2003 LEXUS LS430 Identifying condition

Fig. 27: Identifying Waveform 1
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Waveform 1 (Reference):
WAVEFORM 1 (REFERENCE)
ItemContents
Tool setting5V/DIV, 10 ms/DIV
Vehicle conditionEngine idle speed

Fig. 28: Identifying Waveform 2
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Waveform 2 (Reference):
WAVEFORM 2 (REFERENCE)
HINT:
As vehicle speed increases, the cycle of the signal waveform narrows.
COMBINATION METER INNER CIRCUIT
ItemContents
Tool setting5V/DIV, 20 ms/DIV
Vehicle conditionDriving at approx. 20 Km/h (12 mph)

Fig. 31: Identifying DLC3 Connector Terminals
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DLC3 CONNECTOR TERMINALS REFERENCE
HINT:
If the display shows UNABLE TO CONNECT TO VEHICLE when you have connected the cable of the
hand-held tester to the DLC3, turned the ignition switch ON and operated the tester, there is a problem on
the vehicle side or tool side.
Symbols (Terminals No.)Terminals DescriptionConditionSpecified condition
CG(4) - Body groundChassis groundAlwaysBelow 1 ohms
BAT(16) - Body groundBattery positiveAlways11 to 14 V
CANH(6) - CANL(14)HIGH-level CAN bus lineIG switch OFF54 ohms to 67ohms
CANH(6) - Body groundHIGH-level CAN bus lineIG switch OFF1 Mohms or higher
CANH(6) - CG(4)HIGH-level CAN bus lineIG switch OFF3 Kohms or higher
CANL(14) - Body groundLOW-level CAN bus lineIG switch OFF1 Mohms or higher
CANL(14) - CG(4)LOW-level CAN bus lineIG switch OFF3 Kohms or higher

b. Measure the voltage according to the value (s) in the table below.
Standard
COMBINATION METER VOLTAGE SPECIFICATIONS
NG: REPAIR OR REPLACE HARNESS OR CONNECTOR
Fig. 44: Identifying Combination Meter Connector Terminals (Wire Harness View)

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OK: REPLACE COMBINATION METER ASSY (SEE OVERHAUL
)
C12-11 - Body groundAlwaysBelow 1 ohms
C12-22 - Body groundAlwaysBelow 1ohms
Terminal NoConditionSpecified condition
C12-12 - Body groundAlways10 to 14 V
C12-13 - Body groundAlways10 to 14 V
C12-1 - Body groundIgnition switch ACC or ON10 to 14 V

Fig. 46: Identifying Terminals C12-18
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e. Check the si
gnal waveform according to the condition (s) in the table below.

Fig. 47: Identifying Signal Waveform
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SIGNAL WAVEFORM CONDITIONS
OK:
As shown in the illustration
HINT:
As vehicle speed increases, the cycle of the signal waveform narrows.
NG: Go to step 5
OK: REPLACE COMBINATION METER ASSY (SEE OVERHAUL
)
ItemCondition
Tool setting5 V/DIV, 20 ms/DIV
Vehicle conditionDriving at approx. 20 Km/h (12 mph)

Fig. 48: Identifying C12 And S42 Connectors
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NG: REPAIR OR REPLACE HARNESS AND CONNECTOR
OK: GO TO NEXT STEP
6.INSPECT ABS & TRACTION ACTUATOR ASSY (VSC)
a. Disconnect the S42 connector.
b. Measure the voltage according to the value (s) in the table below.
Standard
S42 connector VOLTAGE SPECIFICATIONS
NG: REPLACE COMBINATION METER ASSY (SEE OVERHAUL
)
Fig. 49: Identifying S42 Connector Terminals

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OK: GO TO BRAKE CONTROL SYSTEM (SEE HOW TO PROCEED WITH
TROUBLESHOOTING )
Tester ConnectionConditionSpecified Condition
S42-12 - Body groundIgnition switch ON10 to 14 V

SIGNAL WAVEFORM CONDITION
OK:
As shown in the illustration
Fig. 51: Identifying Terminals C12
-4
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ItemCondition
Tool setting5 V/DIV, 10 ms/DIV
Vehicle conditionEngine idle speed