2003 LEXUS LS430 Identifying ac

Fig. 68: Identifying Front Seat Inner Belt Assy (Driver Side) Connector Wire Harness View
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
OK: GO TO NEXT STEP
5.CHECK HARNESS AND CONNECTOR (FRONT SEAT INNER BELT ASSY - DRIVER SIDE
JUNCTION BLOCK) (SEE HOW TO PROCEED WITH TROUBLESHOOTING
)
a. Disconnect the B4, A23 connectors.
b. Measure the resistance according to the value (s) in the table below.
Standard
B4 AND A23 CONNECTORS RESISTANCE SPECIFICATIONS
Tester ConnectionConditionSpecified Condition
B4-2 - A23-10AlwaysBelow 1 ohms
A23-10 - Body groundAlways10 kohms or higher

Fig. 69: Identifying B4 And A23 Connector Terminals

C: Go to step 9
A: GO TO NEXT STEP
3.INSPECT FRONT SEAT INNER BELT ASSY (PASSENGER SIDE)
a. Disconnect the connector from the front seat inner belt assy (FR Passenger Side).
b. Measure the resistance according to the value (s) in the table below.
Standard
RESISTANCE SPECIFICATIONS
NG: REPLACE FRONT SEAT INNER BELT ASSY (PASSENGER SIDE)
Fig. 71: Identifying Front Seat Inner Belt Assy (Passenger Side) Connector Terminals

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OK: GO TO NEXT STEP
Terminal NoConditionSpecified condition
B5-2 - B5-5Seat belt is fastenedApprox. 330 ohms
B5-2 - B5-5Seat belt is unfastenedApprox. 1,330 ohms

4.CHECK HARNESS AND CONNECTOR (FRONT SEAT INNER BELT ASSY - BODY
GROUND) (SEE HOW TO PROCEED WITH TROUBLESHOOTING
)
a. Disconnect the connector from the front seat inner belt assy (FR Passenger Side).
b. Measure the resistance according to the value (s) in the table below.
Standard
RESISTANCE SPECIFICATIONS
NG: REPAIR OR REPLACE HARNESS OR CONNECTOR
Fig. 72: Identifying Front Seat Inner Belt Assy (Passenger Side) Connector Terminals

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
OK: GO TO NEXT STEP
5.CHECK HARNESS AND CONNECTOR (FRONT SEAT INNER BELT ASSY - AIRBAG
SENSOR ASSY CENTER) (SEE HOW TO PROCEED WITH TROUBLESHOOTING
)
Tester ConnectionConditionSpecified Condition
B5-5 - Body groundAlwaysBelow 1 ohms

Fig. 73: Identifying B5 And A25 Connector Terminals
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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

Fig. 76: Identifying C10 And C12 Connector Terminals
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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