Identifying condition LEXUS LS430 2003 Factory Repair Manual

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

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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

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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

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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
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Terminal NoConditionSpecified condition
M4-21 - M4-3Ignition switch ON, Passenger seat belt is unfastened10 to 14 V

Fig. 79: Identifying M4 And C12 Connector Terminals
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NG: REPAIR OR REPLACE HARNESS OR CONNECTOR
OK: REPLACE COMBINATION METER ASSY (SEE OVERHAUL
)
WIRING DIAGRAM
Fig. 80: ODO/TRIP Switch Wiring Diagram

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INSPECTION PROCEDURE
1.READ VALUE OF HAND-HELD TESTER
a. Operate the hand-held tester according to the steps on the display and select the "DATA LIST".
METER:
DATA LIST REFERENCE
ItemMeasurement Item/ Range (Display)Normal ConditionDiagnostic Note
ODO/TRIP SWODO/TRIP switch is ON / OFFON: Switch is pushed
OFF: Switch is released-
TRIP RESET SWTRIP RESET switch is ON / OFFON: Switch is pushed
OFF: Switch is released-

Fig. 81: Identifying Trip Switch Connector Terminals
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OK: GO TO NEXT STEP
3.CHECK HARNESS AND CONNECTOR (TRIP SWITCH - COMBINATION METER ASSY)
(SEE HOW TO PROCEED WITH TROUBLESHOOTING
)
a. Disconnect the C12 and T10 connectors.
b. Measure the resistance according to the value (s) in the table below.
Standard
C12 AND T10 CONNECTORS RESISTANCE SPECIFICATIONS
Tester ConnectionConditionSpecified Condition
C12-7 - T10-1AlwaysBelow 1 ohms
C12-8 - T10-3AlwaysBelow 1 ohms
C12-10 - T10-2AlwaysBelow 1 ohms
C12-7 - Body groundAlways10 kohms or higher
C12-8 - Body groundAlways10 kohms or higher
C12-10 - Body groundAlways10 kohms or higher

Fig. 82: Identifying C12 And T10 Connector Terminals
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NG: REPAIR OR REPLACE HARNESS OR CONNECTOR
OK: REPLACE COMBINATION METER ASSY (SEE OVERHAUL
)
WIRING DIAGRAM
Fig. 83: Light Control Rheostat Wiring Diagram

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INSPECTION PROCEDURE
1.READ VALUE OF HAND-HELD TESTER (LIGHT RHEOSTAT SIGNAL)
a. Operate the hand-held tester according to the steps on the display and select the "DATA LIST".
METER:
DATA LIST REFERENCE
ItemMeasurement Item/ Range
(Display)Normal ConditionDiagnostic
Note
LIGHT
RHEOSTATLight control rheostat / Min.: 0,
Max.: 255Light control rheostat switch is Dark
(0) --> Bright (255)-

Fig. 84: Identifying Light Control Rheostat Connector Terminals
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NG: REPAIR OR REPLACE HARNESS OR CONNECTOR
OK: GO TO NEXT STEP
4.REPLACE DRIVER SIDE JUNCTION BLOCK
OK:
Normal operation
NG: REPLACE COMBINATION METER ASSY (SEE OVERHAUL
)
OK: END
5.INSPECT LIGHT CONTROL RHEOSTAT
a. Disconnect the light control rheostat connector.
b. Measure the voltage according to the value (s) in the table below.
Standard
LIGHT CONTROL RHEOSTAT VOLTAGE SPECIFICATIONS
NG: REPLACE LIGHT CONTROL RHEOSTAT
Terminal NoConditionSpecified condition
1 - 2Rheostat knob turned fully clockwiseApprox. 0 kohms
1 - 2Rheostat knob turned fully counterclockwiseApprox. 10 +/- 2 kohms
1 - 3AlwaysApprox. 10 +/- 2 kohms
4 - 1,3Rheostat knob turned fully counterclockwise10 kohms or higher
4 - 1,3Rheostat knob turned to fully clockwiseBelow 1 ohms

Fig. 85: Identifying D6 And R4 Connector Terminals
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6.CHECK HARNESS AND CONNECTOR (LIGHT CONTROL RHEOSTAT - DRIVER SIDE
JUNCTION BLOCK) (SEE HOW TO PROCEED WITH TROUBLESHOOTING
)
a. Disconnect the D6 and R4 connectors.
b. Measure the resistance according to the value (s) in the table below.
Standard
D6 AND R4 CONNECTORS RESISTANCE SPECIFICATIONS
Tester ConnectionConditionSpecified Condition
D6-20 - R4-3AlwaysBelow 1 ohms
D6-22 - R4-2AlwaysBelow 1 ohms
D6-21 - R4-1AlwaysBelow 1 ohms
D6-1 - R4-4AlwaysBelow 1 ohms