Lexus ES: System Description
SYSTEM DESCRIPTION
HEATED STEERING WHEEL SYSTEM
(a) The heated steering wheel system heats the steering wheel assembly when the system is turned on using the steering wheel heater switch (refreshing seat switch) or steering wheel heater switch (multi-display assembly).
(b) The heated steering wheel system uses a thermistor inside of the steering wheel assembly to detect the heater temperature and maintain the set temperature.
(c) When the automatic steering wheel heater is set to on, the external and internal temperature is detected and an automatic judgment control heats the steering wheel automatically when the power switch is turned on (IG).
HEATER CONTROLLER SYSTEM
(a) Operation description
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(1) When the power switch is on (IG) and the system is turned on using the steering wheel heater switch (refreshing seat switch) or steering wheel heater switch (multi-display assembly), the indicator illuminates and the steering wheel heater control assembly supplies operating current to the steering wheel heater unit.
When the system is turned off using the steering wheel heater switch (refreshing seat switch) or steering wheel heater switch (multi-display assembly), the indicator turns off and the steering wheel heater control assembly stops supplying operating current to the steering wheel heater unit.
(2) A thermostat is installed in the steering wheel heater unit as a safety mechanism.
(3) Heated steering wheel controller (steering vibration ECU) has diagnosis function, refer to the fail-safe chart.
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(b) Signal input / output description
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| Signal | Signal Name | Function |
|---|---|---|
| Input | Thermistor input | Input of voltage corresponding to heater temperature |
| Input | Heater operation signal | Input of steering wheel heater operation signal |
| Output | Operation condition output | Outputs steering wheel heater operation condition. |
| Output | Operating current output | Outputs operating current of steering wheel heater unit. |
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How To Proceed With Troubleshooting
CAUTION / NOTICE / HINT HINT:
Use these procedures to troubleshoot the heated steering wheel system.
*: Use the Techstream.
PROCEDURE 1. VEHICLE BROUGHT TO WORKSHOP
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