2003 LEXUS LS430 Combination

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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
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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: 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

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-

OK:
Switch condition (ON/OFF) can be switched by actual operation.
NG: Go to step 2
OK: REPLACE COMBINATION METER ASSY (SEE OVERHAUL
)
2.INSPECT TRIP SWITCH
a. Disconnect the trip switch connector.
b. Measure the resistance according to the value (s) in the table below.
Standard
TRIP SWITCH CONNECTOR RESISTANCE SPECIFICATIONS
NG: REPLACE TRIP SWITCH
Terminal NoConditionSpecified condition
T10-1 - T10-2ODO/TRIP switch OFF --> ON10 kohms or higher --> Below 1 ohms
T10-3 - T10-2RESET switch OFF --> ON10 kohms or higher --> Below 1 ohms

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)-

OK:
Light control can be changed within the specified range by actual operation.
NG: Go to step 2
OK: REPLACE COMBINATION METER ASSY (SEE OVERHAUL
)
2.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".
BODY No.2:
DATA LIST REFERENCE
OK:
Light control can be changed within the specified range by actual operation
NG: Go to step 5
OK: GO TO NEXT STEP
3.CHECK HARNESS AND CONNECTOR (DRIVER SIDE JUNCTION BLOCK -COMBINATION
METER ASSY) (SEE HOW TO PROCEED WITH TROUBLESHOOTING
)
a. Disconnect the C12 and D6 connectors.
b. Measure the resistance according to the value (s) in the table below.
Standard
C12 AND D6 CONNECTORS RESISTANCE SPECIFICATIONS
ItemMeasurement Item/ Range
(Display)Normal ConditionDiagnostic
Note
LIGHT
RHEOSTATLight control rheostat / Min.: 0,
Max.: 255Light control rheostat switch is Dark
(0) --> Bright (255)-
Tester ConnectionConditionSpecified Condition
C12-16 - D6-15AlwaysBelow 1 ohms
C12-16 - Body groundAlways10 kohms or higher