2003 LEXUS LS430 Identifying ac

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

If the communication is normal when the tool is connected to another vehicle, inspect the DLC3 on
the original vehicle.
If the communication is still impossible when the tool is connected to another vehicle, the problem
is probably in the tool itself, so consult the Service Department listed in the tool's instruction
manual.
2.DIAGNOSIS CHECK (MULTI- INFORMATION DISPLAY)
a. Switch to diagnosis mode
1. Connect terminal 13 (TC) and 4 (CG) of the DLC3 using SST.
Fig. 32: Identifying Terminal 13 (TC) And 4 (CG) Of DLC3

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2. The display in the warning area shows "DIAG" when the ignition switch is turned to the ON
position.
3. Each system can be switched by pushing the "DISP1" switch on the steering pad switch.
HINT:
Dia
gnosis checks for the EFI, VSC and CRUISE systems can be done by using the displayed items

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