHOOTING )
6.INSPECT COMBINATION METER ASSY
a. Disconnect the clock assy connector.
b. Measure the voltage according to the value (s) in the table below.
Standard
VOLTAGE SPECIFICATIONS
NG: Go to step 8
Fig. 74: Identifying C12 Connector Terminals
Terminal NoConditionSpecified condition
C12-9 - Body groundIgnition switch ON, Passenger seat belt is unfastened10 to 14 V

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
OK: GO TO NEXT STEP
7.INSPECT CLOCK ASSY
a. Disconnect the clock assy connector.
b. Measure the voltage according to the value (s) in the table below.
Standard
CLOCK ASSY CONNECTOR TERMINALS VOLTAGE SPECIFICATIONS
NG: REPAIR OR REPLACE HARNESS OR CONNECTOR
Fig. 75: Identifying Clock Assy Connector Terminals Front View
Terminal NoConditionSpecified condition
C10-7 - C10-5Ignition switch ON, Passenger seat belt is unfastened10 to 14 V

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
OK: REPLACE CLOCK ASSY
8.CHECK HARNESS AND CONNECTOR (CLOCK ASSY - COMBINATION METER ASSY)
(SEE HOW TO PROCEED WITH TROUBLESHOOTING
)
a. Disconnect the C10 and C12 connectors.
b. Measure the resistance according to the value (s) in the table below.
Standard
C10 AND C12 CONNECTORS RESISTANCE SPECIFICATIONS
Tester ConnectionConditionSpecified Condition
C12-9 - C10-7AlwaysBelow 1 ohms
C12-9 - Body groundAlways10 kohms or higher

Fig. 76: Identifying C10 And C12 Connector Terminals
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
NG: REPAIR OR REPLACE HARNESS OR CONNECTOR
OK: REPLACE COMBINATION METER ASSY (SEE OVERHAUL
)
9.INSPECT COMBINATION METER ASSY
a. Disconnect the combination meter connectors.
b. Measure the voltage according to the value (s) in the table below.
Standard
COMBINATION METER CONNECTOR TERMINALS VOLTAGE SPECIFICATIONS
NG: Go to step 11
Fig. 77: Identifying Combination Meter Connector Terminals

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
Terminal NoConditionSpecified condition
C12-9 - Body groundIgnition switch ON, Passenger seat belt is unfastened10 to 14 V

OK: GO TO NEXT STEP
10.INSPECT MULTI-DISPLAY
a. Disconnect the multi-display connector.
b. Measure the voltage according to the value (s) in the table below.
Standard
MULTI-DISPLAY CONNECTOR TERMINALS VOLTAGE SPECIFICATIONS
NG: REPAIR OR REPLACE HARNESS OR CONNECTOR
Fig. 78: Identifying Multi
-Display Connector Terminals
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
Terminal NoConditionSpecified condition
M4-21 - M4-3Ignition switch ON, Passenger seat belt is unfastened10 to 14 V

OK: REPLACE MULTI-DISPLAY
11.CHECK HARNESS AND CONNECTOR (MULTI-DISPLAY - COMBINATION METER ASSY)
(SEE HOW TO PROCEED WITH TROUBLESHOOTING
)
a. Disconnect the M4 and C12 connectors.
b. Measure the resistance according to the value (s) in the table below.
Standard
M4 AND C12 CONNECTORS RESISTANCE SPECIFICATIONS
Tester ConnectionConditionSpecified Condition
C12-9 - M4-21AlwaysBelow 1 ohms
C12-9 - Body groundAlways10 kohms or higher