2003 LEXUS LS430 seats

COMMUNICATION
1.GENERAL
The climate control seat system creates cold or warm air to increase the comfort of seats that have
become hot or cold.
The air is heated or cooled by the Peltier element on the back of the seat cushion pad and seatback. The
air is then sent to the seat cushion and seatback with the fan installed under the seat. The fan is operated
by pressing the climate control seat switch.
The climate control seat switch has several modes that vary the quantity of air to be sent to the seat. There
are 7 modes in total: 3 cooled air modes, 3 heated air modes and ventilation mode.
HINT:
When the highest level for cooled air operates for 15 minutes, the quantity of air falls 1 level.
2.FUNCTION OF MAIN COMPONENT
Fig. 4: Main Component Function Table

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3.SYSTEM OPERATION
SenderReceiverSignalLine
Climate control ECUECMIdle-up signalBEAN (Door bus), CAN

Fig. 25: Vehicle Overview
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Fig. 26: Front Seats

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Fig. 31: Front Seats
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Fig. 313: Removing Intake Valve Using SST
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HINT:
Arrange the valves, compression springs, spring seats and spring retainers in the correct order.
3.REMOVE EXHAUST VALVE
a. Using SST, compress the compression spring and remove the 2 keepers.
SST 09202-70020 (09202-00010)

Fig. 314: Removing Compression Spring And Removing Keepers Using SST
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b. Remove the spring retainer, compression spring, valve and spring seat.
HINT:
Arrange the valves, compression springs, spring seats and spring retainers in the correct order.
4.REMOVE VALVE STEM OIL O SEAL OR RING
a. Usin
g needle-nose pliers, remove the oil seal.

Fig. 350: Identifying Specification Clearance Using Reamer
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15.INSPECT INTAKE VALVE SEAT
a. Usin
g a 45° carbide cutter, resurface the valve seats. Remove only enough metal to clean the seats.

Fig. 353: Checking Seat Contact Surface (1 Of 2)
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If not, correct the intake valve seats as follows:
d. If the seating is too high on the valve face: Use 30° and 45° cutters to correct the seat.
e. If the seatin
g is too low on the valve face: Use 60° and 45° cutters to correct the seat.

Fig. 355: Cleaning Valve And Valve Seat
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16.INSPECT EXHAUST VALVE SEAT
a. Using a 45° carbide cutter, resurface the valve seats. Remove only enough metal to clean the seats.