Identifying condition LEXUS LS430 2003 Factory Repair Manual

Standard:
TESTER CONNECTION AND SPECIFIED CONDITION
If the result is not as specified, replace the rear seat cushion heater assy RH.
Fig. 97: Identifying Rear Wing Outer Heater RH Connector Terminals

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b. Measure the resistance between the terminals of the rear wing inner heater RH.
Standard:
Tester ConnectionConditionSpecified Condition
1 - 220°C (68°F)2.8 to 3.4 ohms

TESTER CONNECTION AND SPECIFIED CONDITION
If the result is not as specified, replace the rear seat cushion heater assy RH.
Fig. 98: Identifying Rear Wing Outer Heater RH Connector Terminals

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c. Check the resistance between the terminals of the rear cushion heater RH.
Standard:
TESTER CONNECTION AND SPECIFIED CONDITION
Tester ConnectionConditionSpecified Condition
1 - 220°C (68°F)7.2 to 8.8 ohms

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p.INSPECT REAR SEATBACK HEATER ASSY RH
a. Measure the resistance between the terminals of the rear seatback heater RH.
Standard:
TESTER CONNECTION AND SPECIFIED CONDITION
If the result is not as specified, replace the rear seatback heater assy RH.
Fig. 100: Identifying Rear Seatback Heater RH Connector Terminals

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Tester ConnectionConditionSpecified Condition
A2 - A420°C (68°F)5.4 to 6.6 ohms
S61-4 - A220°C (68°F)5.4 to 6.6 ohms
S61-2 - A420°C (68°F)5.4 to 6.6 ohms
S61-1 - A1AlwaysBelow 1 ohms
S61-3 - A3AlwaysBelow 1 ohms

Fig. 26: Identifying Terminals Of ECU (Combination Meter Assy)
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COMBINATION METER ASSY CONNECTOR TERMINALS REFERENCE
Symbols
(Terminals No.)Wiring
ColorTerminal DescriptionConditionSpecified
Condition
IG + (C12-1) -
Body groundY - Body
groundIgnition switch signal
(ON)Ignition switch OFF -->
ONBelow 1 V --> 10
to 14 V
MPX + (C12-2) -
Body groundGR-B -
Body groundMultiplex
communication signal--
MPX- (C12-3) -
Body groundGR-B -
Body groundMultiplex
communication signal--
S (C12-4) - Body
groundB-Y - Body
groundTachometer signalEngine runningPulse generation
(See waveform 1)
CHECK (C12-5) -
Body groundY-R - Body
groundCHECK ENGINE
signalCHECK ENGINE warning
light ON --> OFFBelow 1 V --> 10
to 14 V
TEMS (C12-6) -
Body groundY - Body
groundTEMS SPORT signalTEMS SPORT indicator
light ON --> OFFBelow 1 V --> 10
to 14 V
A/B (C12-7) - V-R (W) - ODO/TRIP signalIgnition switch ON,
ODO/TRIP switch ON -->
Below 1 V --> 4.5

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)