2003 LEXUS LS430 Identifying condition

Fig. 82: Identifying Seat Climate Controller RH Connector Terminals (Front Seatback)
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
b. Measure the thermistor resistance between the terminals.
Standard:
TESTER CONNECTION AND SPECIFIED CONDITION
HINT:
As the temperature increases, the resistance decreases.
Tester ConnectionConditionSpecified Condition
2 (TBS) - 3 (TB5)Controller temperature 10°C (50°F)3.6 to 3.8 kohms
2 (TBS) - 3 (TB5)Controller temperature 25°C (77°F)1.9 to 2.1 kohms
2 (TBS) - 3 (TB5)Controller temperature 30°C (86°F)1.6 to 1.7 kohms

Fig. 93: Identifying Rear Wing Inner Heater RH Terminals
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
b. Measure the resistance between the terminals of the rear wing inner heater LH.
Standard:
TESTER CONNECTION AND SPECIFIED CONDITION
If the result is not as specified, replace the rear seat cushion heater ass
y LH.
Tester ConnectionConditionSpecified Condition
1 - 220°C (68°F)7.2 to 8.8 ohms

Fig. 94: Identifying Rear Wing Inner Heater LH Terminals
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
c. Measure the resistance between the terminals of the rear cushion heater LH.
Standard:
TESTER CONNECTION AND SPECIFIED CONDITION
Tester ConnectionConditionSpecified Condition
A1 - B120°C (68°F)4.2 to 5.1 ohms
C2 - C420°C (68°F)4.2 to 5.1 ohms
A2 - B2AlwaysBelow 1 ohms
C1 - C325°C (77°F)2 kohms

Fig. 95: Identifying Rear Seat Cushion Heater LH Connector Terminals
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
n.INSPECT REAR SEATBACK HEATER ASSY LH
a. Measure the resistance between the terminals of the rear seatback heater LH.
Standard:
TESTER CONNECTION AND SPECIFIED CONDITION
If the result is not as specified, replace the rear seatback heater assy LH.
Fig. 96: Identifying Rear Seatback Heater LH Connector Terminals

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
o.INSPECT REAR SEAT CUSHION HEATER ASSY RH
a. Measure the resistance between the terminals of the rear wing outer heater RH.
Tester ConnectionConditionSpecified Condition
A2 - A420°C (68°F)5.4 to 6.6 ohms
S60-4 - A220°C (68°F)5.4 to 6.6 ohms
S60-2 - A420°C (68°F)5.4 to 6.6 ohms
S60-1 - A1AlwaysBelow 1 ohms
S60-3 - A3AlwaysBelow 1 ohms

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

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
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

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
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

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
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

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
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)
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
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